# AD 47-10-22: Fire Extinguisher Valve Washer

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 49-46
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A379CC0BF561180D8625696D00458B67.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-22

## The airworthiness directive

47-10-22 LOCKHEED: (Was Mandatory Note 24 of AD-763-3.) Applies to Model 49 Serials 1975, 1976, 1977, and 2021 Through 2065.

Compliance required prior to March 1, 1947.

Install steel retainer washer (American LaFranch P/N 2CD-3054C) in place of existing aluminum alloy retainer washer on fire extinguisher selector valve.

(LAC Service Bulletin 49/SB-27 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-763](https://openairdocs.org/tcds/A-763): Lockheed Martin Aeronautics Company; names 1 of 6 models: 49-46

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Lockheed 1

Models with the most aircraft:

- [Lockheed 49-46](https://openairdocs.org/model/lockheed-49-46): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/47-10-22/models.md
Every aircraft: https://openairdocs.org/ad/47-10-22/aircraft.md

Its text cites no advisory circulars or STCs.

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