INFORMATION LETTER 47-00-7

BELL 47G-3B-1 · Service Bulletins

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Overview

This document is an information letter issued by Bell Helicopter to provide recommended airworthiness limitations for the Bell 47 series helicopters. It consolidates various changes and updates to the airworthiness limitations schedule for different components of the aircraft.

The document serves as a reference for airworthiness limitations.
It includes limitations for main rotor, flight controls, tail rotor, powerplant, and transmission systems.
Operators should review applicable notes for additional limitations.
Airworthiness lives for components vary, with some on condition and others specified in hours.
The document covers multiple models including 47B, 47G, and 47G-3B-1.
It provides detailed part numbers for each component.
Some components have a shelf life in addition to operational hours.
The information is crucial for maintaining safety and compliance.

Document

Source

Originally published by scottsbell47.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

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Document details

Type: Service Bulletins
Year: 2000
File size: 175 KB
Publisher: scottsbell47.com
Language: en

About this document

What is the INFORMATION LETTER 47-00-7?

The INFORMATION LETTER 47-00-7 is a service bulletins for the BELL 47G-3B-1, dated 2000.

Where does the INFORMATION LETTER 47-00-7 come from?

This copy of the INFORMATION LETTER 47-00-7 was originally published by scottsbell47.com and is hosted on Sprinkle as a free, searchable reference copy.

What year was the INFORMATION LETTER 47-00-7 published?

The INFORMATION LETTER 47-00-7 — the BELL 47G-3B-1 service bulletins on file — is dated 2000.

Documentation completeness

2/7

Most owners only have the POH. Here's the essential set for the BELL 47G-3B-1.

Pilot's Operating Handbook / AFM
Checklist
Maintenance Manual
Parts Catalog (IPC)
Systems & Wiring
Service Bulletins on file
Type Certificate (TCDS)

More BELL 47G-3B-1manuals & documents

In this document

Airworthiness Limitations Overview

This section outlines the purpose of the document and emphasizes the importance of adhering to the recommended airworthiness limitations for safe operation.

Main Rotor System Limitations

Details the airworthiness lives of various main rotor components, including blades, gimbal rings, grips, and yokes, with specific part numbers and operational hours.

Flight Controls Limitations

Lists the limitations for flight control components, including bolts, pitch sleeves, and link rods, along with their respective part numbers.

Tail Rotor System Limitations

Describes the airworthiness limitations for tail rotor components, including yokes, blades, and drive shafts, specifying their operational hours.

Powerplant Limitations

Outlines the limitations for engine mounts and fan belts, including their operational hours and shelf life.

Transmission Limitations

Provides details on the limitations for shear screws and other transmission components, including their operational hours.

Safety notes

Operators must adhere to the specified airworthiness limitations to ensure safety.
Components listed as 'On Condition' require regular inspection and maintenance.
Certain components have specific operational hour limits that must not be exceeded.
Shelf life limitations apply to some parts, necessitating timely replacement.
Failure to comply with these limitations may result in safety hazards.

Full document text

A Subsidiary of Textron, Inc. August 11, 2000 Page 1 of 24 INFORMATION LETTER 47-00-7 TO: All Owners/Operators of Bell 47 Series Helicopters. SUBJECT: RECOMMENDED AIRWORTHINESS LIMITATIONS Numerous changes to the original Bell Helicopter 47 series airworthiness limitations schedule have been distributed by Bell Helicopter Service Instructions, Alert Service Bulletins, Technical Bulletins, or other Bell publications. This Information Letter is issued to provide one convenient reference document for current Bell Helicopter recommended airworthiness limitations for the listed components. Operators should review any applicable notes for additional airworthiness limitations and information. Page 2 of 24 INFORMATION LETTER 47-00-7 Table 1 – Airworthiness Limitations for 47B, B3, D, and D1 (Sheet 1 of 2) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade (Wood) 47-110-120-30, /-50 On Condition Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-135-2, /-3 and /–5 1200 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Hub Pillow Block 47-120-111-1 (30) Main Rotor Yoke (Al Alloy) (40) 300 hrs (8) Main Rotor Yoke (Al Alloy) (40) 600 hrs (9) Main Rotor Yoke (Steel) 47-120-177-1 3600 hrs (42 & 43) Main Rotor Drag Brace 47-110-133-1 (10) Main Rotor Drag Brace Fitting 47-110-145-2 (11) Main Rotor Blade Equalizer Horn 47-120-027-2 (11) Main Rotor Mast 47-130-100-1 50 hrs (33) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Pitch Sleeve Yoke 47-150-122-1 100 hrs (37) Collective Pitch Sleeve Yoke Lock 47-150-137-1 100 hrs (32) Collective Pitch Link Rod End Bearing RE4F7/RE4FL7 (34) Pitch Change Link 47-641-032-1 (12 & 13) Delta Hinge Bolt 47-641-031-1 (13) Delta Hinge Bearing KP5A OR K5A (13) Pitch Change Bearing 47-641-131-1 (13) Pitch Change Bearing 47-641-146 (R-4-AF4) (13) Pitch Change Bearing S1RP (13) Pitch Change Bearing 7R4AX1C (13) TAIL ROTOR SYSTEM Rotor Shaft 47-645-028-(ALL) (13 & 15) Rotor Shaft 47-645-051-(ALL) (13 & 15) Rotor Shaft 47-645-077-(ALL) (13 & 15) Tail Rotor Yoke 47-641-025-1 (13) Tail Rotor Yoke 47-641-057-1 (13) Tail Rotor Yoke 47-641-025-7, /-9 (13) Tail Rotor Yoke 47-641-057-7 (13) Tail Rotor Yoke 47-641-057-9 (13 & 16) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Page 3 of 24 INFORMATION LETTER 47-00-7 Table 1 – Airworthiness Limitations for 47B, B3, D, and D1 (Sheet 2) Nomenclature Part Number Airworthiness Life (1) TAIL ROTOR SYSTEM (cont’d) Tail Rotor Hub Retention Bolt 47-641-026-1 (13 & 35) Tail Rotor Hub Retention Bolt 47-641-194-1 (13) Tail Rotor Hub Retention Bolt 47-641-052-1 (13 & 31) Tail Rotor Hub Retention Bolt 47-641-052-3 (13) Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Universal Joint And Shaft 47-644-124-1 100 hrs (36) POWERPLANT Engine Mount 47-612-111-1, /-5 600 hrs (24) Engine Mount 47-612-131-1 2500 hrs Engine Mount 47-612-135-1 2500 hrs FAN BELT (Matched Sets) 47-661-026-1 100 hrs FAN BELT (Matched Sets) 47-661-028-1 100 hrs FAN BELT (Matched Sets) 47-661-041-1 through /–7 600 hrs FAN BELT (Matched Sets) 47-661-041-9 900 hrs/5 year shelf life (44) TRANSMISSION Fan Drive Bearing 47-620-605-1 (25) Shear Screw 47-620-485-1 600 hrs (26) Shear Screw 47-620-485-9 1200 hrs Ball Bearings, Spider Pinions (40) 50 or 100 hrs (27) Page 4 of 24 INFORMATION LETTER 47-00-7 Table 2 – Airworthiness Limitations for 47G (Sheet 1 of 2) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade (Wood) 47-110-120-30, /-50 On Condition Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-135-2, /-3 & /-5 1200 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 3600 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Pitch Link Rod End Bearing RE4F7/RE4FL7 (34) Pitch Change Link 47-641-032-1 (13) Delta Hinge Bolt 47-641-031-1 (13) Delta Hinge Bearing KP5A (13) Pitch Change Bearing 47-641-131-1 (13) Pitch Change Bearing 47-641-146 (R-4-AF4) (13) Pitch Change Bearing S1RP (13) Pitch Change Bearing 7R4AX1C (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-025-1 (13) Tail Rotor Yoke 47-641-057-1 (13) Tail Rotor Yoke 47-641-025-7, /-9 (13) Tail Rotor Yoke 47-641-057-7 (13) Tail Rotor Yoke 47-641-057-9 (13 & 16) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Hub Retention Bolt 47-641-052-1 (13, 31) Tail Rotor Hub Retention Bolt 47-641-052-3, /-5 (13, 14) Tail Rotor Hub Retention Bolt 47-641-194-1 (13) Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 &/-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) POWERPLANT Engine Mount 47-612-135-1 2500 hrs Fan Belts (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belts (Matched Sets) 47-661-041-9 900 hrs – 5 year shelf life (44) Fan Drive Bearing 47-620-605-1 (25) Page 5 of 24 INFORMATION LETTER 47-00-7 Table 2 – Airworthiness Limitations for 47G (Sheet 2) Nomenclature Part Number Airworthiness Life (1) TRANSMISSION Shear Screw 47-620-485-1 600 hrs (26) Shear Screw 47-620-485-9 1200 hrs Page 6 of 24 INFORMATION LETTER 47-00-7 Table 3 – Airworthiness Limitations for 47G-2 (Sheet 1 of 2) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM

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Main Rotor Blade (Wood) 47-110-120-30, /-50 On Condition Main Rotor Blade 47-110-250-9, /-13 & /-17 3000 hrs (3) Main Rotor Blade 47-110-250-15, /-19 3000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs (49) Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-135-2, /-3 & /-5 1200 hrs (5) Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Al Alloy) (40) 600 hrs (9) Main Rotor Yoke (Steel) 47-120-177-1 3600 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Pitch Link Rod End Bearing RE4F7/RE4FL7 (34) Collective Sleeve 47-150-117-13, /-21 5000 hrs (53) Pitch Change Bearing 47-641-146 (R-4-AF4) (13) Pitch Change Bearing S1RP (13) Pitch Change Bearing 7R4AX1C (13) Pitch Change Bearing 47-641-131-1 (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-025-1 (13) Tail Rotor Yoke 47-641-057-1 (13) Tail Rotor Yoke 47-641-025-7, /-9 (13) Tail Rotor Yoke 47-641-057-7 (13) Tail Rotor Yoke 47-641-057-9 (13 & 16) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Hub Retention Bolt 47-641-052-1 (13, 31) Tail Rotor Hub Retention Bolt 47-641-052-3, /-5 (13, 14) Tail Rotor Hub Retention Bolt 47-641-194-1 (13) Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Drive Shaft 47-644-234-3 (22) Page 7 of 24 INFORMATION LETTER 47-00-7 Table 3 – Airworthiness Limitations for 47G-2 (Sheet 2) Nomenclature Part Number Airworthiness Life (1) POWERPLANT Engine Mount 47-612-135-1 2500 hrs Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) Fan Drive Bearing 47-620-605-1 (25) TRANSMISSION Shear Screw 47-620-485-1 600 hrs (26) Shear Screw 47-620-485-9 1200 hrs Page 8 of 24 INFORMATION LETTER 47-00-7 Table 4 – Airworthiness Limitations for 47G-2A & 47G-2A-1 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-11 5000 hrs Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Blade 74-110-250-23 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 &/-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) Main Rotor Pitch Horn 47-120-126-5 5000 hrs FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 &/-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 9 of 24 INFORMATION LETTER 47-00-7 Table 5 – Airworthiness Limitations for 47G-3 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-11 5000 hrs Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 10 of 24 INFORMATION LETTER 47-00-7 Table 6 – Airworthiness Limitations for 47G-3B & 47G-3B-1 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-11 5000 hrs (45) Main Rotor Blade 47-110-250-21 5000 hrs (45) Main Rotor Blade 47-110-250-23 5000 hrs (46) Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Gimbal Ring 47-120-014-1 through /–21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 11 of 24 INFORMATION LETTER 47-00-7 Table 7 – Airworthiness Limitations for 47G-3B-2 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-23 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Drive Shaft 47-644-234-3 (22) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) Page 12 of 24 INFORMATION LETTER 47-00-7 Table 8 – Airworthiness Limitations for 47G-3B-2A (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-23 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-234-3 (22) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) Page 13 of 24 INFORMATION LETTER 47-00-7 Table 9 – Airworthiness Limitations for 47G-4 & 47G-4A (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-23 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Drive Shaft 47-644-234-3 (22 & 51) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs (47) Page 14 of 24 INFORMATION LETTER 47-00-7 Table 10 – Airworthiness Limitations for 47G-5 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 &/-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Drive Shaft 47-644-234-3 (22) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 15 of 24 INFORMATION LETTER 47-00-7 Table 11 – Airworthiness Limitations for 47G-5A (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Gimbal Ring 47-120-014-1 through -21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-234-3 (22) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 16 of 24 INFORMATION LETTER 47-00-7 Table 12 – Airworthiness Limitations for 47J (Sheet 1 of 2) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-401-(ALL) (2) Main Rotor Blade 47-110-250-11 5000 hrs Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Drag Brace 47-110-301-1 (2) Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 2500 hrs (42 & 43) Main Rotor Counterweight Bracket 47-110-287-9 200 hrs (29) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Pitch Link Rod End Bearing RE4FL7/RE4FL7 (34) Cyclic Bellcrank, Longitudinal 47-724-097-7, /-9 2500 hrs (41) Torque Tube, Lateral 47-725-852-1 1200 hrs (48) Collective Sleeve 47-150-117-5, /-13, /-21 5000 hrs Scissors Assembly 47-150-249-1, /-5, /-7 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Extension Tube 47-640-055-3 600 hrs (52) Page 17 of 24 INFORMATION LETTER 47-00-7 Table 12 – Airworthiness Limitations for 47J (Sheet 2) Nomenclature Part Number Airworthiness Life (1) POWERPLANT Engine Mount 47-612-135-147 (38) Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) Fan Drive Bearing 47-620-605-1 (25) TRANSMISSION Shear Screws 47-620-485-1 600 hrs Shear Screws 47-620-485-9 1200 hrs Page 18 of 24 INFORMATION LETTER 47-00-7 Table 13 – Airworthiness Limitations for 47J-2 & 47J-2A (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade 47-110-250-21 5000 hrs Main Rotor Blade 47-110-250-23 5000 hrs Main Rotor Pitch Horn 47-120-126-5 5000 hrs Main Rotor Drag Brace 47-110-372-1 2500 hrs Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-252-1, /-7 & /-11 1200 hrs (5 & 6) Main Rotor Grip 47-120-252-5 300 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 5000 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Sleeve 47-150-117-13, /-21 5000 hrs Scissors Assembly 47-150-249-5, /-7 5000 hrs Cyclic Bellcrank Longitudinal 47-724-097-9 5000 hrs Tail Rotor Pitch Change Shaft Bearing 47-640-069-1, /-3 (13) Tail Rotor Pitch Change Shaft Bearing S3K or S3S (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-104-5 (13 & 17) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) POWERPLANT Engine Mount 47-612-171-(ALL) 2500 hrs Fan Belt (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belt (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) TRANSMISSION Shear Screw 47-620-485-9 1200 hrs Page 19 of 24 INFORMATION LETTER 47-00-7 Table 14 – Airworthiness Limitations for 47H-1 (Sheet 1 of 1) Nomenclature Part Number Airworthiness Life (1) MAIN ROTOR SYSTEM Main Rotor Blade (Wood) 47-110-120-30, /-50 On Condition Main Rotor Gimbal Ring 47-120-014-1 through /-21 (4) Main Rotor Gimbal Ring 47-120-014-23 4800 hrs Main Rotor Grip 47-120-135-2, /-3 & /-5 1200 hrs (5) Main Rotor Hub Core 47-120-117-1 (7) Main Rotor Yoke (Steel) 47-120-177-1 3600 hrs (42 & 43) FLIGHT CONTROLS Main Rotor Flight Control Bolts (40) (23) Collective Pitch Link Rod End Bearing RE4F7/RE4FL7 (34) Tail Rotor Pitch Change Bearing R4AF4 (47-641-146) (13) Tail Rotor Pitch Change Bearing S1RP (13) Tail Rotor Pitch Change Bearing 7R4AX1C (13) TAIL ROTOR SYSTEM Tail Rotor Yoke 47-641-057-7 (13) Tail Rotor Yoke 47-641-057-9 (13 & 16) Tail Rotor Yoke 47-641-126-5 2500 hrs Tail Rotor Blade 47-642-102-(ALL) (13, 18 & 28) Tail Rotor Blade 47-642-117-1, /-105 2500 hrs Tail Rotor Hub Retention Bolts 47-641-052-1 (13, 31) Tail Rotor Hub Retention Bolts 47-641-052-3, /-5 (13 & 14) Tail Rotor Drive Shaft 47-644-172-3 (21) Tail Rotor Drive Shaft 47-644-180-1, /-5 (21) Tail Rotor Drive Shaft 47-644-186-1 (21) Tail Rotor Drive Shaft 47-644-187-1, /-5 & /-11 (21) Tail Rotor Drive Shaft 47-644-214-1 (21) Tail Rotor Hub Retention Bolt 47-641-194-1 (13) POWERPLANT Engine Mount 47-612-135-63 1200 hrs (39) Fan Belts (Matched Sets) 47-661-028-1 100 hrs Fan Belts (Matched Sets) 47-661-041-1 through /-7 600 hrs Fan Belts (Matched Sets) 47-661-041-9 900 hrs - 5 year shelf life (44) Fan Drive Bearing 47-620-605-1 (25) TRANSMISSION Shear Screw 47-620-485-1 600 hrs Shear Screw 47-620-485-9 1200 hrs Page 20 of 24 INFORMATION LETTER 47-00-7 NOTES The notes that follow apply to TABLES 1 through 14 of this Alert Service Bulletin. 1. The airworthiness limitation for the part number listed applies to all successive dash numbers for that component unless otherwise specified. The operating time specified for retirement for any given part number contained in this Retirement Schedule applies to all successive dash numbers for that item unless otherwise specified. Retirement lives assigned to helicopter components and assemblies are based upon experience, testing and engineering judgment, and the configuration of the helicopter at the time of delivery. They are subject to change at the sole discretion of Bell Helicopter Textron or an appropriate government agency. 2. Remove these blades from service on 47J or any other helicopter (unauthorized use) that may have this blade installed. Refer to SB 47-04-1-74-1, dated 9-20-74. Service Instruction (SI) 316 introduced metal blades and required that drag brace 47-110-301-(ALL) be removed from service. 3. Increase in life of the short metal blade from 2500 to 3000 hours. Refer to SL 112 Revision A, dated 1-29-58 and AD 56-20-03. 4. Removal from service no later than 1 September 1976 of main rotor gimbal rings 47-120-014-5, /-6, /-7, /-9, /-11, /-13, /-15, /-17, /-19 and /-21. Refer to SB 47-76-4, dated 4-5-76. 5. Retirement of grips 47-120-135-2, /-3, /-5 and 47-120-252-1, /-7, /-11 after 1200 hours; retirement of grip 47-120-252-5 after 300 hours. Refer to ASB 47-85-12 Revision A, dated 3-13-86. Refer to Federal Aviation Authority (FAA) Airworthiness Directive (AD) 86-06-08 or Transport Canada Aviation (TCA) Airworthiness Directive (AD) CF-88-08. 6. Mandatory removal from service immediately of main rotor grip 47-120-252-11 with selected s/n listed in bulletin. Refer to ASB 47-89-15 Revision A, dated 8-29-89 and AD 91-20-10. 7. Recurring 100 hr inspection of thin web cores 47-120-117-1 that have accumulated 1200 hrs in service. Refer to SB 47-04-1-73-2, dated 5-3-73. Page 21 of 24 INFORMATION LETTER 47-00-7 8. When used with 200 hp engine. 9. When used with 178 hp engine. 10. Mandatory removal from service of drag brace 47-110-133-1 installed on 47B and 47B3. Replace with drag brace 47-110146-2 (50). Refer to SB 31, dated 9-8-47 and FAA AD 48-11-05. 11. Mandatory removal from service no later than 1 March 1952. Refer to SB 77, dated 11-2-51 and FAA AD 52-01-02. 12. Mandatory replacement with pitch links 47-641-070-1, 47-641-107-1 or 47-641- 154-1. Refer to SB 97 rev. C, dated 4-19-57 and AD 55-05-01. 13. Mandatory installation of tail rotor hub and blade assembly 47-641-170. Refer to ASB 47-79-4 Rev B, dated 2-4-81 and AD 80-10-04. 14. Mandatory removal from service of T/R hub bolts 47-641-052-3, /–5 and seals 47-641-042-1, no later than Feb. 15, 1976. Refer to SB 47-76-1, dated 1-5-76 and AD 76-12-01. 15. Mandatory removal of shaft 47-645-028-1, 47-645-051-1 & 47-645-077-1 at 900 hrs of operation. Until part reaches 900 hours in service a mandatory 100 hr inspection of bolt hole for elongation or cracks is required. Refer to SB 83 Revision C, dated 2-19-53 and AD 51-29-01, AD 52-28-03. 16. Mandatory removal from service of limited s/n effectivity for 47-641-057-9 TR yokes only. Refer to SB 47-05-73-1 Revision A, dated 11-18-75 and AD 76-12-02. Superseded by ASB 47-79-4 Revision B, dated 2-4-81. 17. Applies to tail rotor yokes S/N I29-642 through I29-689 as used on 47G2-A, 47G3 & 47G3-B only. Affected parts to be sent to BHT for inspection and reprocessing. Refer to SB 138, dated 8/24/62. Superseded by ASB 47-79-4 Revision B, dated 2-4-81. 18. Airworthiness life reduced to 300 hours. Refer to ASB 47-79-3, dated 12-4-79 and AD 80-10-04. 19. Replacement of tail rotor blade assembly 47-642-117-1 S/N A-8 through A-72. Refer to ASB 47-84-11, dated 10-16-84. Page 22 of 24 INFORMATION LETTER 47-00-7 20. Mandatory replacement of tail rotor blade assembly, P/N 47-642-117-105, serial numbers A-1943 through A-2068. Refer to ASB 47-96-21, dated 1-29-96 and AD 96-06-12. 21. Mandatory removal from service no later than 1 March, 1971. Refer to SB 145 Revision C, dated 12-22-70 and AD 78-08-02. 22. Mandatory removal from service no later than 1 March 85. Replaced by 47-644- 234-101. Refer to ASB 47-84-10 Revision A, dated 7-16-84. 23. Calendar inspection each 24 months imposed on main rotor flight control bolts. Refer to ASB 47-89-16, dated 8-02-89. 24. Daily inspection, of engine mount assemblies 47-612-111-1 or /-5, for cracks, and airworthiness life reduced to 600 hrs. Refer to SB 74, Rev. E dated 4-21-54 and AD 51-27-01. 25. Mandatory removal from service of bearing 47-620-605-1 no later than 1 Dec 1980. Refer to ASB 47-80-6, dated 5-15-80 and AD 81-04-03. Replaced by bearing 47-620-929-001. 26. Mandatory replacement before accumulating 600 hrs. Refer to SB 66, dated 2-18- 48 and AD 48-12-05. 27. Mandatory removal from service at 100 hours of operation if SB 47C37 and 47C39 are completed (50 hrs if not completed). Refer to SB 47C4, dated 2-23-48 and AD 47-51-11. 28. Mandatory replacement of tail rotor blades and/or blade sets P/N 47-642-102-7, /-9, /-19, /-27, /-29, /-33, /-39, /-39, /-41, /-45, /-51, /-53, /-57, /-63, /-65, /-69, /-75, /-77 and /-81. Refer to ASB 47-76-2, dated 2-13-76 and AD 80-10-04. 29. Mandatory one-time replacement of main rotor counterweight bracket 47-110-287-9 at 200 hours. The new bracket assemblies are on-condition. Refer to SB 127 Revision B, dated 5-20-59 and AD 58-17-01. 30. Mandatory replacement of pillow blocks 47-120-111-1 by 47-120-111-5, prior to next flight. Refer to SB 45, dated 5-27-47 and AD 47-32-06. Page 23 of 24 INFORMATION LETTER 47-00-7 31. Mandatory replacement of tail rotor hub retention bolts, P/N 47-641-052-1. Refer to SB 112 Revision A, dated 1-29-58 and AD 56-20-03. Superseded by ASB 47-79- 4 Revision B, dated 2-4-81. 32. Replacement of collective pitch yoke locknut 47-150-137-1 with locknut 47-150- 137-3 before 1 June, 1952. Refer to SB 88, dated 4-17-52. 33. Mandatory replacement of main rotor mast assembly 47-130-100-1 with mast assembly 47-130-100-2. Refer to SB 24, dated 6-26-47 and AD 47-32-10. 34. Mandatory replacement of collective pitch link rod end bearings RE4F7 & REFL7 with bearings 47-140-252-1 before 1 March 1962. Refer to SB 137, dated 12-1-61 and AD 61-22-01. 35. Mandatory replacement of tail rotor blade grip retaining screw no later than 1 March 1952. Refer to SB 80, dated 11-2-51 and AD 52-01-05. 36. Replace tail rotor drive rear universal joint and shaft assembly that do not have a grease nipple. Refer to SB 54, dated 7-16-47. 37. Replacement of collective pitch sleeve yoke 47-150-122-1 with yoke 47-150-122-2. Refer to SB 6, dated 3-3-47. 38. Engine mount retirement life is 2500 hours if helicopter is operated at 2565 pounds maximum gross weight and 600 hours if helicopter is operated at 2800 to 2850 pounds maximum gross weight. Engine mount which has been operated at 2565 pounds maximum gross weight for less than 900 hours can continue in service after installation of 2850 pounds gross weight kit, for not more than 600 hours provided total time in service does not exceed 900 hours. Refer to S. I. 316 Revision J, dated 3-12-65. 39. A Magnetic Particle Inspection (MPI) is required every 400 hours of operation. 40. The part number was not shown in original publications. 41. The airworthiness life is 2500 hours if the bellcrank was used at any time with wood blades and 5000 hours if the bellcrank was used only with metal blades. Page 24 of 24 INFORMATION LETTER 47-00-7 42. The airworthiness life of the main rotor yoke is 3600 hours if the main rotor yoke was used at any time with wood blades on any Bell 47 except the Bell 47J, and 5000 hours if the main rotor yoke was used only with metal blades. 43. The airworthiness life of the main rotor yoke is 2500 hours if the main rotor yoke was used at any time with wood blades on the Bell 47J, and 5000 hours if the main rotor yoke was used only with metal blades. 44. Bell Helicopter recommends applying a five year life to parts in shelf stock while in storage. Fan belts in active service are only subjected to the 900 hours life. 45. Authorized for use on model 47G-3B only. 46. Authorized for use on model 47G-3B-1 only. 47. Authorized for use on model 47G-4 only. 48. Lateral torque tube 47-725-852-1 is on-condition. 49. Drag brace 47-110-372-1 is used with metal blades only. Drag brace 47-110-236-(ALL), which is used only with wood blades, is on-condition. 50. Left-hand thread fitting 47-110-145-2 must be removed from service. Refer to S. B. 77, dated 11-2-51. 51. Authorized for use on model 47G-4A only. 52. Tail rotor extension tube 47-640-055-5 is on-condition. 53. The airworthiness life is 5000 hours if the collective sleeve was used at any time with metal blades and on-condition if the collective sleeve was used only with wood blades.

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