AD 77-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mooney Aviation Company Inc | M20J | Airworthiness Directives; Mooney Model M20J Airplanes |
Unsafe Condition
False altitude, airspeed, and vertical speed indications presented to the pilot due to contamination or malfunction of the alternate static source valve (Gerdes P/N A-1390).
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Required Actions
Disassemble, clean, lubricate, and reassemble the alternate static source valve (Gerdes P/N A-1390), and leak test the static system in accordance with Mooney Service Bulletin No. M20-197 or later approved revision.
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Compliance Time
Before further flight in instrument meteorological conditions, or night flight, or within the next 5 hours' day visual flight rules time in service after the effective date of this AD, unless already accomplished.
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Affected Aircraft
Mooney Model M20J airplanes with serial numbers 24-0001 through 24-0085, 24-0087, 24-0088, 24-0090 through 24-0095, 24-0097 through 24-0102.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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