AD 77-07-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | O-320-H2AD | AVCO LYCOMING Model O-320-H2AD Series Engines |
Unsafe Condition
The incorrect installation of part numbers LW-14784 or LW-15481 oil level gage could occur without modifying the P/N 75675 oil filler extension with a P/N LW-15498 perforated sleeve.
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Required Actions
Remove the P/N 75675 oil filler extension, install a P/N LW-15498 perforated sleeve with specific positioning and cutting as per instructions, bend the sleeve to form a tab, and reinstall with proper gasket and selected oil level gage. Compliance may be adjusted via FAA approval.
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Compliance Time
within 50 hours in service after the effective date of this AD, unless previously accomplished
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Affected Aircraft
AVCO Lycoming Model O-320-H2AD series engines with serial numbers L-101-76 thru L-1049-76
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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