- Effective
- August 16, 1971
- Models
- M-4-180C, M-4-220C
- Data sheet
- TCDS3A23
- Registered aircraft
- 87 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-1261
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | 9465e53c…43df031 | FAA DRS (API key needed) |
On this page
The airworthiness directive
71-17-01 MAULE AIRCRAFT: Amendment 39-1261. Applies to Model M-4-180 serial numbers 3001 C through 3005C and Model M-4-220 serial numbers 2001C through 2070C, certificated in all categories.
Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive.
To prevent fuel line blockage due to low spots and to maintain the firewall fire protection, accomplish the following:
(1) Inspect the fuel line located underneath the front seats for low undrainable spots. If low spots are found, remove low spots by hand bending and resecure fuel line with additional clamps or ty-raps. With the aircraft in a three point position, this fuel line must have a downward slope from the right side to the left side of the aircraft.
(2) Inspect fuel feed line firewall bulkhead fitting located on the left side of the firewall and ascertain that it is a steel AN832-6 fitting. If the fitting is aluminum, replace it with an AN832-6steel fitting.
Maule Service Letter 23 covers the above inspections and changes.
This amendment becomes effective August 16, 1971.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 87
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1967 | 2 |
|---|---|
| 1968 | 4 |
| 1969 | 5 |
| 1970 | 11 |
| 1971 | 12 |
| 1972 | 23 |
| 1973 | 11 |
19 with no year recorded