# AD 76-04-10: Toxic Fumes

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-31-350
- Effective: March 5, 1976
- Published: March 4, 1976
- Issued: February 20, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2531
- Registered aircraft: 399 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A945C0EAEE1B4EA98625699E004A8B54.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/76-04-10

## The airworthiness directive

76-04-10 PIPER AIRCRAFT: Amendment 39-2531. Applies to Model PA-31-350, S/Ns 31-5001 to 31-7552073 inclusive.

Compliance required within the next 100 hours' time in service after the effective date of this AD unless already accomplished. To prevent the hazards associated with toxic fumes from the battery being drawn into the cabin, accomplish the following:

  (a) Relocate and modify the battery drain and vent system in accordance with Piper Service Bulletin No. 460A, dated January 23, 1976, or equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

  (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 & Manufacturing Branch, FAA Eastern Region.

This amendment is effective March 5, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A20SO](https://openairdocs.org/tcds/A20SO): Piper Aircraft Inc.; names 1 of 4 models: PA-31-350

## 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: 399 (399 by airframe model, 0 by engine model)
- Makers: Piper 399

Models with the most aircraft:

- [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350): 399 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/76-04-10/models.md
Every aircraft: https://openairdocs.org/ad/76-04-10/aircraft.md

Its text cites no advisory circulars or STCs.

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