Commonwealth legislation

AD/RRT-S/14 - LPT Stage 2 NGV Seal Support

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

Requires operators of specified Rolls‑Royce Spey 555‑15 series engines to modify the low‑pressure turbine (LPT) stage 2 nozzle guide vane (NGV) seal supports by incorporating Modification No. 6421 in accordance with Rolls‑Royce Service Bulletin Sp72‑1063. It affects owners/operators of the listed engine models, who must complete the mandated work by 30 June 2003 to prevent heavy rubbing between the NGV seal assembly and LPT disc seals that can damage disc drive arms.

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AD/RRT-S/14 - LPT Stage 2 NGV Seal Support

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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 Rolls Royce Turbine Engines - Spey Series

AD/RRT-S/14 LPT Stage 2 NGV Seal Support 10/99

Applicability: Rolls Royce Spey 555-15, -15/10, -15H,.-15H/10, -15N, -15N/12, .-15N/20, -15P,

-15P/12, and -15P/20 engines.

Requirement: Modify affected LPT Stage 2 NGV Seal Supports by incorporating Modification No 6421 in accordance with Rolls Royce Service Bulletin Sp72-1063.

Note: CAA (UK) AD 007-05-99 also refers.

Compliance: No later than 30 June 2003.

This Airworthiness Directive becomes effective on 7 October 1999.

Background: Heavy rubbing can occur between the LP turbine stage 2 nozzle guide vane support ring seal assembly and the LP turbine discs seals. In extreme cases the disc drive arms can be damaged.

Source text

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