AD 72-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | HIO-360-D1A | AVCO LYCOMING Model HIO-360-D1A Engines |
Unsafe Condition
Possible failures of the Bendix S4LN-1208 magnetos, P/N 10-349285-5
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Required Actions
Inspect and lubricate the magneto distributor bushing of both magnetos within the next 50 hours time in service and every 50 hours thereafter per Lycoming SB 336B or equivalent. Replace left magneto parts with Bendix Kit No. 10-391320 or equivalent FAA-approved parts within the next 100 hours time in service and every 100 hours thereafter.
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Compliance Time
Within the next 50 hours time in service and at each 50 hours time in service thereafter (for inspection/lubrication) and within the next 100 hours time in service and at each 100 hours time in service thereafter (for part replacement).
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Affected Aircraft
AVCO Lycoming Model HIO-360-D1A engines installed on Hughes Model 269C and 300C helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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