Commonwealth legislation

AD/T53/19 - N2 Accessory Drive

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

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This airworthiness directive requires operators of AlliedSignal (Lycoming) T53-series engines to remove N2 spur gear nut retainers (lock cups) P/N 1-070-066-01 and follow the listed AlliedSignal service bulletins to prevent possible uncommanded engine acceleration (Requirement; Background). Operators pay for and perform the replacement; compliance is mandatory within 300 flight hours or by 17 July 1999, as required by the Civil Aviation Safety Authority (Compliance).

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AD/T53/19 - N2 Accessory Drive

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AlliedSignal (Lycoming) Turbine Engines - T53 Series

AD/T53/19 N2 Accessory Drive 8/97

Applicability: AlliedSignal (formerly Textron Lycoming) T5311, T5313, T5317, T53-L-11, T53-L- 13 and T53-L-703 series engines.

Requirement: To prevent possible uncommanded engine acceleration resulting from N2 accessory drive assembly disengagement, remove from service N2 spur gear nut retainers (lock cups) part number (P/N) 1-070-066-01 in accordance with the following AlliedSignal Aerospace Service Bulletins (SB):

1: T5311 and T53-L-11 series engines: 2: T5313B and T5317 series engines: 3: T53-L-13B/SSA/SSB series engines: 4: T53-L-13B/SSD series engines:

5: T53-L-703 series engines:

SB No. T5311/T53-L-11-0080.

SB No. T5313B/T5317-0081 Revision 1. SB T53-L-13B-0082 Revision 1

SB T53-L-13B/D-0083.

SB T53-L-703-0084 Revision 1.

Note: FAA Airworthiness Directive 97-07-05 refers.

Compliance: Within 300 hours time in service or prior to 17 July 1999, whichever occurs first.

This airworthiness directive becomes effective on 17 July 1997.

Background: This directive has been issued to require the removal from service of certain part number N2 spur gear nut retainers in response to reports of N2 spur gear retainer separation. Separation of the retainer could result in N2 accessory drive disengagement and uncommanded engine acceleration.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/T53/19 - N2 Accessory Drive