SERVICE BULLETIN - KSB-117-442
KAWASAKI BK117 · Service Bulletins
Overview
This document is a service bulletin for the Kawasaki BK117 helicopter, specifically addressing the change of inspection intervals for the main rotor blade thimble. It outlines mandatory inspection procedures and compliance requirements for affected helicopters and parts.
- Mandatory inspection intervals for main rotor blade thimbles have been reduced.
- Initial and repetitive inspections are required for specific blade configurations.
- Main rotor blades with sweep angle 1° require inspections every 100 flight hours.
- Main rotor blades with sweep angle 0° require inspections every 300 flight hours.
- No special tools or parts are required for the inspection.
- Logbook entries must be made after inspections.
- The bulletin is approved by JCAB.
- Approximately 1 man-hour is needed for the inspection process.
Document
Source
Originally published by bk117.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2018
- File size ·
- 581 KB
- Publisher ·
- bk117.com
- Language ·
- en
Specifications & performance
Extracted from this document.
Specifications
- Main rotor blade sweep angle 0 part numbers ·
- 117-151371, 117-151371V001, 117-151501
- Main rotor blade sweep angle 1 part numbers ·
- 117-150071, 117-150081, 117-151311, 117-151331
- Main rotor blade with vibration absorber part numbers ·
- 117-151421V001, 117-151441, 117-151441V001, 117-151451, 117-151451V001, 117-151511, 117-151521
What is the SERVICE BULLETIN - KSB-117-442?
The SERVICE BULLETIN - KSB-117-442 is a service bulletins for the KAWASAKI BK117, dated 2018.
Where does the SERVICE BULLETIN - KSB-117-442 come from?
This copy of the SERVICE BULLETIN - KSB-117-442 was originally published by bk117.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the SERVICE BULLETIN - KSB-117-442 published?
The SERVICE BULLETIN - KSB-117-442 — the KAWASAKI BK117 service bulletins on file — is dated 2018.
Most owners only have the POH. Here's the essential set for the KAWASAKI BK117.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
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In this document
Effectivity
The bulletin affects all Kawasaki BK117 models including A-3, A-4, B-1, B-2, and C-1 with specific part numbers for main rotor blades.
Purpose
The purpose is to prescribe new inspection intervals for the blade thimble based on analysis results.
Compliance
Initial inspections must be completed even if previous inspections were done according to the maintenance manuals.
Accomplishment Instructions
Instructions detail how to determine initial inspection times and conduct inspections for both installed and spare main rotor blades.
JCAB Approval
The service bulletin has been approved by the Japan Civil Aviation Bureau (JCAB).
Weight and Balance Change
There are no changes to weight and balance as a result of this service bulletin.
Full document text
DATE : 2018-04-27 SERVICE BULLETIN KSB-117-442 Kawasaki BK117 1 / 8 TITLE : Main Rotor Blade - Change of Inspection Interval for Blade Thimble 1. EFFECTIVITY (1) Helicopters Affected: Model Mfg. Serial No. KAWASAKI-BK117, BK117 A-3, BK117 A-4, BK117 B-1, BK117 B-2, BK117 C-1 All (2) Parts Affected: Part No. Part Name Remarks 117-150071 117-150081 117-151311 117-151331 Main Rotor Blade (Blade Sweep Angle 1°) All corresponding S/N up to 4729, including spare parts. 117-151371 117-151371V001 117-151501 Main Rotor Blade (Blade Sweep Angle 0°) All corresponding S/N up to 4729, including spare parts. 117-151421V001 117-151441 117-151441V001 117-151451 117-151451V001 117-151511 117-151521 Main Rotor Blade with Vibration Absorber, Blade Sweep Angle 0° All corresponding S/N up to 4729, including spare parts. KSB-117-442 2 / 8 2. PURPOSE AHD reported that, due to the test results of an analysis of the blade root area, the inspection intervals of the blade thimble for corresponding main rotor blades in the MAINTENANCE MANUALs were reduced. This Service Bulletin prescribes an initial inspection and repetitive inspections of the blade thimble until the new inspection intervals are reflected in the MAINTENANCE MANUALs and the latest KSB-117-192. 3. C ATEGORY MANDATORY 4. COM PLIANCE NOTE Even if the initial inspection (for new blades) prescribed in the MAINTENANCE MANUAL and the latest KSB-117-192 are completed, the initial inspection of the blade thimble prescribed by this Service Bulletin must be accomplished. (1) Equipment Installed on Helicopters: a． Main rotor blades with sweep angle 1° (a) Determination of the initial inspection time: After receiving this Service Bulletin, the determination of the initial inspection time must be accomplished promptly in accordance with Section 9.(1) a of this Service Bulletin. (b) Initial inspection: Accomplish the inspection of the blade thimble in accordance with Section 9.(1) b. by the inspection time determined in accordance with Section 4.(1) a.(a) of this Service Bulletin. (c) Repetitive inspections: After accomplishing the inspection in accordance with 4.(1) a.(b) of this Service Bulletin, repeat the inspection of the blade thimble every 100 Fh (tolerance of 10 Fh) in accordance with Section 9.(1) b. KSB-117-442 3 / 8 b． Main rotor blades with sweep angle 0° (a) Determination of the initial inspection time: After receiving this Service Bulletin, the determination of the initial inspection time must be accomplished promptly in accordance with Section 9.(1) a of this Service Bulletin. (b) Initial inspection: Accomplish the inspection of the blade thimble in accordance with Section 9.(1) b. by the inspection time determined in accordance with Section 4.(1) b.(a) of this Service Bulletin. (c) Repetitive inspections: After accomplishing the inspection in accordance with 4.(1) b.(b) of this Service Bulletin, repeat the inspection of the blade thimble every 300 Fh (tolerance of 30 Fh) in accordance with Section 9.(1) b. (2) Spare Parts: After receiving this Service Bulletin and before installation of the main rotor blades on the helicopter, check the necessity for the inspection of the blade thimble in accordance with Section 9.(2) a of this Service Bulletin. 5. JC AB APPROVAL Approved by JCAB. 6. LOG BOOK ENTRY (1) For equipment installed on helicopters, make an entry in the Aircraft Logbook and on the Main Rotor Blade Log Card stating that work has been accomplished in accordance with KSB-117-442 (ASB MBB-BK117-10A-137). (2) For spare parts, make an entry on the Main Rotor Blade Log Card stating that work has been accomplished in accordance with KSB-117-442 (ASB MBB-BK117-10A-137). 7. M AN-HOUR REQUIRED Approximately 1 man-hour (for reference only) will be required. (Not including inspection of the blade thimble) 8. WEIGHT AND B AL ANCE CH ANGE None. KSB-117-442 4 / 8 9. ACCOM PLISHMENT INSTRUCTI ONS (1) Main Rotor Blades Installed on Helicopters a． Determination of the initial inspection time: (a) Determine the flight hours (Fh) of the main rotor blade from: the Fh since installation of the main rotor blade on the helicopter, or the Fh since the previous inspection of the blade thimble or the previous inspection of lead-lag amounts and unbalance amounts (for main rotor blades with sweep angle 1° only). (b) Use the Main Rotor Blade Log Card and blade part number to determine whether the configuration of the main rotor blade is blade sweep angle 1° or 0°. (c) If the configuration of main rotor blade is sweep angle 1° and KSB-117-192 has not been accomplished, use the flow chart in Figure 1 to determine the Fh until the initial inspection of the blade thimble. NOTE Blades with sweep angle 1° can be modified to blades with sweep angle 0° by accomplishing KSB-117-192 “Modification and Inspection of Main Rotor Blades.” (d) If the configuration of main rotor blade is sweep angle 0°, use the flow chart in Figure 2 to determine the Fh until the initial inspection of the blade thimble. (e) Complete determination work of this Service Bulletin by making an entry in the Aircraft Logbook and on the Main Rotor Blade Log Card stating that the Fh until the initial inspection of the blade thimble has been determined in accordance with Section 9.(1).a.(c) (for sweep angle 1°) or 9.(1).a.(d) (for sweep angle 0°), and determination of the initial inspection time has been accomplished in accordance with Service Bulletin KSB-117-442 (ASB MBB-BK117-10A-137) . b． Inspection of blade thimble: (a) Set-up: 1. Remove the main rotor blade from the helicopter (MAINTENANCE MANUAL [hereafter, “MM”], section 14-6). 2. Disassemble the blade fittings (MM, section 14-10). (b) Inspection: Inspect the blade thimble and the surrounding components (MM section 14-5.6.(2) ~ (3) and 14-11). (c) Close up: 1. Assemble the blade fittings (MM, section 14-12). 2. Install the main rotor blade on the helicopter (MM, section 14-6). 3. Conduct tracking and balancing for the main rotor (MM, appendix 3).
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KSB-117-442 5 / 8 (d) Completion of work: Complete inspection work of this Service Bulletin by making an entry in the Aircraft Logbook and on the Main Rotor Blade Log Card stating that work has been accomplished in accordance with KSB-117-442 (ASB MBB-BK117-10A-137). (2) Spare Parts a． Determination of inspection necessity: In the following procedure, refer to the Main Rotor Blade Log Card to check the blade thimble inspection history and the Fh since the previous blade thimble inspection or the previous inspection of lead-lag amounts and unbalance amounts (for main rotor blades with sweep angle 1° only). (a) If one of the following conditions apply, it is not necessary to inspect the blade thimble before installing the blade on a helicopter. Complete work in accordance with section 9.(2)b.(d) of this Service Bulletin: ・The blade is new ・The Fh since the previous inspection of the blade thimble or the previous inspection of lead-lag amounts and unbalance amounts (for main rotor blades with sweep angle 1° only) is 0 Fh (b) If one of the following conditions apply, inspect the blade thimble in accordance with section 9.(2) b. of this Service Bulletin before installing the blade on a helicopter: ・The blade is not new and the blade thimble has not been inspected even once ・The Fh since the previous inspection of the blade thimble or the previous inspection of lead-lag amounts and unbalance amounts (for main rotor blades with sweep angle 1° only) is not 0 Fh. b． Inspection of blade thimble: (a) Set-up: Disassemble the blade fittings (MM, section 14-10). (b) Inspection: Inspect the blade thimble and the surrounding components (MM section 14-5.6.(2) ~ (3) and 14-11). (c) Close up: Assemble the blade fittings (MM, section 14-12). (d) Completion of work: Complete inspection work of this Service Bulletin by making an entry on the Main Rotor Blade Log Card stating that work has been accomplished in accordance with KSB-117-442 (ASB MBB-BK117-10A-137). KSB-117-442 6 / 8 10. PARTS AND M ATERIAL INFORM ATION (1) Required Parts for One Helicopter None. (2) Required Materials for One Helicopter None. (3) Parts to be Removed None. 11. SPECIAL TOOL S REQUIRED Not required. 12. REFERENCE TECHNIC AL D ATA KAWASAKI BK117 MAINTENANCE MANUAL KAWASAKI BK117C MAINTENANCE MANUAL Service Bulletin KSB-117-192 “Modification and Inspection of Main Rotor Blades” Prepared by: KAWASAKI HEAVY INDUSTRIES, LTD. AEROSPACE SYSTEMS COMPANY Kawasaki cho 1, Kakamigahara City, Gifu Prefecture, 504 -8710, Japan KSB-117-442 7 / 8 Figure 1 Determination of Initial Inspection Time (Blade with Sweep Angle 1°) KSB-117-442 8 / 8 Figure 2 Determination of Initial Inspection Time (Blade with Sweep Angle 0°)