AD 77-20-05 R1

77-20-05 R1 ROLLS-ROYCE LIMITED: Amendment 39-3049 as amended by Amendment 39-4640. Applies to Rolls-Royce DART engines series Mk. 506, 510, 511, 514, 526, 528, 529, 530, 532, and variants, installed on, but not necessarily limited to, BAC Viscount 744 and 745D; Fokker F-27 Mk. 100, 200, 300, 400, 600, 700; Fairchild F-27, -27A, -27B, -27F, -27G, -27J, -27M; Fairchild-Hiller FH-227, -227B, -227C, -227D, - 227E; Armstrong Whitworth Argosy 650, Series 101; Grumman G-159; and Hawker Siddeley HS-748 Series 2A aircraft.

Compliance is required as indicated, unless already accomplished.

1. Compliance for all affected DART engines except the Mk. 530 is based on an effective date of November 3, 1977.

2. Compliance for the DART Mk. 530 engines is based on an effective date of May 12, 1983.

To prevent the failure of the fuel burner feed and manifold pipes that could result in fuel leakage and a fire, accomplish the following:

(a) Inspect the fuel burner feed and manifold pipes and determine if any of the pipes meet both of the following specifications:

(1) The pipe is an "Aeroquip" pipe incorporating Dart Modification 1587 and having one of the following part numbers:

RK.38457A Pipe Assembly - Fuel Feed to No. 4 Burner RK.38455A Pipe Assembly - Fuel Feed to Nos. 1, 2, and 7 Burners RK.38456A Pipe Assembly - Fuel Feed to Nos. 3 and 6 Burners RK.38458A Pipe Assembly - Fuel Feed to No. 5 Burner RK.45363A Fuel Manifold - Assembly No. 5 to F.C.U. Bulkhead Connection

(2) The pipe was manufactured prior to March 1, 1974, and the metal identity tag located around the fireproof sleeve of the pipe (which contains the date of manufacture) has not been marked with -

(i) the marking "DRS.685";

(ii) an engine number or a running time;

(iii) a second date marking in brackets which is later than March 1, 1974; or

(iv) the marking "ZERO."

(b) If, during the inspection required by paragraph (a) of this AD, a pipe is found that meets the specifications contained in paragraph (a) of this AD, before returning the engine to service, inspect the pipe for the presence of corroded, cracked, or broken wires using 5X or 10X magnification in accordance with the instructions contained in paragraphs 4A and 4B of Rolls Royce Dart Service Bulletin Da 73-73, dated August 29, 1975 (hereinafter SB DA 73-73), or an FAA-approved equivalent, and comply with paragraph (c) or (d) of this AD, as applicable.

(c) If, during the inspection required by paragraph (b) of this AD, the pipe wires are found to be corroded, cracked, or broken, before returning the engine to service, replace the pipe with a serviceable pipe or rework in accordance with paragraph 4B(7) of SB Da 73-73, or an FAA-approved equivalent.

(d) If, during the inspection required by paragraph (b) of this AD, the pipe is found to be serviceable, before returning the engine to service, clean and identify the pipe in accordance withparagraphs 4B(4) and 4B(6) of SB Da 73-73, or an FAA-approved equivalent.

(e) The FAA-approved equivalent means of compliance specified in paragraphs (b), (c), and (d) of this AD must be approved by the Manager, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Belgium.

Amendment 39-3049 became effective November 3, 1977.

This Amendment 39-4640 becomes effective May 12, 1983.