54-26-01: Landing Gear Valve Placard
FAA order 54-26-01 is an airworthiness directive. The FAA's subject line: Landing Gear Valve Placard. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Gulfstream American Corporation
- Models
- G-44, G-44A
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (915 characters)
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.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/54-26-01.json · aircraft systems.