AD 74-24-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | United Instruments, Inc. | Altimeters | Airworthiness Directives; UNITED INSTRUMENTS, INC.: Altimeters Installed On Various Aircraft |
Unsafe Condition
Altimeters may be deprived of readings during certain aircraft operating conditions.
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Required Actions
Within 10 hours' time in service after the effective date, check each altimeter or maintenance record to determine if it falls within specified part and serial numbers. If applicable, prior to further flight, either comply with paragraph C or install a placard restricting operation to day VFR only. By November 30, 1976, replace or modify the altimeter as specified.
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Compliance Time
Within the next 10 hours' time in service after the effective date; prior to further flight; on or before November 30, 1976
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Affected Aircraft
United Instruments, Inc. altimeters with P/N 5932 (Serial Numbers 47851-69000) and P/N 5934 (Serial Numbers 70,000-102,000, A1-A9999, B1-B9999, C1-C2860), installed on various aircraft including Piper, Beech, Cessna, Bell, Aero Commander, Schweizer, Enstrom, Helio, American Aviation, Bellanca.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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