# AD 54-26-01: Landing Gear Valve Placard

- Type: Airworthiness directive
- Status: Current
- Products: Gulfstream American G-44 and G-44A
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 82 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/16F040A68EC4286286256A38005B9B6C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/54-26-01

## The airworthiness directive

54-26-01 GRUMMAN: Applies to All Models G-44 and G-44A Aircraft.

Compliance required by June 15, 1955.

There have been reported numerous instances of the landing gear locking mechanism failing because of either hydraulic system leaks or failure of the mechanical locks. These malfunctions have been reported in both the up and down position of the landing gear. To prevent future similar malfunctions, provide a more positive means of holding the gear in its locked position, both in the fully extended and fully retracted positions. Grumman Service Bulletin No. 24, October 18, 1954, accomplishes this by providing a closed center hydraulic system. This arrangement provides hydraulic pressure to hold the gear in the selected position and unwanted extension or retraction is prevented even though the mechanical locks may fail or leaks develop in the hydraulic system.

This supersedes AD 48-05-05.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-734](https://openairdocs.org/tcds/A-734): Frakes Aviation; names 2 of 3 models: G-44A, G-44

## 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: 82 (82 by airframe model, 0 by engine model)
- Makers: Grumman 82

Models with the most aircraft:

- [Grumman G-44](https://openairdocs.org/model/grumman-g-44): 53 aircraft (airframe model)
- [Grumman G-44A](https://openairdocs.org/model/grumman-g-44a): 29 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/54-26-01/models.md
Every aircraft: https://openairdocs.org/ad/54-26-01/aircraft.md

Its text cites no advisory circulars or STCs.

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