Commonwealth legislation

AD/JT8D/4 - Sixth Stage Compressor Disc and Blades

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires borescope inspection of the rear of sixth-stage compressor blade dovetail roots and disc slots on JT8D engines that use discs P/Ns 483506, 494906 or 586906; any cracked blade or disc must be removed from service before further flight. Inspections must occur at intervals not exceeding 500 hours TIS after 31 August 1970; alternatively an operator may comply with AD/PW-T/27A. Pratt & Whitney SB No.1133 Rev.3 describes adding borescope ports. Operators and maintenance organisations pay for inspections, casing modifications and part removals; the regulator sets the mandatory interval and removal requirement.

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AD/JT8D/4 - Sixth Stage Compressor Disc and Blades

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/4 Sixth Stage Compressor Disc and Blades 8/70

Applicability: All JT8D series engines incorporating sixth stage compressor discs P/Ns 483506, 494906 and 586906.

Requirement: 1. Using a suitable borescope, inspect the rear of the sixth stage compressor blade dovetail roots and disc slots for any evidence of cracking. Any sixth stage compressor blade or disc found cracked shall be removed from service before further flight.

Note: Pratt & Whitney SB No. 1133, Rev. 3 gives details of a modification for incorporating suitable borescope inspection ports in the compressor casing.

AD/PW-T/27A.

Compliance: At intervals not exceeding 500 hours time in service, after 31 August 1970.

Source text

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