AD 78-13-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | True Flight Holdings LLC | AA-1 | Airworthiness Directives; Grumman American Aviation Corporation Model AA-1, AA-1A, AA-1B Airplanes |
| aircraft | True Flight Holdings LLC | AA-1A | Airworthiness Directives; Grumman American Aviation Corporation Model AA-1, AA-1A, AA-1B Airplanes |
| aircraft | True Flight Holdings LLC | AA-1B | Airworthiness Directives; Grumman American Aviation Corporation Model AA-1, AA-1A, AA-1B Airplanes |
Unsafe Condition
Failure of the fuel measurement gauge float and associated components could lead to inaccurate fuel quantity indication, increasing the risk of unintentional fuel exhaustion in flight.
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Required Actions
Defuel the tanks, remove access panels, disconnect fuel lines, disassemble gauges, replace float with Grumman Part Number 401129-5, install two new Part Number 14.2 'U' Cup Packings, reassemble, and check for leaks. The modification can be done by a certificated mechanic or repair station.
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Compliance Time
within next 200 hours in service after the effective date of this AD
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Affected Aircraft
Grumman American Aviation Corporation Models AA-1, AA-1A (all serial numbers), and AA-1B (Serial Number AA-1B 0001 through AA-1B 0542)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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