Airworthiness Directive 2004-07-09
one-timeAirworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines
What this AD requires
The FAA is superseding an existing airworthiness directive (AD) for certain General Electric Aircraft Engines (GEAE) CT7 series turboprop engines. That AD currently requires propeller gearbox (PGB) oil filter impending bypass button (IBB) inspections, oil filter inspections, replacement of left-hand and right-hand idler gears at time of PGB overhaul, and replacement of certain serial number (SN) PGBs before accumulating 2,000 flight hours. This AD requires the same actions, and adds additional SNs of affected PGBs. This AD results from reports of PGBs equipped with certain gears that do not meet design specifications, resulting in the same failure addressed in the existing AD. We are issuing this AD to prevent separation of PGB left-hand and right-hand idler gears, which could result in uncontained PGB failure and internal bulkhead damage, possibly prohibiting the auxiliary feathering system from fully feathering the propeller on certain PGBs.
Which aircraft AD 2004-07-09 applies to
Applies only to CT7 series turboprop engines with propeller gearboxes (PGBs) identified by serial number in Table 1 of GEAE SB CT7-TP S/B 72-0452 (dated July 27, 2001) and Table 1 of ASB CT7-TP S/B 72-A0466 (dated April 17, 2003).
Whether AD 2004-07-09 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.