SERVICE BULLETIN No. 836A
Piper PA-31T Cheyenne II · Service Bulletins
Overview
This Service Bulletin No. 836A from Piper Aircraft Corporation addresses mandatory compliance for various aircraft models, including the Piper PA-31T Cheyenne II. Issued on August 26, 1986, it supersedes the previous bulletin dated May 21, 1986. The bulletin outlines the need for inspection and potential replacement of aluminum wire with copper wire in specific electrical connections to prevent overheating and potential electrical fires. The document provides detailed instructions for identifying affected cables and the necessary materials for compliance. It emphasizes the importance of addressing corrosion issues that can arise between aluminum terminals and wires, which can lead to high electrical resistance and overheating.
- Compliance with Service Bulletin No. 836A is mandatory for the PA-31T Cheyenne II.
- Inspect and replace aluminum wire in specified electrical connections to prevent overheating.
- Compliance must occur at the next scheduled inspection or within 50 hours of operation.
- Use AN-4 or AN-2 copper wire for replacements, as specified in the bulletin.
- Proper crimping tools must be used for all connections to ensure safety.
Document
Source
Originally published by bsd-box.net. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 1986
- Pages
- 4
- File size
- 194 KB
- Publisher
- bsd-box.net
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In this document
Models Affected
The bulletin applies to a wide range of Piper aircraft, including the PA-31T Cheyenne II, as well as various models from the Cub, Cherokee, Comanche, and Navajo series. A complete list of affected models is provided, ensuring that operators of these aircraft are aware of their compliance obligations.
Compliance Time
Operators are required to comply with the bulletin at the next regularly scheduled inspection event, but not to exceed fifty (50) hours of operation. This ensures timely action to mitigate the risks associated with the identified electrical issues.
Inspection Instructions
The bulletin details a step-by-step process for inspecting specific cables, including the battery to ground, battery to master relay, and starter solenoid connections. If aluminum wire is found, it must be replaced with copper wire of specified types, ensuring compliance with safety standards.
Materials Required
Replacement cables must be fabricated from AN-4 or AN-2 copper wire, depending on the type of aluminum wire being replaced. The bulletin lists various copper wire specifications and terminal types that are acceptable for use, emphasizing the need for proper materials to ensure safety.
Cautionary Notes
The bulletin stresses the importance of using the correct crimping tools for the copper cable and terminal combinations to prevent future electrical issues. Proper installation is crucial to maintain the integrity of the electrical system.
Safety notes
- Corrosion between aluminum terminals and wires can lead to overheating and electrical fires.
- Failure to comply with the bulletin may result in serious safety hazards.
Full document text
Piper Aircraft Corporation Vero Beach, Florida, U.S.A. FAA Approved SERVICE No. 836A BULLETIN ***********+********************** x PIPER CONSIDERS :: t COMPLIANCE MANDATORY : :****** ***+**********w****+****~*~ Date August 26, 1986 S/M (Service Bulletin No. 836A supersedes and voids Service Bulletin No. 836, dated May 21, 1986) SUBJECT: REASON FOR REVISION: MODELS AFFECTED: E-2/J-2 Series Cub J-3, NE-1, L-4 Series Cub J-4 Series Coupe J-5, J-5C, L-14, AE-1, HE-1 Series Cub Cruiser PA-11 Cub Special PA-12 Super Cruiser PA-14 Family Cruiser PA-15 Vagabond PA-16 Clipper PA-17 Vagabond PA-18 Super Cub PA-19 Pacer PA-20 Pacer PA-22 Tripacer/Colt PA-23-150/160 Apache PA-23-235 Aztec PA-23-250 Aztec PA-24-180/250 Comanche PA-24-260 Comanche PA-24-400 Comanche PA-25-150 Pawnee PA-25-235 Pawnee PA-25-260 Pawnee PA-28-140 Cherokee PA-28-150/160 Cherokee PA-28-151 Warrior PA-28-161 Warrior II PA-28-180 Cherokee PA-28R-180 Arrow PA-28-181 Archer II Aluminum Wire Inspection/Replacement To correct Serial Numbers Affected and Revise Instructions. SERIAL NUMBERS AFFECTED: A11 A11 A11 5-01 through 5-1389 11-01 through 11-1678 12-01 through 12-4036 14-01 through 14-523 15-01 through 15-388 16-01 through 16-736 17-01 through 17-215 18-01 through 18-8309025 19-01 through 19-03 20-01 through 20-1121 22-01 through 22-9848 23-01 through 23-2046 27-505 through 27-622 27-01 through 27-7954121 24-01 through 24-3687 24-3642 through 24-6000 26-01 through 26-148 25-01 through 25-731 25-2000 through 25-8056038 25-4415 through 25-8156024 28-20001 through 28-7725290 28-01 through 28-4377 28-7415001 through 28-7715314 28-7716001 through 28-8216226 28-671 through 28-7505259 and 28-E13 28R-30001 through 28R-7130013 28-7690001 through 28-8290061 (over) ATA: 2400 SERVICE BULLETIN NO. 836A PAGE 2 OF 4 MODELS AFFECTED: (Cont'd) PA-28R-200 Arrow/Arrow II PA-28R-201 Arrow III PA-28-201T Turbo Dakota PA-28R-201T Turbo Arrow III PA-28RT-201 Arrow IV PA-28RT-201T Turbo Arrow IV PA-28-235 Cherokee PA-28-236 Dakota PA-30 Comanche PA-31-300 Navajo PA-31-310 Navajo PA-31-325 Navajo PA-31-350 Navajo Chieftain PA-31P Pressurized Navajo PA-31T Cheyenne/Cheyenne II PA-31T1 Cheyenne I PA-32-301T Turbo Saratoga PA-34-200 Seneca I PA-34-200T Seneca II PA-34-220T Seneca III PA-36-285 Brave PA-36-300 Brave PA-36-375 Brave PA-38-112 Tomahawk PA-39 Twin Comanche PA-44-180 Seminole PA-44-180T Turbo Seminole SERIAL NUMBERS AFFECTED: (Cont'd) 28R-35001 through 28R-7635545 28R-7737001 through 28R-7837317 28-7921001 through 28-7921091 28R-7703001 through 28R-7803372 28R-7918001 through 28R-8118082 28R-7931001 through 28R-8131192 28-10001 through 28-7710089 and 28-E11 28-7911001 through 28-8211013 30-02 through 30-2000 31-228 through 31-511 31-05 through 31-8012070 31-7400990 through 31-8012070 31-5001 through 31-8052153 31P-03 through 31P-7730012 31-7400001 through 31-7920094 31-7804002 through 31-7904057 32-8024001 only 34-7250001 through 34-7450220 34-7570001 through 34-8170092 34-8133001 through 34-8233205 36-7360001 through 36-7660135 36-7760001 through 36-7960078 36-7802001 through 36-7902051 38-78A0001 through 38-82A0122 39-01 through 39-155 44-7995001 through 44-8195026 44-8107001 through 44-8207020 COMPLIANCE TIME: At the next regularly scheduled inspection event, but not to exceed fifty (50) hours of operation. PURPOSE: Field reports have been received of corrosion between the aluminum terminal and aluminum wire at the battery positive post, resulting in overheating of the wire due to high electrical resistance. If this condition exists and is left uncorrected, excessive heat build-up could result in an electrical fire. Corrosion and resulting high resistance can also occur in the battery to ground, battery to master relay, master relay to starter solenoid, starter solenoid to starter and engine return ground cables. INSTRUCTIONS: 1. On each affected aircraft, locate and identify the following cables: A. Battery to ground B. Battery to master relay C. Master relay to starter solenoid D. Starter solenoid to starter E. Engine return ground cable (engine to airframe) SERVICE BULLETIN NO. 836A PAGE 3 OF 4 INSTRUCTIONS: (Cont'd.) 2. Inspect the cables listed above for the presence of aluminum wire. 3. If aluminum wire is found, replace the affected cable(s) with copper cable(s). NOTE: Replacement cables for AL-1 wire shall be fabricated of AN-4 copper wire; for AL-00 wire, fabricate from AN-2 copper wire, using copper wire listed below, all wire recommended is of 150°C rating. Copper Wire Mil-W-22759/4 Mil-W-22759/41 Mil-W-22759/8 Mil-W-81044/5 Mil-W-22759/13 Mil-W-81044/6 Mil-W-22759/16 Mil-W-81044/8 Mil-W-22759/34 Mil-W-81044/9 Use appropriate terminals listed below or equivalent. AN-2 AMP 1/4 51982 1/4 51982-1 5/16 51982-2 1/4 324034 3/8 35249 3/8 321600 1/2 51982-3 AN-4 1/4 321671 5/16 322010 3/8 322898 3/8 322011 1/4 33469 5/16 33470 3/8 33471 3/8 324102 3/8 321121 AMP AMP AMP 320383 322870 321600 321602 Mil. Spec. MS20659-113 MS20659-147 MS20659-114 MS20659-113 Requires 90° bend MS20659-114 Requires 90° bend MS20659-114 MS20659-133 Mil. Spec. MS25036-123 MS25036-124 MS25036-125 Requires 90° bend MS25036-125 MS20659-111 MS20659-132 MS20659-112 MS25036-125 Requires 90° bend MS25189-115 CAUTION: Use of proper crimping tool for copper cable/terminal combination utilized is required. MATERIAL REQUIRED: To be determined by inspection. (over) SERVICE BULLETIN 836A PAGE 4 OF 4 AVAILABILITY OF PARTS: Your Piper Field Service Facility or local procurement. EFFECTIVITY DATE: This Service Bulletin is effective upon receipt. SUMMARY: Please contact your Piper Field Service Facility to arrange for compliance with this Service Bulletin in accordance with Compliance Time indicated. NOTE: If you are no longer in possession of this aircraft, please forward this information to the present owner.