92-02-02 BRITISH AEROSPACE: Amendment 39-8138. Docket 91-NM-203-AD. Supersedes AD 90-21-12, Amendment 39-6764.
Applicability: Model ATP series airplanes, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent reduced structural integrity of the fuselage, accomplish the following:
(a) Within 50 hours time-in-service after October 29, 1990 (the effective date of AD 90-21-12, Amendment 39-6764), and thereafter at intervals not to exceed 50 hours time-in-service, apply an icing inhibitor to the propeller blades in accordance with British Aerospace Service Bulletin ATP-61-2, Revision 1, dated October 31, 1989, or Revision 2, dated October 25, 1990, or Revision 3, dated April 19, 1991.
(b) Installation of Modification 10129A (installation of ice guards on both the left and right sides of the fuselage) in accordance with British Aerospace Service Bulletin ATP-53-10, dated March 7, 1990; or installation of Modification 10174A (installation of a new propeller digital ice control timer unit and a new propeller blade and roller assembly) in accordance with British Aerospace Service Bulletin ATP-30-13, Revision 1, dated February 15, 1991, constitutes terminating action for the repetitive applications of icing inhibitor to the propeller blades as required by paragraph (a) of this AD.
(c) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.
NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.
(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.
(e) Theicing inhibitor application requirements of this AD must be done in accordance with British Aerospace Service Bulletin ATP-61-2, Revision 1, dated October 31, 1989; or Revision 2, dated October 25, 1990; or Revision 3, dated April 19, 1991; which include the following list of effective pages:
Service Bulletin
Page number
Revision Level
Date
ATP-61-2, Revision 1
1
1
October 31, 1989
2, 3
(Original)
July 29, 1989
ATP-61-2, Revision 2
1, 2, 3
2
October 25, 1990
ATP-61-2, Revision 3
1, 2
3
April 19, 1991
3
2
October 25, 1990
The modifications specified in this AD must be done in accordance with British Aerospace Service Bulletin ATP-53-10, dated March 7, 1990 (for Modification 10129A); and British Aerospace Service Bulletin ATP-30-13, Revision 1, dated February 15, 1991 (for Modification 10174A). 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 maybe obtained from British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.
(f) This amendment (39-8138), AD 92-02-02, becomes effective on April 13, 1992.