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Airworthiness Directive 2008-26-02

recurring
Official AD 2008-26-02 · FR doc E8-29722 · 2008-12-22 · turboshaft engine

Airworthiness Directives; General Electric Company (GE) CT7-8A Turboshaft Engines

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for certain GE CT7-8A turboshaft engines. That AD currently requires initial and repetitive inspections of the electrical chip detectors for the No. 3 bearing. This AD requires removing from service certain GE CT7-8A turboshaft engines within 6,200 cycles-since-new. This AD results from investigation for the root causes of two failures of the No. 3 bearing. We are issuing this AD to prevent failure of the No. 3 bearing due to contamination by aluminum oxide, which could result in a possible in-flight shutdown of the engines and loss of control or forced landing of the aircraft.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2008-26-02 applies to

MakesGeneral Electric
ModelsCT7-8A, CT7
Serial-conditional — narrows to serials 947205–947212, 947214–947215, 947217–947221, 947223–947223, 947225–947225, 947228–947228, 947230–947230, 947232–947233, 947235–947235, 947238–947238, 947240–947245, 947247–947250, 947253–947256, 947258–947258, 947260–947263, 947265–947265, 947274–947274, 947277–947280, 947284–947285.

Applies only to engines with a serial number listed in Table 1 of the AD. Installed on, but not limited to, Sikorsky S92 helicopters.

Whether AD 2008-26-02 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:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 2008-26-02 complied with on your aircraft?

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.