# AD 47-10-07: Landing Gear Restriction Valve

- 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- Superseded by: Nothing supersedes this AD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/4C24417D7B2A67BC8625696D00719F66.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-07

## The airworthiness directive

47-10-07 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies Only to Model 49 Serial Numbers 2021 to 2088, Inclusive.

Compliance required prior to April 1, 1947.

Replace the existing restrictor valve (P/N 66404) in each main landing gear down line with a winterized type restrictor valve (LAC P/N 667489.)

(LAC Service Instruction 049/SI-75, 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/47-10-07/models.md
Every aircraft: https://openairdocs.org/ad/47-10-07/aircraft.md

Its text cites no advisory circulars or STCs.

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