AD Amdt-39-15005
Unsafe Condition
Cylinder head fatigue failure and separation at the head-to-barrel threaded interface, which can lead to engine failure, a possible engine compartment fire, and damage to the airplane.
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Required Actions
Remove from service installed SAP cylinder assemblies listed in this AD, no later than 150 hours total time-in-service (TIS).
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Compliance Time
Within 150 hours total time-in-service (TIS)
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Affected Aircraft
Superior Air Parts, Inc. (SAP) cylinder assemblies, manufactured between April 2005 and November 2005, part numbers: SA47000L-A1, SA47000L-A20P, SA47000S-A1, SA47000S-A20P, SA47000S-A21P, SA52000-A1, SA52000-A20P, SA52000-A21P, SA52000-A22P, SA52000-A23P, SA55000-A1, and SA55000-A20P, installed in Teledyne Continental Motors (TCM) 470, 520, and 550 series reciprocating engines, Lycoming Engines (LE) 320, 360, and 540 series reciprocating engines, Avco Lycoming (AL) 540 series reciprocating engines, and SAP 360 series reciprocating engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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