AD 73-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maule Aerospace Technology, Inc. | M-4-180C | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220C | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220S | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
Unsafe Condition
Engine overheat during climb and incorrect cylinder head temperature reading
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Required Actions
Install Maule slug P/N 6002B-3 in No. 4 cylinder head thermocouple hole; relocate cylinder head temperature sender to No. 4 cylinder head; install engine top baffle Maule P/N 5031X-3, all in accordance with specified service letters.
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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 Models M-4-180C (serial numbers 3001C through 3006C, 3002C through 3006C), M-4-220S (serial number 2001S), and M-4-220C (serial numbers 2135C through 2175C, 2177C; 2001C through 2126C, 2129C through 2175C, 2177C; 2053C through 2126C, 2129C through 2175C, 2177C)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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