AD 93-07-03

93-07-03 AEROSPATIALE: Amendment 39-8535. Docket 92-NM-163-AD.

Applicability: All Model ATR42-300 series airplanes, and all Model ATR72-100 and - 200 series airplanes; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent failure of the pressurization valves to close in the event of ditching, and to prevent interruption of electrical power to certain electrical equipment used during approach and landing, accomplish the following:

(a) Within 30 days after the effective date of this AD, remove the electrical switches, part numbers 9PD and 12HM, and identify the date codes in accordance with Aerospatiale Service Bulletin ATR42-31-0023, dated May 15, 1992 (for Model ATR42-300 and -320 series airplanes); or Aerospatiale Service Bulletin ATR72-31-1006, dated May 15, 1992 (for Model ATR72-100 and -200 series airplanes); as applicable.

(1) If the date code is identified as A6, A7, A8, A9, AO, AN, AD, B1, B2, B3, B4, B5, B6, or B7, prior to further flight, replace the currently-installed switch with a serviceable switch marked with a date code other than those listed above.

(2) If the date code is other than those listed in paragraph (a)(1) of this AD, reinstall the switch. No further action is necessary.

(b) As of the effective date of this AD, no person shall install an electrical switch, part numbers 9PD and 12HM, having a date code of A6, A7, A8, A9, AO, AN, AD, B1, B2, B3, B4, B5, B6, or B7, on any airplane.

(c) 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. 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.

(d) 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.

(e) The removal and identification shall be done in accordance with Aerospatiale Service Bulletin ATR42-31-0023, dated May 15, 1992 (for Model ATR42-300 and -320 series airplanes); or Aerospatiale Service Bulletin ATR72-31-1006, dated May 15, 1992 (for Model ATR72-100 and -200 series airplanes); 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 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.

(f) This amendment becomes effective on May 10, 1993.