AD 92-25-11

92-25-11 BRITISH AEROSPACE: Amendment 39-8425. Docket No. 92-NM-153-AD.

Applicability: All Model DH/BH/HS/BAe 125 series airplanes, excluding Model BAe 125-1000A, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent rupture of the hydraulic accumulator, failure of one or more hydraulic systems, fire in the tailcone area, and possible structural damage to the aft fuselage, accomplish the following:

(a) Within 6 months after the effective date of this AD, accomplish paragraphs (a)(1) and (a)(2) of this AD, in accordance with British Aerospace Service Bulletin SB.29-89-3269A, dated May 22, 1992.

(1) Install a placard on the hydraulic box front cover, stating that accumulators must be charged with nitrogen.

(2) Review the airplane maintenance records to confirm that the hydraulic accumulators are charged with nitrogen. If these records do not indicate that the accumulators are charged with nitrogen, prior to further flight, discharge the accumulators and recharge them with nitrogen.

(b) 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, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(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) The installation of the placard and the review, discharge and recharge of the accumulator shall be done in accordance with British Aerospace Service Bulletin SB.29-89-3269A, dated May 22, 1992. (NOTE: The issue date of that service bulletin is indicated only on "Page 1 of 7"; no other page of the document is dated.) 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, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, DC 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(e) This amendment becomes effective on January 12, 1993.