Airworthiness Directive · Amendment 39-9489 · Wytwornia Sprzetu Komunikacyjnego Engines
Wytwornia Sprzetu Komunikacyjnego Engines
This AD applies to Wytwornia Sprzetu Komunikacyjnego 6A4-150-B3, 6A4-165-B3.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD) that is applicable to Franklin Model 6A4-150-B3 and 6A4-165-B3 reciprocating engines, installed on the following U.S. registered aircraft: N6209M, N74231, and N752C. This action supersedes priority letter AD 94-14-11 that currently requires engines certified to operate on 91 octane or higher avgas to undergo a teardown and analytical inspection for detonation damage, and engines certified to operate on 80 octane avgas to undergo inspection for evidence of possible internal engine damage. This action revises incorrect engine model numbers listed in the priority letter AD. This amendment is prompted by updated information that has identified the correct engine model numbers. The actions specified by this AD are intended to prevent detonation due to low octane, which can result in severe engine damage and subsequent failure.
