# AD 64-09-05: Induction System Alternate Air Doors

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-30
- Effective: April 29, 1964
- Published: April 25, 1964
- Issued: April 17, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 878 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B836E8755CE06502862569970057FB47.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/64-09-05

## The airworthiness directive

64-09-05 PIPER: Amdt. 721 Part 507 Federal Register April 25, 1964. Applies to Model PA-30 Aircraft Serial Numbers 30-1 to 30-321 Inclusive.

Compliance required as indicated.

  (a) Within the next 10 hours' time in service after the effective date of this AD, and within every 10 hours' time in service thereafter until a new alternate air door is installed per (b):

  (1) Inspect each engine induction system air takeoff assembly, P/N 23810- 00, for signs of hinge wear at the alternate air door P/N 23809-00.

  (2) Replace worn or loose alternate air doors before further flight.

  (b) Within the next 50 hours' time in service after the effective date of this AD, unless already accomplished, replace the P/N 23809-00 alternate air door with a new door P/N 23809-07 in accordance with Piper Kit Instructions 756794. After the new part is installed, the repetitive inspections in paragraph (a) are no longer required.

(Piper Service Bulletin No. 220 covers this samesubject.)

This directive effective April 29, 1964.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A1EA](https://openairdocs.org/tcds/A1EA): Piper Aircraft Inc.; names 1 of 3 models: PA-30

## 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: 878 (878 by airframe model, 0 by engine model)
- Makers: Piper 878

Models with the most aircraft:

- [Piper PA-30](https://openairdocs.org/model/piper-pa-30): 878 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/64-09-05/models.md
Every aircraft: https://openairdocs.org/ad/64-09-05/aircraft.md

Its text cites no advisory circulars or STCs.

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