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2000-12-18 Rolls Royce Ltd.: Amendment 39-11796, Docket No. 99-NE-50-AD.
Applicability
This AD is applicable to Rolls-Royce Ltd. (R-R) Dart 511, 511-7E, 514-7, 528, 528-7E, 529-7E, 532-7, 532-7L, 532-7N, 532-7P, 532-7R, 535-7R, 551-7R, and 552-7R turboprop engines. These engines are installed on but not limited to Fokker Aircraft B.V. F27 series and Maryland Air Industries (formerly Fairchild) F-27 and FH-227 series airplanes.
Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
Compliance
Compliance with this AD is required as indicated below, unless already completed.
To prevent a propeller from overspeeding, resulting in propeller release after a failure of the annulus gear, which could result in damage to an adjacent engine or to the airplane, do the following:
Installation of a Sensor Probe and Retaining Ring
(a) At the next shop visit after the effective date of this AD, or by December 31, 2000, whichever occurs first, do all of the following:
(1) Install a feathering probe in the front bearing panel of the reduction gearbox in accordance with paragraph 2.A. of service bulletin (SB) Da72-348, revision 13, dated April 13, 1999.
(2) Install a steel retaining ring between the nose casing and the front bearing panel in accordance with paragraph 2.C. of SB Da72-348, revision 13, dated April 13, 1999.
(3) Replace the existing transfer bobbin with an aluminum bobbin in accordance with paragraph 2.C. of SB Da72-348, revision 13, dated April 13, 1999.
Definition of a Shop Visit
(b) For the purposes of this AD, a shop visit is defined as any maintenance action that results in the removal or disassembly of the reduction gearbox.
Alternative Method of Compliance
(c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office (ECO). Operators shall submit their request through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, ECO.
Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the ECO.
Special Flight Permits
(d) Special flight permits may be issued in accordance with 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished.
Documents Incorporated by Reference
(e) The inspection shall be done in accordance with the following Rolls-Royce service bulletin:
Document No.
Pages
Revision
Date
Da72-348
1 2, 2A/2B
13
April 1999
3
7
August 22, 1969
4-7
Original
December 24, 1968
(The original service bulletin omitted page 8.)
9
11
July 10, 1970
9A
11
July 10, 1970
10 12
11
July 10, 1970
12A 12B
11
July 10, 1970
13
11
July 10, 1970
14 16
Original
December 24, 1968
17
4
May 16, 1969
18 19
Original
December 24, 1968
20 20A
10
January 23, 1970
21
6
July 11, 1969
22
Original
December 24, 1968
23
11
July 10, 1970
24
Original
December 24, 1968
25 26
13
April 1999
Supplement
1-2
Original
February 7, 1969
Total pages: 32
This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Rolls-Royce Limited, Attn: Dart Engine Service Manager, East Kilbride, Glasgow G74 4PY, Scotland; telephone: 011-44-1355-220-200, fax: 011-44-1141-778-432. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC.
Effective Date of this AD
(f) This amendment becomes effective July 31, 2000.
