# AD 76-11-06: Switch Bus Bar Link

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-31P
- Effective: June 4, 1976
- Published: June 1, 1976
- Issued: May 21, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2629
- Registered aircraft: 40 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ADBAC0F8722F39648625699E004A8E76.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/76-11-06

## The airworthiness directive

76-11-06 PIPER: Amendment 39-2629. Applies to Model PA-31P, S/Ns 31P-1 to 31P-7630001 inclusive, and 31P-7630003.

Compliance required within the next 100 hours in service after the effective date of this AD unless already accomplished.

To prevent the hazards associated with the possibility of the alternator switch bus bar link shorting to the adjacent fuselage bulkhead, accomplish the following:

  (a) Alter the existing switch bus bar link insulation in accordance with the "Instructions" paragraph in Service Bulletin No. 473, dated March 24, 1976, or with an approved alternate method.

  (b) Upon request with substantiating data submitted through an FAA Maintenance Inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region who must also approve any alternate alteration.

This amendment is effective June 4, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A8EA](https://openairdocs.org/tcds/A8EA): Piper Aircraft Inc.; names 1 of 6 models: PA-31P

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 40 (40 by airframe model, 0 by engine model)
- Makers: Piper 40

Models with the most aircraft:

- [Piper PA-31P](https://openairdocs.org/model/piper-pa-31p): 40 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/76-11-06/models.md
Every aircraft: https://openairdocs.org/ad/76-11-06/aircraft.md

Its text cites no advisory circulars or STCs.

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