51-03-01: Fuel Line Rework
FAA order 51-03-01 is an airworthiness directive. The FAA's subject line: Fuel Line Rework. It names Mooney M-18: about 98 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: fuel system.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Mooney Mite Aircraft Corporation
- Models
- M-18C, M-18C 55, M-18L, M-18LA
- On this site
- Mooney M-18 98 registered
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 (617 characters)
51-03-01 MOONEY: Applies to Model M-18 Series Aircraft, Serial Numbers 1 Through 82 and 201 Through 236.
Compliance required not later than March 15, 1951.
There have been reported failures of the fuel line due to vibration and relative motion between the fuel tank and the fuel shutoff valve. To preclude the possibility of recurrence of this type failure, cut the fuel line at a point approximately 4 inches from the fuel tank outlet and install a 4-inch length of 3/8-inch ID approved aromatic resistant flexible hose and hose clamps at this point.
(Mooney Service Bulletin No. 6 covers this same subject.)
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 October 5, 2026. Connections as data: /graph/directive/51-03-01.json · aircraft systems.