92-07-04 BRITISH AEROSPACE (BAe), REGIONAL AIRCRAFT LIMITED: Amendment 39-8200. Docket No. 91-CE-61-AD. Supersedes AD 90-02-14, Amendment 39- 6434.
Applicability: HP 137 Mk1, Jetstream Models 200, 3101, and 3201 airplanes (all serial numbers), certificated in any category.
Compliance: Required as indicated, unless already accomplished.
To prevent landing gear or flap extension malfunction during operation of the emergency hydraulic system, accomplish the following:
(a) Within the next 600 hours time-in-service (TIS) after February 5, 1990 (the effective date of AD 90-02-14, Amendment 39-6434), modify the detent ball catch of the emergency gear and flap extension hydraulic system selector valve in accordance with the instructions in BAe Alert Service Bulletin (SB) 29-A-JA881143, dated February 24, 1989.
(b) Upon the accumulation of 1,600 hours TIS, or within the next 200 hours TIS after the effective date of this AD, whichever occurs later, and thereafter atintervals not to exceed 1,800 hours TIS, accomplish the following:
(1) Modify the emergency gear and flap extension hydraulic system valve in accordance with paragraphs A.(1) through A.(5) of the "ACCOMPLISHMENT INSTRUCTIONS" in BAe SB 29-JA 901242, dated June 18, 1991, Revision 1, dated September 25, 1991.
(2) Measure for excessive torque in accordance with paragraphs A.(1) through A.(3) of the "ACCOMPLISHMENT INSTRUCTIONS" in AP Precision Hydraulics Ltd. SB 8679-29-02, dated April 1991, Revision 1, dated August 1991.
(i) If torque is not found excessive in accordance with paragraph A.(4) of the "ACCOMPLISHMENT INSTRUCTIONS" in AP Precision Hydraulics Ltd. SB 8679-29-02, dated April 1991, Revision 1, dated August 1991, prior to further flight, release the safety catch and perform paragraphs A.(7) through A.(10) of the "ACCOMPLISHMENT INSTRUCTIONS" in BAe SB 29-JA 901242, dated June 18, 1991, Revision 1, dated September 25, 1991.
(ii) If excessive torque is found in accordance with paragraph A.(4) of the "ACCOMPLISHMENT INSTRUCTIONS" in AP Precision Hydraulics Ltd. SB 8679-29-02, dated April 1991, Revision 1, dated August 1991, prior to further flight, recondition the selector valve as specified in paragraph A.(5) of the "ACCOMPLISHMENT INSTRUCTIONS" in AP Precision Hydraulics Ltd. SB 8679-29-02, dated April 1991, Revision 1, dated August 1991, release the safety catch, and perform paragraphs A.(7) through A.(10) of the "ACCOMPLISHMENT INSTRUCTIONS" in BAe SB 29-JA 901242, dated June 18, 1991, Revision 1, dated September 25, 1991.
(c) 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.
(d) An alternative method of compliance or adjustment of the compliance times that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Office, FAA, Europe, Africa, and Middle EastOffice, c/o American Embassy, B- 1000 Brussels, Belgium. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Office.
(e) The inspections and modifications required by this AD shall be done in accordance with BAe Alert Service Bulletin 29-A-JA881143, dated February 24, 1989; BAe Service Bulletin 29-JA 901242, which incorporates the following pages:
Pages
Level
Date
2, 3, 5, and 6
Original
June 18, 1991
1 and 4
Revision 1
September 25, 1991;
and AP Precision Hydraulics Ltd. Service Bulletin 8679-29-02, which incorporates the following pages:
Pages
Level
Date
1, 2, and 3
Original
April 1991
4
Revision 1
August 1991
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 British Aerospace, Regional Aircraft Limited, Manager Product Support, Prestwick Airport, Ayrshire, KA9 2RW Scotland; or British Aerospace, Inc., Librarian, Box 17414, Dulles International Airport, Washington, DC, 20041; and AP Precision Hydraulics Ltd., P.O. Box 1, Shaw Road, Speke, Liverpool, England, L24 9JY. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 1100 L Street, NW; Room 8401, Washington, DC.
(f) This amendment (39-8200) supersedes AD 90-02-14, Amendment 39-6434.
(g) This amendment (39-8200) becomes effective on April 30, 1992.