Source: https://www.federalregister.gov/documents/2001/09/28/01-24271/airworthiness-directives-rolls-royce-plc-dart-525-525f-528-528d-529-529d-530-532-535-542-and-552
Timestamp: 2018-08-18 03:36:28
Document Index: 459439933

Matched Legal Cases: ['art 525', 'art 525', 'art 525', 'art 525', 'art 525', 'art 525']

Federal Register :: Airworthiness Directives; Rolls-Royce plc Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 Series Turboprop Engines
Airworthiness Directives; Rolls-Royce plc Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 Series Turboprop Engines
A Rule by the Federal Aviation Administration on 09/28/2001
Effective October 15, 2001. Comments for inclusion in the Rules Docket must be received on or before November 27, 2001.
66 FR 49514
49514-49517 (4 pages)
Docket No. 2001-NE-29-AD
Amendment 39-12446
AD 2001-19-06
01-24271
FAA's Determination of an Unsafe Condition and Proposed Actions
Effective Date of this AD
https://www.federalregister.gov/d/01-24271 https://www.federalregister.gov/d/01-24271
This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce plc (RR) Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 series turboprop engines. This action requires the removal of certain part number (P/N) high pressure turbine (HPT) discs and replacement with serviceable discs. This Start Printed Page 49515amendment is prompted by three reports of uncontained HPT disc failures and the manufacturer's investigation into disc failure. The actions specified in this AD are intended to prevent HPT disc failure, which could result in an uncontained engine failure and damage to the airplane.
Submit comments in triplicate to the Federal Aviation Administration (FAA), New England Region, Office of the Regional Counsel, Attention: Rules Docket No. 2001-NE-29-AD, 12 New England Executive Park, Burlington, MA 01803-5299. Comments may also be sent via the Internet using the following address: “9-ane-adcomment@faa.gov”. Comments sent via the Internet must contain the docket number in the subject line. The service information referenced in this AD may be obtained from Rolls-Royce plc, P.O. Box 31 Derby, DE24 8BJ, United Kingdom; telephone 011-44-1332-242424; fax 011-44-1332-249936. This information may be examined 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.
Keith Mead, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (781) 238-7744; fax (781) 238-7199.
The Civil Aviation Authority (CAA), which is the airworthiness authority for the United Kingdom (UK), recently notified the FAA that an unsafe condition may exist on RR Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 series turboprop engines. The CAA advises that three reports of uncontained HPT disc failures have occurred on in-service engines. The results of an investigation reveal that fretting, wear, and open clearance between the HPT disc diaphragm seal arm and intermediate pressure turbine (IPT) disc diaphragm seal arm can result in a high-response disc vibration mode, which results in high-cycle-fatigue (HCF) fractures in the HPT disc. The manufacturer, through testing, has shown that by adding an interference fit between the HPT and IPT seal arms, the discs become effectively preloaded against each other, significantly reducing disc diaphragm vibratory stresses. This condition, if not corrected, could result in HPT disc failure, which could result in an uncontained engine failure and damage to the airplane.
This engine model is manufactured in the UK, and is type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, the CAA has kept the FAA informed of the situation described above. The FAA has examined the findings of the CAA, reviewed all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States.
Since an unsafe condition has been identified that is likely to exist or develop on other Rolls-Royce plc Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 series turboprop engines of the same type design, this AD is being issued to prevent HPT disc failure, which could result in an uncontained engine failure and damage to the airplane. This AD requires the scheduled replacement of HPT discs of the affected design with serviceable discs. The cycles and calendar dates of the replacement schedule are based on risk analysis and the need for owners/operators to have an adequate length of time to accomplish this AD.
Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this action must submit a self-addressed, stamped postcard on which the following statement is made: “Comments to Docket Number 2001-NE-29-AD.” The postcard will be date stamped and returned to the commenter.
End List of Subjects Start Printed Page 49516
2001-19-06 Rolls-Royce plc: Amendment 39-12446. Docket 2001-NE-29-AD.
This airworthiness directive (AD) is applicable to Rolls-Royce Dart 525, 525F, 528-7E, 528D-7E, 529-7E, 529D-7E, 529-7H, 529D-7H, 529-8E, 529D-8E, 529-8H, 529D-8H, 529-8X, 529D-8X, 529-8Y, 529D-8Y, 529-8Z, 529D-8Z, 530, 532-7, 532-7L, 532-7N, 532-7P, 532-7R, 535-2, 535-7R, 542-10, 542-10J, 542-10K, 542-4, 542-4K, 552-2, 552-7, 552-7R series turbofan engines that contain high pressure turbine (HPT) discs having the part numbers listed in the following Table 1:
Table 1.—Part Numbers of Applicable HPT Discs
ARK49431 ARK49434 ARK49437 A.RK50111 A.RK50120
A.RK50121 BRK49431 BRK49434 BRK49437 B.RK50111
B.RK50120 B.RK50121 CRK49431 CRK49434 CRK49437
C.RK50111 C.RK50120 C.RK50121 RK33092 RK33097
RK33099 RK33104 RK33114 RK33117 RK33119
RK33122 RK33125 RK33130 RK33131 RK33214
RK33466 RK33499 RK34206 RK34207 RK34208
RK34209 RK34210 RK34211 RK34212 RK34213
RK34671 RK34674 RK36477 RK36479 RK36481
RK36483 RK36485 RK36487 RK36489 RK36491
RK38592 RK38593 RK38594 RK38595 RK40712
RK40713 RK40714 RK40715 RK40716 RK40717
RK40718 RK40719 RK40720 RK40721 RK40722
RK40723 RK40724 RK40725 RK40726 RK40727
RK43749 RK43750 RK43751 RK44112 RK44113
RK44114 RK44115 RK44116 RK44117 RK44118
RK44119 RK44120 RK44121 RK44122 RK44123
RK44124 RK44125 RK44126 RK44127 RK44310
RK44311 RK44312 RK44328 RK44342 RK44374
RK44397 RK45565 RK46136 RK46485 RK46486
RK46487 RK46488 RK46489 RK46490 RK46491
RK46492 RK46493 RK46494 RK46495 RK46496
RK46497 RK46498 RK46499 RK46531 RK46828
RK48339 RK49121 RK49209 RK49210 RK49211
RK49431 RK49434 RK49437 RK50111 RK50120
RK50121
These engines are installed on, but not limited to BAC Viscount Type 810 aircraft, Fokker F.27 Friendship Mark 200, 400, 500, and 600 series aircraft, Maryland Air Industries, Inc. Fairchild F-27A, F, G, M, J, FH-227, FH-227B, C, D, and E series aircraft, Gulfstream Aerospace Model G-159 aircraft, BAE SYSTEMS (Operations) Limited HS 748 series aircraft, Mitsubishi Heavy Industries, Ltd. YS-11 series aircraft, and Convair CV600/640 series aircraft.
This 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 (d) 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 with this AD is required as indicated, unless already done.
To prevent HPT disc failure, which could result in an uncontained engine failure and damage to the airplane, do the following:
(a) Remove from service the discs listed by part number in Table 1 of this AD, in accordance with the following Table 2 of this AD:
Table 2.—Removal Schedule
(1) Engine is fitted with a listed HPT disc with more than 15,000 cycles since new (CSN) on effective date of this AD Remove from service and replace with a serviceable disc within 300 cycles or before June 30, 2002, whichever occurs earlier.
(2) Engine is fitted with a listed HPT disc that has 12,000 CSN to 15,000 CSN on effective date of this AD Remove from service and replace with a serviceable disc within 600 cycles or before June 30, 2002, whichever occurs earlier.
(3) Engine is fitted with a listed HPT disc that has 9,000 to 11,999 CSN on effective date of this AD Remove from service and replace with a serviceable disc within 900 cycles.
(4) Engine is fitted with a listed HPT disc that has more than 6,000 CSN as of June 30, 2003 Before further flight, remove from service and replace with a serviceable disc.
(5) Engine is fitted with a listed HPT disc as of June 30, 2004 Before further flight, remove from service and replace with a serviceable disc.
Start Printed Page 49517
(b) Remove from service any discs, listed by part number in Table 1 of this AD, from engines that are returned for a shop visit for any reason.
(c) For the purpose of this AD, a serviceable disc is one whose P/N is not listed in Table 1 of this AD. Information on the reworking of affected discs into serviceable discs is specified in Rolls-Royce Dart Service Bulletin Da72-533 Revision 2, dated July 25, 2001.
(d) 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 must submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, ECO.
The subject of this AD is addressed in Civil Airworthiness Authority airworthiness directive AD 007-02-2001, dated April 12, 2001.
(f) This amendment becomes effective on October 15, 2001.
Issued in Burlington, Massachusetts, on September 20, 2001.
[FR Doc. 01-24271 Filed 9-27-01; 8:45 am]