AD 92-26-01

92-26-01 CASA: Amendment 39-8428. Docket No. 92-NM-141-AD. Applicability: All Model CN-235, CN-235-100, and CN-235-200 series airplanes, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent flap separation and loss of roll control due to unsymmetrical wing surfaces, accomplish the following:

(a) Perform detailed visual inspections of the flap track support structure to detect cracks and corrosion in accordance with CASA Maintenance Instructions 235-58, dated November 21, 1991, at the intervals specified in paragraph (a)(1) or (a)(2) of this AD, as applicable.

(1) For airplanes that have accumulated 2,000 hours time-in-service or less as of the effective date of this AD: Within 12 months after the effective date of this AD, or at the next "C" check, whichever occurs first, and thereafter at intervals not to exceed 12 months.

(2) For airplanes that have accumulated more than 2,000 hours time-in-service as of the effective date of this AD: Within 100 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 12 months.

(b) If cracks or corrosion are found as a result of the inspections required by paragraph (a) of this AD, prior to further flight, replace cracked or corroded parts in accordance with a method approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

(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, 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.

(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 inspections shall be done in accordance with CASA Maintenance Instructions 235-58, dated November 21, 1991. 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 Construcciones Aeronauticas S.A., Getafe, Madrid, Spain. 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 January 12, 1993.