93-16-03 BRITISH AEROSPACE: Amendment 39-8660. Docket 93-NM-23-AD.
Applicability: Model BAe 146 airplanes, as listed in British Aerospace BAe 146 Inspection Service Bulletin S.B. 27-135, dated April 23, 1992, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent adverse airplane flight characteristics during autopilot operation, accomplish the following:
(a) Within 60 days after the effective date of this AD, perform a visual inspection of the autopilot pitch servomotor mounting to identify the part number on the dataplate in accordance with British Aerospace BAe 146 Inspection Service Bulletin S.B. 27-135, dated April 23, 1992.
(b) If the part number is 209RAA6-135CAF (for Model BAe 146-100A and -200A series airplanes) or 209RAA6-175ABC (for Model BAe 146-300A series airplanes), prior to further flight, perform a visual inspection of the position of the foul pin holes in the mounting bracket in accordance with British Aerospace BAe 146 Inspection Service Bulletin S.B. 27-135, dated April 23, 1992.
(1) If the foul pin holes align with foul pin hole positions "CAF" (for Model BAe 146-100A and -200A series airplanes) or "ABC" (for Model BAe 146-300A series airplanes) on the mounting bracket, no further action is required by this AD.
(2) If the foul pin holes do not align with foul pin hole positions "CAF" (for Model BAe 146-100A and -200A) or "ABC" (for Model BAe 146-300A series airplanes) on the mounting bracket, accomplish the requirements of paragraphs (b)(2)(i) and (b)(2)(ii) of this AD.
(i) Prior to further flight, perform a torque check of the autopilot pitch servomotor mounting in accordance with the service bulletin to ensure that the slip torque corresponds to the values specified in the service bulletin. If the autopilot pitch servomotor mounting slip torque does not correspond to the values specified in the service bulletin, prior to further flight, remove the autopilot pitch servomotor mounting and install a serviceable autopilot pitch servomotor mounting having the correct slip torque in accordance with the service bulletin.
(ii) Within 12 months after the effective date of this AD, modify the mounting bracket and reposition the foul pins on the servomotor mounting in accordance with the service bulletin.
(c) If the part number is not 209RAA6-135CAF (for Model BAe 146-100A and -200A series airplanes) or 209RAA6-175ABC (for Model BAe 146-300A series airplanes), prior to further flight, remove the autopilot pitch servomotor and servomotor mounting, modify the mounting bracket, and install an autopilot pitch servomotor and servomotor mounting having part number 209RAA6-135CAF (for Model BAe 146-100A and -200A series airplanes) or 209RAA6-175ABC (for Model BAe 146-300A series airplanes), in accordance with British Aerospace BAe 146 Inspection Service Bulletin S.B. 27-135, dated April 23, 1992.
(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, 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.
(e) 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.
(f) The inspections and corrective actions shall be done in accordance with British Aerospace BAe 146 Inspection Service Bulletin S.B. 27-135, dated April 23, 1992, which includes Appendices A1 and A2. This incorporation by reference was approved by the Directorof the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from British Aerospace, Inc., Avro Division, 22070 Broderick Drive, Sterling, Virginia 20166. 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.
(g) This amendment becomes effective on October 4, 1993.