AD 77-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Champion Spark Plug Company | Oil Filters | Airworthiness Directives; CHAMPION SPARK PLUG COMPANY: Applies to Part Numbers CH48108 and CH48109 Oil Filters |
Unsafe Condition
Possible oil filter malfunction resulting from internal bypass valve failure
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Required Actions
Remove all applicable filters from service
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Compliance Time
before further flight
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Affected Aircraft
Champion Spark Plug Company Oil Filters, Part Numbers CH48108 (date codes 1A7E and 2A7C) and CH48109 (date codes 1A7G and 1A7I), except those stamped 'Insp OK 5G7A'
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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