# AD 74-21-02: Stall Warning System

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-36-285
- Effective: October 4, 1974
- Published: October 3, 1974
- Issued: September 20, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1981
- Registered aircraft: 40 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/097AB21D27E865708625699900513E59.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/74-21-02

## The airworthiness directive

74-21-02 PIPER: Amendment 39-1981. Applies to Piper PA-36-285 airplanes serial numbers 36-7360001 through 36-7460025 certificated in all categories.

Compliance required within the next 50 hours time in service after the effective date of this AD, unless already accomplished.

To provide a more reliable stall warning system, accomplish the lift detector relocation and modification per Piper Service Bulletin No. 418 or equivalent approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.

This amendment becomes effective October 4, 1974.

## 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-36-285](https://openairdocs.org/model/piper-pa-36-285): 40 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/74-21-02/models.md
Every aircraft: https://openairdocs.org/ad/74-21-02/aircraft.md

Its text cites no advisory circulars or STCs.

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