Airworthiness directives › 2022-10-02
AD 2022-10-02 Airworthiness Directives; Honeywell International, Inc. (Type Certificate Previously Held by AlliedSignal, Inc. and Textron Lycoming) Turboshaft Engines
Makes named: lycoming. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Honeywell International, Inc. (Type Certificate previously held by AlliedSignal, Inc. and Textron Lycoming) T5311A, T5311B, T5313B, T5317A, T5317A-1, T5317B, T5317BCV, and former military T53-L-11, T53-L-11A, T53-L-11B, T53-L-11C, T53-L-11D, T53-L-11A S/SA, T53-L-13B, T53-L-13B S/SA, T53-L-13B S/SB, and T53-L-703 model turboshaft engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 100 flight hours (FHs) after the effective date of this AD, or before further flight for a newly installed engine or newly installed reduction gearbox assembly, perform an initial special vibration test of the engine using the service information, as applicable to the engine model, listed in Table 1 to paragraph (g)(1) of this AD. BILLING CODE 4910-13-P ER24MY22.000 BILLING CODE 4910-13-C (2) Thereafter, within the following compliance times, perform repetitive special vibration tests of the engine: (i) For engines that have tachometer drive spur gear part number (P/N) 1-070-062-04 installed, perform a repetitive special vibration test before exceeding 500 FHs since the last special vibration test. (ii) For engines that have tachometer drive spur gear P/N 1-070-062-06 installed, perform a repetitive special vibration test before exceeding 1,000 FHs since the last special vibration test. (3) If, during any special vibration test required by paragraph (g)(1) or (2) of this AD, an engine exceeds the 0.2 inches per second (IPS) limit for any peak RPM/frequency bands, before further flight, remove the reduction gearbox assembly or the engine from service.
Unsafe condition
This AD was prompted by reports of tachometer drive spur gear failure, resulting in potential engine overspeed, loss of power turbine speed (N2) instrument panel indication, and hard landings. The FAA is issuing this AD to prevent excessive vibrations produced by the reduction gearbox assembly that could cause failure of the tachometer drive spur gear. The unsafe condition, if not addressed, could result in failure of the engine, loss of thrust control, and damage to the aircraft.
Affected ADs
This AD replaces AD 2002-03-01, Amendment 39-12642 (67 FR 6857, February 14, 2002).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1