Commonwealth legislation

AD/JT15D/7 Amdt 2 - Fan Blade Rub

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires operators of Pratt & Whitney Canada JT15D‑4, ‑4B and ‑4D engines (unless they have incorporated PWC Service Bulletin 7268 or 7300) to inspect the low‑pressure compressor case for fan blade rub. If rub is found, it mandates blade tip‑clearance adjustment per the PWC manual, a fluorescent penetrant inspection by a holder of an NDT Authority, and replacement of the low compressor case if cracked.

Compliance is required within 25 hours time in service and then every 300 hours, creating inspection, certified NDT and potential replacement costs for affected operators.

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AD/JT15D/7 Amdt 2 - Fan Blade Rub

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Pratt and Whitney Canada Turbine Engines - JT15D Series

AD/JT15D/7

Amdt 2

Fan Blade Rub 3/93

Applicability: JT15D-4, -4B, -4D engines not incorporating Pratt and Whitney Canada Service Bulletin No. 7268 or 7300.

Requirement: Inspect the low pressure compressor case inner diameter for evidence of fan blade rub.

If fan blade rub is evident:

Carry out a fan blade tip clearance check in accordance with PWC M/M P/N 3017542, chapter 72-30-53 and adjust as required.

2. Carry out a fluorescent penetrant inspection of the rub area.

3. If cracking of the low compressor case is evident, replace the low compressor case.

Note 1: A fluorescent penetrant inspection shall be carried out by the holder of a valid NDT Authority.

Note 2: Transport Canada Directive CF-88-03R1 refers.

Compliance: Effective 4 March 1993; unless previously accomplished, within 25 hours time in service and thereafter at intervals not to exceed 300 hours time in service.

Background: This Directive has been amended to reflect the issue of PWC SB No. 7300. Engines incorporating a vibration damper ring as detailed in SB 7268 or 7300 are no longer applicable.

Source text

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

1 AD/JT15D/7 Amdt 2 - Fan Blade Rub