AD 71-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maule Aerospace Technology, Inc. | M-4-180C | Airworthiness Directives; Maule Model M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220C | Airworthiness Directives; Maule Model M-4-180 and M-4-220 |
Unsafe Condition
Fuel line blockage due to low spots and inadequate firewall fire protection from an aluminum fuel feed line firewall bulkhead fitting.
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Required Actions
Inspect and remove low spots in the fuel line under the front seats by hand bending and resecuring with clamps or ty-raps. Ensure the fuel line slopes downward from right to left when in three-point position. Inspect and replace aluminum firewall bulkhead fittings with AN832-6 steel fittings.
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Compliance Time
within the next 50 hours' time in service after the effective date of this airworthiness directive
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Affected Aircraft
Maule Model M-4-180 serial numbers 3001C through 3005C and Model M-4-220 serial numbers 2001C through 2070C
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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