92-19-01 AEROSPATIALE: Amendment 39-8358. Docket No. 92-NM-126-AD. Supersedes AD 89-09-05 R1, Amendment 39-6393.
Applicability: All Model ATR42 series airplanes, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To minimize the potential hazards associated with operating in icing conditions including freezing rain, accomplish the following:
(a) Within 10 hours time-in-service after May 3, 1989 (the effective date of AD 89-09-05, Amendment 39-6197), incorporate the following statement into the Limitations Section of the FAA-approved Airplane Flight Manual (AFM). This may be accomplished by including a copy of this AD in the AFM. "When operating in icing conditions, as defined in the AFM, or when freezing rain is forecast or reported, use of the autopilot is prohibited.
WARNING:
Prolonged operation in freezing rain should be avoided. Ice accretion due to freezing rain may result in asymmetric wing lift andassociated increased aileron forces necessary to maintain coordinated flight. Whenever the aircraft exhibits buffet onset, uncommanded roll, or unusual control wheel forces, immediately reduce angle-of-attack and avoid excessive maneuvering."
(b) Within 60 days after December 15, 1989 (the effective date of AD 89-09-05 R1, Amendment 39-6393), install vortex generators, in accordance with Aerospatiale Service Bulletin ATR42-57-0018, Revision 1, dated June 28, 1989. This action constitutes terminating action for the AFM limitation required by paragraph (a) of this AD, regarding use of the autopilot when operating in icing conditions, and the limitation may be removed from the AFM.
(c) Operations may continue with a configuration consisting of one vortex generator missing per wing, provided that the two missing vortex generators form a symmetrical pair in relation to the airplane centerline.
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.
NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch.
(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 installation shall be done in accordance with Aerospatiale Service Bulletin ATR42-57-0018, Revision 1, dated June 28, 1989, which contains the following list of effective pages:
Page Number
Revision Level
Date
1, 3, 5-13
1
June 28, 1989
2, 4
Original
May 3, 1989
This incorporation by reference wasapproved 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 Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. 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 September 18, 1992.