| AD Number | 71-17-01 | Status | Active |
| Effective Date | August 16, 1971 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-1261 |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Maule Aerospace Technology, Inc. |
| Model(s) | M-4-180C M-4-220C |
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.