AD 91-26-01

91-26-01 BRITISH AEROSPACE: Amendment 39-8112. Docket No. 91-NM-117-AD. Applicability: All Viscount Model 744, 745D, and 810 series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent reduced controllability of the airplane, accomplish the following:

(a) Within 180 days after the effective date of this AD, and thereafter at intervals not to exceed 4 years, perform a visual inspection of the elevators to detect corrosion of the mild steel balance weights and of the forward face of the leading edge members in accordance with British Aerospace Preliminary Technical Leaflet (PTL) No. 324 (for Viscount Model 744 and 745D series airplanes), Issue 1, or PTL No. 193 (for Viscount Model 810 series airplanes), Issue 1, both dated February 10, 1990, as applicable.

(1) If corrosion is found in the mild steel balance weights, prior to further flight, repair in accordance with the applicable PTL.(2) If corrosion is found in the forward face of the leading edge members, prior to further flight, repair in accordance with the applicable PTL. If corrosion exceeds the limits specified in the PTL, prior to further flight, replace the members in accordance with the PTL.

(b) 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.

(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

(d) The inspection and repair requirements shall be done in accordance with British Aerospace Preliminary Technical Leaflet (PTL) No. 324 (for Viscount Model 744 and 745D series airplanes) Issue 1, dated February 10, 1990; or PTL No. 193 (for Viscount Model 810 series airplanes), Issue 1, dated February 10, 1990; 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, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

(e) This amendment (39-8112, AD 91-26-01) becomes effective on March 23, 1992.