AD Amdt-39-11434
Unsafe Condition
Shuttle valve failure and standby vacuum system malfunction on aircraft equipped with Precise Flight, Inc. Model SVS III standby vacuum systems.
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Required Actions
Incorporate revised operating limitations into the airplane flight manual (AFM). Repeatedly inspect the push-pull cable, vacuum lines, saddle fittings, and shuttle valve for correct installation and damage. Immediately correct any discrepancies found and conduct a function test of the vacuum system after each inspection.
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Compliance Time
Within the next annual inspection period.
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Affected Aircraft
Precise Flight, Inc. Model SVS III standby vacuum systems installed on aircraft listed in the AD, either in accordance with the applicable supplemental type certificate (STC) or through field approval.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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