93-14-05 BRITISH AEROSPACE: Amendment 39-8629. Docket 92-NM-138-AD. Supersedes AD 77-17-10 R2, Amendment 39-4713.
Applicability: All Model BAC 1-11-200 and -400 series airplanes, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent unannunciated failure of the wing flap secondary drive shafts, accomplish the following:
(a) Within 300 hours time-in-service after the effective date of this AD, unless previously accomplished within the last 900 hours time-in-service prior to the effective date of this AD: Open the left and right spoilers and perform an inspection, visually (detailed visual inspection) and by feel, of the visible wing flap secondary drive shafts to detect failure or damage, in accordance with paragraph 2.4 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 4, dated May 6, 1991. Prior to further flight, repair or replace any defective shafts in accordance with paragraphs (c)(2) and (e) of this AD.
(b) Within 1,200 hours time-in-service after the effective date of this AD: Perform a general visual inspection of all wing flap secondary drive shafts to detect failure or damage, in accordance with paragraph 2.1 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981, or paragraph 2.1.2 of Issue 4, dated May 6, 1991.
(1) Repeat the general visual inspections thereafter at intervals not to exceed 1,200 hours time-in-service.
(2) If any shaft is found that is distorted or chafed, prior to further flight, perform an inspection of that shaft, visually (detailed visual inspection) and by feel, in accordance with paragraph 2.4 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981, or Issue 4, dated May 6, 1991. Shafts that fail to meet the inspection specifications listed in paragraph 2.4 of the service bulletin must be replaced,prior to further flight, in accordance with paragraph 2.4.1 of the service bulletin.
(c) For spanwise wing flap secondary drive shafts between wing station 0 and wing rib 14: Prior to the accumulation of 3,600 total hours time-in-service or within the next 1,200 hours time-in-service after the effective date of this AD, whichever occurs later, perform an inspection, visually (detailed visual inspection) and by feel, to detect failure or damage, in accordance with paragraph 2.4 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981, or Issue 4, dated May 6, 1991.
(1) Repeat the inspection thereafter at the times specified in paragraphs (c)(1)(i) and (c)(1)(ii) of this AD:
(i) For spanwise wing flap secondary drive shafts that have accumulated less than 24,000 total hours time-in-service: At intervals not to exceed 3,600 hours time-in-service or 24 months, whichever occurs earlier.
(ii) For spanwise wing flap secondary drive shafts that have accumulated 24,000 or more hours time-in-service: At intervals not to exceed 2,400 hours time-in-service or 24 months, whichever occurs earlier.
(2) Shafts that fail to meet the specifications listed in paragraph 2.4 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981, or Issue 4, dated May 6, 1991, must be replaced, prior to further flight, in accordance with paragraph 2.4.1 of the service bulletin.
(d) For wing flap secondary drive shafts located between wing station 0 and wing rib 14, listed in Appendix 1 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 4, dated May 6, 1991, on which Modification PM5341/HCA929 is applicable, but has not been accomplished: Prior to the accumulation of 30,000 total hours time-in-service, or within 1,000 hours time-in-service after the effective date of this AD, whichever occurs later; overhaul and modify the wingflap secondary drive shafts by installing British Aerospace Modification PM5341, in accordance with paragraph 2.3 of British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981, or Issue 4, dated May 6, 1991. At overhaul, the shaft tubing must be replaced with Modification PM5341 improved tubing, but serviceable end fittings may be reused.
(e) Whenever replacing or repairing a flap secondary drive shaft in accordance with paragraph (a), (b) or (c) of this AD, or whenever overhauling a wing flap secondary drive shaft in accordance with paragraph (d) of this AD, inspect the adjacent shaft support bearings for excessive radial play, in accordance with Section 27-52-00 of the BAC 1-11 Maintenance Manual. Prior to further flight, replace any shaft support bearings having radial play in excess of 0.020 inch total indicated reading with a serviceable bearing.
(f) Operators who have not kept records of hours time-in-service on individualwing flap secondary drive shafts shall substitute airplane hours time-in-service in lieu thereof.
(g) 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.
(h) 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.
(i) The inspections, replacement, overhaul, and modification shall be done in accordance with British Aerospace BACOne-Eleven Alert Service Bulletin 27-A-PM5341, Issue 3, dated September 28, 1981; and British Aerospace BAC One-Eleven Alert Service Bulletin 27-A-PM5341, Issue 4, dated May 6, 1991; as applicable. 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.
(j) This amendment becomes effective on August 23, 1993.