Service Instruction No. 1517

DATE: October 27, 2006

MODELS AFFECTED

Lycoming model TIO-540-AK1A aircraft engines.

TIME OF COMPLIANCE

At overhaul or at owner’s discretion.

A slight increase in engine performance has been found by changing the engine timing from 20° BTC to 23° BTC. This modification has been incorporated in the current production of both new and rebuilt engines. This timing change does not affect the normal operating parameters of the engine and no other engine specifications have been modified.

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Service Instructions
Timing Change for TIO-540-AK1A Series Engines
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Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.
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https://www.lycoming.com/sites/default/files/Timing%20Change%20for%20TIO-540-AK1A%20Series%20Engines.pdf