2003-17-11: Sermetel coating (Omat 7/46)

2003-17-11 Rolls-Royce Deutschland Ltd & Co KG: Amendment 39-13286. Docket No. 2003-NE-10-AD. Effective Date (a) This AD becomes effective September 30, 2003. Affected ADs (b) None. Applicability (c) This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) (formerly Rolls-Royce plc) Dart 528-7E, 529-7H, -7E, -8E, -8H, -8X, -8Y, -8Z, 529D-7E, -7H, -8E, -8H, -8X, -8Y, -8Z, 531, 532-2L, -7, -7N, -7P, -7L, -7R, 535-2, -7R, 542-4, -4K, -10, -10J, - 10K, 552-2, 552-7, and -7R turboprop engines with a high pressure (HP) turbine disc or intermediate pressure (IP) turbine disc that has a serial number (SN) listed in Table 1 of this AD installed. These engines are installed on, but not limited to, BAE Systems (Operations) Limited, Model HS 748 Series 2A and 2B airplanes, Fokker Aircraft B.V., F.27 Friendship Mark 200, 400, 500, and 600 airplanes, Gulfstream Aerospace Corporation Model G-159"Gulfstream I" airplanes, Maryland Air Industries, Inc. F-7F, F-27A, F-27G, F- 27J, F-27M, FH-227B, FH-227C, FH-227D, and FH-227E airplanes, and Mitsubishi Heavy Industries, Ltd Model YS-11, YS-11A-200, YS-11A- 300, YS-11A-500, and YS-11A-600 airplanes. Table 1 follows: Turbine disc serial number Turbine disc stage Date when coating was applied Turbine disc cycles-since- new when coating was applied DETN128 HP 31. Mar 01 4356 DETN155 HP 22. Jun 99 0 DETN3541 HP 17. Apr 01 2850 DETN3542 HP 16. Jan 01 6053 LA759 HP 27. Oct 00 5858 LP219 HP 23. Nov 99 6688 LW376 HP 21. Jul 99 3302 LX484 HP 22. Feb 00 4632 LZ299 HP 23. Dec 99 5839 LZ404 HP 13. Jul 01 630 LZ555 HP 30. Aug 00 2158 LZ564 HP 15. Mar 01 4204 SG612 HP 20. Apr 00 5735 SH195 HP 16. Dec 99 5349 DETN25 IP 30. Aug 00 2158 DETN238 IP 31. Mar 01 4356 DETN240 IP 18. Apr 01 0 DETN944 IP 04. Mar 00 2200 DETN2666 IP 17. Apr 01 2850 DETN5538 IP 16. Jul 01 630 DETN6400 IP 14. Apr 99 0 LA407 IP 22. Jun 00 5736 LA858 IP 27. Oct 00 5858 LB99 IP 13. Aug 99 9093 LE284 IP 24. Dec 99 5679 LN87 IP 10. May 99 5829 LP519 IP 23. Nov 99 6688 LW517 IP 22. Dec 99 5865 LX214 IP 09. Dec 00 6498 LX379 IP 22. Feb 00 4632 LZ248 IP 23. Dec 99 5839 LZ385 IP 17. Oct 01 9072 LZ603 IP 22. Jun 99 0 SG554 IP 20. Apr 00 5735 SH863 IP 16. Dec 99 5349 Unsafe Condition (d) This AD is prompted by reports of Sermetel coating (Omat 7/ 46) applied to certain turbine discs which, if allowed to remain on the discs would react adversely with the disc dry film lubricant, causing uncontained HP or IP turbine disc failure, which could result in damage to the airplane. We are issuing this AD to prevent HP or IP turbine disc failure, which could result in damage to the airplane. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Determining if Action Is Required (f) Within 60 days after the effective date of this AD, determine the SN of the HP turbine disc and the IP turbine disc. If none of the HP and IP turbine discs with SNs listed in Table 1 are installed in the engine, no further action is required. (g) If one or more of the discs with SNs listed in Table 1 of this AD are installed in the engine, do the following: (1) If the engine has had a full overhaul of the turbine after the shop visit at which the Sermetel coating (Omat 7/46) was applied, no further action is required. (2) If only the HP turbine disc is listed in Table 1, and the engine has RRD Service Bulletin No. Da72-533, Revision 3, dated October 2001, incorporated, no further action is required. Removal of Sermetel Coating and Disc Inspection (3) Before accumulating 10,000 flight cycles since the coating was applied, completely remove Sermetel coating (Omat 7/46) from HP turbine discs and LP turbine discs. Information on coating removal can be found in RRD Overhaul Processes Manual, Overhaul Process 114. (4) Visually inspect HP turbine discs and LP turbine discs, and return to service discs that pass inspection. Information on disc pass or fail inspection criteria can be found in the RRD Engine Overhaul Manual, Chapter 72-6-1. Alternative Methods of Compliance (h) Alternative methods of compliance must be requested in accordance with 14 CFR part 39.19, and must be approved by the Manager, Engine Certification Office, FAA. Material Incorporated by Reference (i) None. Related Information (j) The subject of this AD is addressed in LBA airworthiness directive LTA 2003-015, dated February 6, 2003.