AD 96-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Wytwornia Sprzetu Komunikacyjnego | 6A4-150-B3 | Airworthiness Directives; Franklin Model 6A4-150-B3 and 6A4-165-B3 Reciprocating Engines |
| engine | Wytwornia Sprzetu Komunikacyjnego | 6A4-165-B3 | Airworthiness Directives; Franklin Model 6A4-150-B3 and 6A4-165-B3 Reciprocating Engines |
Unsafe Condition
Detonation due to low octane can result in severe engine damage and subsequent failure, including damaged intake valves, burned pistons, and excessive loads from detonation.
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Required Actions
Engines certified for 91 octane or higher avgas must undergo a teardown and analytical inspection within 2 hours time in service (TIS) after the effective date, replacing damaged parts. Engines certified for 80 octane avgas must conduct a differential compression test and oil filter examination within 2 hours TIS; teardown and inspection required if metal particles or unacceptable compression are found.
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Compliance Time
within the next 2 hours time in service (TIS) after the effective date of this airworthiness directive (AD)
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Affected Aircraft
Franklin Model 6A4-150-B3 and 6A4-165-B3 reciprocating engines installed on U.S. registered aircraft N6209M, N74231, and N752C.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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