AD 86-05-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | United Instruments, Inc. | Altimeters | Airworthiness Directives; UNITED INSTRUMENTS, INC. Altimeter Part Numbers 5934, 5934A, 5934M, 5934AM, 5934P, 5934PA, 5934PM, 5934PAM, 5934D, 5934PD, 5934AD, and 5934PAD |
Unsafe Condition
Possible erroneous altitude information from being displayed to the pilot due to unsynchronized altitude indication pointers and barometric pressure dial when adjusting the altimeter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check altimeters for synchronization by applying a slight outward pull on the adjustment knob while turning it and ensuring pointers and barometric dial move together. If unsynchronized, remove and return to United Instruments by July 1, 1986. All affected altimeters must be returned to United Instruments by July 1, 1986, for examination and modification.
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Compliance Time
Prior to further flight or no later than July 1, 1986
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Affected Aircraft
United Instruments, Inc. altimeters with part numbers 5934, 5934A, 5934M, 5934AM, 5934P, 5934PA, 5934PM, 5934PAM, 5934D, 5934PD, 5934AD, and 5934PAD, serial numbers 6C461-6C999, 7C000-7C999, 8C000-8C999, 9C000-9C999, 0D000-0D999, 1D000-1D999, 2D000-2D869, manufactured after February 1, 1985.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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