United instruments airworthiness directives
1 AD in the reference matching United instruments — from the Federal Register, checked every weekday. Applicability may depend on serial and effectivity: verify against the official AD before any maintenance action.
Reference last synced: 10/27/2026 17:00 UTC · 10,471 ADs indexed
AD 2017-04-06Effective 04/07/2017
Airworthiness Directives; United Instruments, Inc. Series Altimeters
We are adopting a new airworthiness directive (AD) for certain United Instruments, Inc. 5934 series altimeters that were manufactured between January 2015 and February 2016 and installed in airplanes and helicopters. This AD was prompted by reports of certain altimeters displaying higher than actual altitude due to a slow diaphragm leak, which would affect the accuracy of the altimeters. This AD requires replacing t…