VENDOR SERVICE PUBLICATION
Piper PA-14 Family Cruiser · Service Bulletins
Overview
This document is a Vendor Service Publication (VSP-62) issued on April 7, 1986, addressing service bulletin No. 464A from AVCO Lycoming. It is intended for all owners and operators of various Piper aircraft, including the PA-14 Family Cruiser. The bulletin highlights a potential failure of the impulse coupling, which could lead to a total loss of engine power. The document outlines compliance requirements and inspection procedures necessary to ensure safety and reliability of the affected aircraft. It serves as an important communication tool for maintaining airworthiness and operational safety in the Piper fleet.
- The service bulletin addresses potential impulse coupling failure in multiple Piper aircraft models, including the PA-14 Family Cruiser.
- Affected serial numbers for the PA-14 range from 14-01 to 14-523.
- Compliance with inspection procedures is mandatory for all magnetos with less than 300 operating hours before the next engine start.
- Inspection procedures include checking flyweights for proper heat treatment and replacing defective parts immediately.
- The estimated man hours required for inspection are 1.0 hour for shallow flange magnetos and 1.25 hours for deep flange magnetos.
Document
Source
Originally published by www.univair.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 1986
- Pages
- 5
- File size
- 434 KB
- Publisher
- www.univair.com
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In this document
Models Affected
The service bulletin applies to several Piper aircraft models, including the PA-12 Super Cruiser, PA-14 Family Cruiser, PA-16 Clipper, PA-18 Super Cub, and others. Specific serial numbers for each model are listed, indicating which aircraft may be affected by the impulse coupling issue.
Purpose
The purpose of this service bulletin is to distribute information regarding AVCO Lycoming Service Bulletin No. 464A. It aims to alert owners and operators about the potential for impulse coupling failure and to provide necessary inspection procedures.
Compliance Time
Compliance with the service bulletin is required as specified in the attached Bendix Service Bulletin No. 623A. This includes inspections of the impulse coupling cam assemblies and necessary actions to prevent failure.
Inspection Procedures
The bulletin details inspection procedures for the impulse coupling, including the removal of the magneto from the engine, inspection of flyweights, and identification of compliant parts. Specific steps are provided to ensure thorough inspection and compliance.
General Information
The bulletin warns of improperly heat-treated flyweights that could lead to impulse coupling failure. It emphasizes the importance of inspection and replacement of defective components to maintain engine reliability.
Safety notes
- Failure of an impulse coupling can result in total loss of engine power.
- All magnetos with impulse couplings must be inspected to prevent failure.
Full document text
VSP-62 April 7, 1986 VENDOR SERVICE PUBLICATION TO: All Owners/Operators, Piper Distributors, Factory Direct Dealers and Piper Field Service Facilities SUBJECT: AVCO Lycoming Service Bulletin No. 464A MODELS AFFECTED: PA-12 Super Cruiser PA-14 Family Cruiser PA-16 Clipper PA-18 Super Cub PA-20 Pacer PA-22 Tripacer/Colt PA-23-150/160 Apache PA-23-235 Apache PA-23-250 Aztec PA-24-180/250 Comanche PA-25-150/235/260 Pawnee PA-28-150/160/180 Cherokee PA-28-140 Cherokee PA-28-161 Warrior II PA-28-181 Archer II PA-28R-180 Arrow PA-28R-200 Arrow II PA-28R-201 Arrow III PA-28RT-201 Arrow IV PA-28-235 Cherokee PA-30 Twin Comanche PA-32-300 Cherokee Six PA-32-301 Saratoga PA-34-200 Seneca PA-36-300 Brave PA-38-112 Tomahawk PA-39 Twin Comanche PA-44-180 Seminole PA-44-180T Turbo Seminole SERIAL NUMBERS AFFECTED: 12-02 through 12-4036 14-01 through 14-523 16-01 through 16-736 18-01 through 18-8309025 20-01 through 20-1121 22-01 through 22-9848 23-01 through 23-2046 27-505 through 27-622 27-01 through 27-2504 24-01 through 24-2387 25-01 through 25-8156024 28-01 through 28-7505261 28-20001 through 28-7725290 28-7716001 through 28-8516099 28-7690001 through 28-8590045 28R-30001 through 28R-7130019 28R-35001 through 28R-7635545 28R-7737001 through 28R-7837335 28R-7918001 through 28R-8218039 28-10001 through 28-7710089 30-01 through 30-2000 32-40001 through 32-7940290 32-8006001 through 32-8506021 34-7250001 through 34-7450220 36-7760001 through 36-8160023 38-78A0001 through 38-82A0122 39-01 through 39-155 44-7995001 through 44-8195040 44-8107001 through 44-8207031 S/M COMPLIANCE TIME: As specified in attached Bendix Service Bulletin No. 623A. VENDOR SERVICE PUBLICATION NO. 62 PAGE 2 OF 2 PURPOSE: To distribute AVCO Lycoming Service Bulletin No. 464A to all Owners/Operators, Piper Distributors, Factory Direct Dealers and Piper Field Service Facilities. The attached AVCO Lycoming Service Bulletin addresses a potential for impulse coupling failure. Failure of an impulse coupling can result in total loss of engine power. Affected AVCO Lycoming equipment may be installed in the above listed Piper airplanes. dL7AVCD LYCOMING DIVISION WILLIAMSPORT, PENNSYLVANIA 17701 ~QI1~~~~ GlmOO~a~m ----------~OC~)________ __DATE: SUBJECT: October 18, 1986 Service Bulletin No. 464A (Supersedes Service Bulletin No. 464) Engineering Aspects are FAA Approved Bendix Service Bulletin Revision No. 623A. Supplement No. 1 to Service Bulletin No. 464 is a revision of Bendix Service Bulletin No. 623 . ......................~~~~~~~~~~~~~~~~~~ I AlliED Bendix Bendix Engine Products Division I~~ ~ Jacksonville, Fl. 32245-78801 SERVICE BULLETIN .... 00278 II ~ Engineering Aspects are FAA Approved Bulletin No. 623A IDate 9/1982 1 Revised 8/1984 • •SUBJECT: REASON FOR BULLETIN: EQUIPMENT AFFECTED: Inspection of impulse coupling cam assemblies. I 1. To alert all users of possible impulse coupling failure. 2. To provide an inspection procedure to preclude failure of the impulse coupl- ing. All Bendix magnetos with type designations as follows: S4LN·21/1226/1227 84LN-200 P/N 10.163005-7 86RN-21/23/25/1225/1227 D-3000 all S4RN-21/1225/1227 86LN-21/23/25/1225/1227 D-2021/2031 (Refer to Bendls PublictJtitm L·ll47 Aircraft Impulse Coupling Cross Reference Data as required.} Except Bendix Blue Label mapetos above S/N 8236001 Except Bendix Red Label mapetos above serial numbers as indicated below: 8·20: 8·200: 8-1200: D·2000: D-3000: B·001171 or A297043 B·001732 or A297043 B·001162 or A297048 35550 B·000249 or 5806 Page 1 of 3 MAINTENANCE (SPARE) PARTS AFFECTED: 1. All impulse coupling cam assemblies. 2. All impulse coupling assemblies. 3. All spare magnetos incorporating an impulse coupling. COMPLIANCE: 1. All magnetos having impulse couplings with less than 300 operating hours must be inspected and identified as having complied with this Service Bulletin prior to the next engine start. 2. All spare parts must be inspected and identified before being put into service. GENERAL INFORMATION: Some improperly heat treated (soft) flyweights have been reported on impulse couplings currently in service. If this condition exists and is not detected, impulse coupling failure could occur. The flyweights must be inspected in accordance with the instructions in this Service Bulletin and if defective (soft) the impulse coupling or cam assembly must·be replaced immediately. DETAILED INSTRUCTIONS: (Refer to appropriate Bendix Magneto Overhaul Instruc· tions for the magneto series being inspected.) NOTE The magneto should be removed from the engine only to the extent necessary to perform the in· spection described herein. Depending on the engine application, it may not be necessary to remove the harness from the magneto for the inspection procedure. NOTE All magnetos with the impulse coupling recessed into the magneto flange must have the impulse coupling removed from the magneto to perform the inspection. This is a bench operation and will require the magneto to be completely removed from the engine and the harness removed from the magneto. 1. Following published procedures remove the magneto from the engine. 2. Place the magneto in a suitable work stand with the impulse coupling facing up. Page 2 of 3 Service Bulletin No. 464A 3. Use finger pressure to push inward on the toe (see figure 1) of each flyweight so that the flyweight heel protrudes outward. 4. Using a fine 11, double cut, 1/2 inch wide file, at least 3/32 inch thick, pass the file across the heel of the flyweight attempting to remove material. (See figure 1.) If the flyweight has been properly heat treated the file will "glide" smoothly over the heel of the flyweight, removing no material. If the flyweight is not properly heat treated (soft), the file will not "glide" easily across the surface of the flyweight heel, and material will be removed. FILE IN THIS AREA ~ /TOE ~ Figure 1. Note: XXX indicates heat treated flyweight by lot number
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5. If an improperly heat treated (soft) flyweight is found, immediately remove and replace the cam assembly and/or the impulse coupling asser;nbly followin~ pro- cedures in the ma eto overhaul instructions, an a · mg stnct attentiOn to notes an cautiOns. 6. Inspect the impulse coupling stop pins for wear and replace as necessary. 7. After flyweights and stop pins have been inspected and the impulse coupling reinstalled on the magneto (if removed), identify the magneto by stamping a 1I 16 inch letter "F" in the upper right corner of the identification plate to indicate this Service Bulletin has been complied with. 8. Reinstall the magneto on the engine following publish· ed procedures. 9. Make an appropriate engine log book entry, recording magneto serial number, to indicate that this Service Bulletin has been complied with. 10.1nspect all spare parts assemblies, including magnetos, following the same procedures described in steps 3 and 4 of the Detailed Instructions of this Ser· vice Bulletin. If both flyweights are found acceptable, identify the cam assembly by applying yellow Dykem or yellow lacquer to the heel of each flyweight. On magneto spares, stamp a 1/16 inch letter "F" in the upper right corner of the identification plate to in· dicate this Service Bulletin has been complied with. 11. Any cam assembly with an improperly heat treated I(soft) flyweight should be returned to the manufac- turer through a cWTentl~ Authorized Bendix Engine Products Division Distri utor. 12. A new method of marking is being implemented to permanently identify heat treated cam assembly flyweights. See figure "1" for location. Pending con- sumption of current inventory, there will be a mixture of assemblies identified by the following methods. 1. Original method- Yellow paint (Dykem or Lac- quer) on the heel of each flyweight. 2. New method--- Stamped numbers as indicated in figure "1" on each flyweight. Service Bulletin No. 464A WARRANTY CONSIDERATION: None applicable SPECIAL TOOLS REQUIRED: Refer to applicable manuals. MAN HOURS REQUIRED: 1.0 hour per engine with shallow flange mag. 1.25 hours per engine with deep flange mag. WEIGHT CHANGE: None Page 3 of 3