AD 93-14-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-360-A1B6D | AVCO LYCOMING Model IO-360-A1B6D and IO-360-A3B6D Engines |
| engine | Lycoming Engines | IO-360-A3B6D | AVCO LYCOMING Model IO-360-A1B6D and IO-360-A3B6D Engines |
Unsafe Condition
Possible premature engine failure due to operation above 33.0 IN Hg manifold pressure.
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Required Actions
Fabricate and install an instrument panel placard stating 'DO NOT OPERATE ENGINE ABOVE 33.0 IN Hg', re-mark the manifold pressure gauge by moving the radial red line from 38.5 Hg to 33.0 Hg, revise the Aircraft Flight Manual Supplement's Limitations and Normal Procedure Sections by replacing 38.5 Hg and 36.0 Hg with 33.0 Hg, and attach the AD as a permanent appendix to the manual.
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Compliance Time
within 30 days after the effective date of this AD, unless accomplished previously
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Affected Aircraft
Lycoming Model IO-360-A1B6D and IO-360-A3B6D engines modified per Aircraft Design, Inc. STC SE4757NM and installed on Mooney M20J modified per STC SA4758NM
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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