AD 77-08-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | True Flight Holdings LLC | AA-5A | Airworthiness Directives; Grumman American Aviation Corporation Model AA- 5A, and Model AA-5B, Airplanes |
| aircraft | True Flight Holdings LLC | AA-5B | Airworthiness Directives; Grumman American Aviation Corporation Model AA- 5A, and Model AA-5B, Airplanes |
Unsafe Condition
Faulty altitude, airspeed, and vertical speed indications from the alternate static source valve Gerdes part number A-1390 due to contamination or lack of lubrication.
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Required Actions
Disassemble, clean, lubricate, and reassemble the alternate static source valve Gerdes part number A-1390, and leak test the static system following specified procedures including Grumman American Service Bulletin No. 160 or FAA AC 43-203A.
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Compliance Time
Prior to further flight under Instrument Flight Rules (IFR) or night flight, or within the next 25 hours day Visual Flight Rules (VFR) time in service after the effective date of this AD or the next scheduled inspection, whichever comes first.
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Affected Aircraft
Grumman American Aviation Corporation Model AA-5A (serials AA5A-0001 through AA5A-0340) and Model AA-5B (serials AA5B-0001 through AA5B-0451) equipped with an alternate static source system.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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