SERVICE INFORMATION LETTERS
AIR TRACTOR AT-400A · Service Bulletins
Overview
This document is a service information bulletin for the Air Tractor AT-400A aircraft, detailing various service letters applicable to multiple models. It includes information on modifications, maintenance procedures, and safety notices relevant to the aircraft's operation and maintenance.
- Applicable to multiple Air Tractor models including 400A and 802.
- Includes service letters on flap actuator travel, hopper systems, and engine modifications.
- Addresses safety concerns such as hydraulic leaks and structural cracks.
- Provides retrofit instructions for various components.
- Contains information on converting configurations for different regions.
- Highlights the importance of regular inspections and maintenance.
- Includes updates on performance data for specific engine models.
- Lists service letters that are not applicable to certain models.
Document
Source
Originally published by airtractor.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2017
- File size ·
- 101 KB
- Publisher ·
- airtractor.com
- Language ·
- en
What is the SERVICE INFORMATION LETTERS?
The SERVICE INFORMATION LETTERS is a service bulletins for the AIR TRACTOR AT-400A, dated 2017.
Where does the SERVICE INFORMATION LETTERS come from?
This copy of the SERVICE INFORMATION LETTERS was originally published by airtractor.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the SERVICE INFORMATION LETTERS published?
The SERVICE INFORMATION LETTERS — the AIR TRACTOR AT-400A service bulletins on file — is dated 2017.
Most owners only have the POH. Here's the essential set for the AIR TRACTOR AT-400A.
- 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
Applicability
The bulletin applies to various Air Tractor models including 300, 400, 500, 600, and 800 series.
Service Information Letters
A list of service letters detailing specific issues and modifications for the aircraft, including flap actuator instructions and hopper systems.
Safety Notices
Warnings regarding potential issues such as hydraulic leaks, structural cracks, and operational behavior at full flaps.
Modifications
Instructions for retrofitting components and converting aircraft configurations for different operational needs.
Performance Information
Updates on performance data related to engine models, particularly the PT6A series.
Inspection Recommendations
Emphasizes the need for regular inspections to ensure safety and operational integrity.
Safety notes
- Hydraulic oil leaks may occur when the system is shut down.
- Cracks in lower flap bay wing skin may affect structural integrity.
- Excess grease pressure may cause tail wheel fork to drop out of housing in flight.
- Stick oscillations can occur in rough air.
- Flap actuator malfunctions can lead to operational issues.
- Hopper leaks can compromise performance.
Full document text
SNOW ENGINEERING CO. ENGINEERING NUMBER 02 Wichita Falls, Texas REPORT ORDER MODEL All TITLE BY CHK'D SERVICE INFORMATION Leland Snow SERIAL All LETTER INDEX DATE *6/21/17 PAGE 1 OF *5 * APPLICABILITY 300 302 400 401 402 501 502 602 802 S/L 301 302A 400A 401B 402A 502A 802A No. SUBJECT 402B 502B 503A 401/402 SERVICE INFORMATION LETTERS 0001 Flap Actuator Travel Limit Mircro Switches X X X X 0002 Hopper Rinse Spray Ball X X X X 0003 Converting to Argentine Configuration X 0004 Flap Actuator Retrofit Instructions (1023-1036) X X 0005 Hopper Fill Vent (thru 1090) X X 0006 Converting to Brazilian Configuration X 0007 New Oil Cooler Ejector System Door Stop X 0008 Quick Change Air Filter Kit (0244-1055) X X 0009 Not for Gen. Distrib.-Converting to Arg. Configuration X 0010 Wet Line instrument Connections X X X 0011 Retrofit of Enlarged Access Panel in AT-401/402 Lower Aft Enclosure Skins X X 502 SERVICE INFORMATION LETTERS 0001 Door Closing Handle X 0002 Flap Actuator Travel Limit Micro Switches X 0003 Air Conditioner Operation X 0004 Hopper Rinse Spray Ball X 0005 Not Applicable. 0006 Converting to Argentine Configuration X 0007 Flap Actuator Retrofit Instructions (0411-0455) X 0008 Hopper Fill Vent (thru 0531) X 0009 New Oil Cooler Ejector System Door Stop X 0010 Quick Change Air Filter Kit (thru 0491) X 0011 Wet Line Instrument Connections X 0012 Retrofit of Enlarged Access Panel in AT-502 Lower Aft Enclosure Skins X 602 SERVICE INFORMATION LETTERS 0001 Hopper Vent Tube X 0002 Engine Air Filter Box X 0003 Aft Belly Skin Cracks (0337-0441) X 0004 Flap Actuator Malfunction X 0005 Tail-wheel Lock-Pin Housing Screws (0001-0505) X 0006 Mechanical Hopper Gauge X 0007 Hopper Fill Vent (thru 0521) X 0008 Quarter Turn Fastener Interference(0337-0549) X 0009 PT6A-65AG Fuel Nozzle Inspection X 0010 Quick Change Air Filter Kit (0337-0444) X 0011 Wet Line Instrument Connections X * Indicates Revision SNOW ENGINEERING CO. ENGINEERING NUMBER 02 Wichita Falls, Texas REPORT ORDER MODEL All TITLE BY CHK'D SERVICE INFORMATION Leland Snow SERIAL All LETTER INDEX DATE 2/14/00 PAGE 2 OF APPLICABILITY 300 302 400 401 402 501 502 602 802 S/L 301 302A 400A 401B 402A 502A 802A No. SUBJECT 402B 502B 503A 802 SERVICE INFORMATION LETTERS 1 Not Applicable. 2 Not Applicable. 3 Not Applicable. 4 Cracks in lower flap bay wing skin at rib X 5 Oil Cooler not large enough X 6 Hydraulic oil leaks out of tank when system is X shut down(Air tankers with computer fire gate) 7 Heavy Ailerons X 8 Dragging Brakes X 9 Fuel exits tank vent line during manueuvers X 10 Tail gear spring might break X 11 L/H fuel tank feeds faster than R/H fuel tank X 12 Excess grease pressure may cause tail wheel X fork to drop out of housing in flight 12A Excess grease pressure in tail wheel housing X may fail bolt through fork and steering cap 13 Hopper leak between hopper flange & adapter box X 14 Hopper leaks around the lower internal brace .... X 15 Skin Cracks in fuselage removable panels X 16 Cracks in long belly skin above center boom X 17 Slack in tail wheel fork due to wear of upper X 18 Hot section monitoring on PT6A-65 & 67 series X 19 Tail wheel lock pin spring X 20 Stick oscillations in rough air X 21 Flap actuator malfunction X 21A Flap actuator malfunction X 22 Generator airscoop on R/H engine cowl X 23 Hopper overfill protection valve X 24 Tail wheel fork bushing X 25 Cracking in aft hopper rear wall X 26 Aileron pushrods under cockpit X 27 Foam tank sender X 28 Improved grommet for side skins X 29 Engine cowl cracks X 30 Aileron pushrod X 31 Flap rub in wing shroud X 32 Tail wheel shimmy X 33 ITT Starting temps -- 67AG X 34 Horizontal stabilizer attach bolts X SNOW ENGINEERING CO. ENGINEERING NUMBER 02 Wichita Falls, Texas REPORT ORDER MODEL All TITLE BY CHK'D SERVICE INFORMATION Leland Snow SERIAL All LETTER INDEX DATE *5/2/07 PAGE 3 OF APPLICABILITY 300 302 400 401 402 501 502 602 802 S/L 301 302A 400A 401B 402A 502A 802A No. SUBJECT 402B 502B 503A 802 SERVICE INFORMATION LETTERS CONT. 35 Cherry Rivets Loosening in Service X 36 Hopper Rinse Spray Ball X 37 Clear Anti-Abrasive Tape X 38 Exhaust Pipes X 39 Proximity Sensor X 40 Not Applicable X 41 Not Applicable X 41A Not Applicable X 42 Hopper Quantity Gauge in Ag Models X 43 Elevator Trim X 44 Spray Booms for Lateral Support X 45 Additional Support for Hopper Adapter X 46 Optional Air Filter (Thru 0059) X 47 Wood Support - Aft Hopper (Thru 0057) X 48 Bronze Bushings/Trim Tab or Boost Tab Sys. X 49 Simex Tires X 50 Flap Actuator X 51 Aft Turtle Deck Skin Attach Screws X 52 Cracks In Lower Hopper Corners X 53 Not Applicable X 54 FCU Manual Override Kit X 55 Tail-Wheel Lock-Pin Housing Screws (0001-0067) X 56 Engine Mount Vibration Isolators X 57 Propeller Governor X 58 Mechanical Hopper Gauge (0001-0059) X 58A Mechanical Hopper Gauge-802A (0001-0091) X 59 Hopper Fill Vent (0001-0073) X 60 Not Applicable X 61 Not Applicable X 62 Aileron Centering Springs (0001-0079) X 63 Rudder Cable Wear (0001-0081) X 64 Not Applicable X 65 PT6A-65AG Fuel Nozzle Inspection X 66 Quick Change Air Filter Kit (0001-0061) X 67 Not Applicable X 68 Not Applicable X 69 Not Applicable X 70 Elevator Hinge Clearance X SNOW ENGINEERING CO. ENGINEERING NUMBER 02 Wichita Falls, Texas REPORT ORDER MODEL All TITLE BY CHK'D SERVICE INFORMATION Leland Snow SERIAL All LETTER INDEX DATE *12/30/19 PAGE 4 OF APPLICABILITY 300 302 400 401 402 501 502 602 802 S/L 301 302A 400A 401B 402A 502A 802A No. SUBJECT 402B 502B 503A 802 SERVICE INFORMATION LETTERS CONT. 71 Bottom Load Valve - 81988 Detent Lever Instl. X 72 Not Applicable X 73 Undamped Oscillations About the Pitch Axis X 74 Not Applicable X
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75 Wet Line Instrument Connections X 76 AT-802/802A Supplemental Performance Info X 77 PLC Spare Fuses X 78 Improved Hubcap and Grease Seal for 40-279/40-279A Wheel Assemblies X 79 Low Power Supply Connector Upgrade X 80 Encoder Upgrade Installation X 81 Hydraulic Pump and Cooling Kit Installation X 82 Year 2006 FRDS Upgrades and Modifications X 83 Shock Resistant Cradle for the PLC X 84 Preventing Damage from Ice to the Fire Gate X 85 Preventing Corrosion on the FRDS Shaft Support Plates X 86 Blower to Cool Hyd. Motor & Pump on Ground for FRDS 802s X 87 Install of Lightning-Safe Features in the Field X 88 Field Retrofit of p/n 83224-1 Hydreco Pump X and Marathon DC Motor on AC with FRDS Install. 89 Field Retrofit of p/n 83224-1 Hydreco Pump X and Marathon DC Motor on AC with FRDS Install. 90 Elevator Square Trailing Edge Modification X 91 Field Inspection & Corrective Action of the FRDS X Actuator installation for Gen I & Gen II FRDS 92 Gatebox Fairing for AT-802AG X 93 Gatebox Fairing Kit List and Installation X 94 Open 0095 AT-802/802A Throttle Response Improvements X for PT6A-67F Engines 0096 AT-802/802A With PT6A-67F Engine X * Performance Check 0097 PT6A-67AG 2nd Stage Power Turbine Blades X 0098 AT-802/802A Performance Data With X * PT6A-67F Engine 0099 AT-802 Reverse Power Lock Lever Improvements X 0100 AT-802 Fuselage Fuel Tank Crack Repair Procedures X 0101 Oxygen Drive Gear X 0102 Repair-Sealant-Fuselage Fuel Tank Support Rod X * Indicates Revision SNOW ENGINEERING CO. ENGINEERING NUMBER 01 Wichita Falls, Texas REPORT ORDER MODEL All TITLE BY CHK'D SERVICE INFORMATION Leland Snow SERIAL All LETTER INDEX DATE *12/30/19 PAGE 5 OF APPLICABILITY 300 302 400 401 402 501 502 602 802 S/L 301 302A 400A 401B 402A 502A 802A No. SUBJECT 402B 502B 503A 504 802 SERVICE INFORMATION LETTERS CONT. 0103 Horizontal Stabilizer Skin Replacement X 0104 Artex ME406 ELT Installed Wiring X 0105 Gen II FRDS 8322101 Hydraulic Manifold Leakage X 0106 Rigging of Flap-Elevator Interconnect System X * 0107 Rigging of Aileron-Rudder Interconnect System X 0108 Rigging of Aileron Boost Tabs X 0109 Wing Fuel Tank Tabs X 0110 60950-1 FRDS GEN I Fire-gate Installed X 0111 Service Life of Rotor Component Parts in X PT6A-67F Engines GENERAL SERVICE INFORMATION LETTERS 003 Awareness of Air Tractor Behavior at Full Flaps X X X X X X X X X and Low g's. * Indicates Revision