AD 91-16-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace Model ATP Series Airplanes |
Unsafe Condition
The Smiths Industries Altimeter Repeater Units, Part Number 1205AM1, may fail to provide accurate altitude data due to a non-hardened knobshaft (Part Number AM10454) and improperly mounted microswitch.
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Required Actions
Install a hardened knobshaft (Part Number AM10588) replacing Part Number AM10454, remount the microswitch per Smiths Industries Modification No. 02, and comply with British Aerospace Service Bulletin ATP-34-40. Alternative methods may be approved by the FAA.
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Compliance Time
within 120 days after the effective date of this AD
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Affected Aircraft
British Aerospace Model ATP series airplanes equipped with Smiths Industries Altimeter Repeater Units, Part Number 1205AM1
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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