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Airworthiness Directive 2005-04-10

one-time
Official AD 2005-04-10 · FR doc 05-3190 · 2005-02-22 · turboshaft engine

Airworthiness Directives; General Electric Company CT58 Series and Surplus Military T58 Series Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for General Electric Company (GE) CT58-140-1, CT58-140-2, and surplus military T58-GE-5, -10, -100, and -402 turboshaft engines with certain serial numbers (SNs) of stage 1 compressor disks, part number (P/N) 5001T20P01, installed. This AD requires removing certain stage 1 compressor disks from service before reaching a reduced low-cycle- fatigue (LCF) life limit for those affected disks of 2,100 hours time- since-new (TSN) or by December 31, 2008, whichever occurs first. This AD results from two reports of low blade tip clearances in the compressor. We are issuing this AD to prevent LCF cracking and failure of the stage 1 compressor disk, an uncontained engine failure, and damage to the helicopter.

Which aircraft AD 2005-04-10 applies to

MakesGeneral Electric
ModelsCT58-140-1, CT58-140-2, T58-GE-5, T58-GE-10, T58-GE-100, T58-GE-402, CT58
Part-conditional — 5001T20P01.

Applies when stage 1 compressor disk P/N 5001T20P01 with a serial number listed in AD Table 1 (approx. 250 specific serial numbers, e.g. GATD0PD2 through GATH96J0) is installed. Installed on, but not limited to, Agusta S.p.A. AS-61N and AS-61N1; Sikorsky S-61L, S-61N, S-61R, and S-61NM helicopters; and surplus military helicopters certificated under 14 CFR 21.25/21.27 (Sikorsky S-61D and S-61V, Glacier CH-3E, Siller CH-3E and SH-3A, and Robinson Crane CH-3C, CH-3E, HH-3C, HH-3E, and Carson S-61L helicopters).

Whether AD 2005-04-10 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 2005-04-10 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.