AD 77-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | True Flight Holdings LLC | AA-5 | Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes |
| aircraft | True Flight Holdings LLC | AA-5A | Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes |
Unsafe Condition
Failure of the carburetor heat valve assembly due to cracks in the bend radius of Configuration A.
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Required Actions
Inspect the carburetor heat valve assembly within 10 flight hours after the effective date. If Configuration A is installed, inspect for cracks; replace with Part Number 5503006-505 if cracks are found. Reinspect after 25 hours of operation and again after 50 total hours. Perform carburetor heat rise checks including gap measurements and engine run-up as specified.
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Compliance Time
Within 10 hours of flight after the effective date of this AD
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Affected Aircraft
Grumman American Aviation Corporation Model AA-5, Serial Numbers 0641 through 0834, and Model AA-5A, Serial Numbers 0001 through 0321
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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