AD 97-10-07

97-10-07 CONSTRUCCIONES AERONAUTICAS, S.A., CASA: Amendment 39-10019. Docket 96-NM-144-AD. Applicability: All Model CN-235, CN-235-100, and CN-235-200 series airplanes; certificated in any category.

NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance: Required as indicated, unless accomplished previously.

To prevent in-flight uncommanded activation of the propeller brake system, which could result in in-flight shutdown of the engine, accomplish the following:

(a) Within 10 days after the effective date of this AD, disable the brake control valve of the propeller in accordance with Annex 1 of CASA Communication COM 235-82, Revision 3, dated January 31, 1995.

(b) Prior to restoring propeller brake operation, replace the propeller brake control unit having part number (P/N) HP1410100-5 or HP1410100-7, with a new propeller brake control unit having P/N HP1410100-9, in accordance with CASA Service Bulletin SB-235-61-01, dated October 11, 1994; or CASA Service Bulletin SB-235-61-01M, Revision 2 (for military airplanes), dated January 25, 1996; as applicable. Accomplishment of this replacement constitutes terminating action for the requirements of paragraph (a) of this AD.

(c) An alternative method of compliance or adjustment of the compliancetime 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 2: 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 sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished.

(e) Disabling the brake control valve of the propeller shall be done in accordance with Annex 1 of CASA Communication COM 235-82, Revision 3, dated January 31, 1995. The replacement shall be done in accordance with CASA Service Bulletin SB-235-61-01, dated October 11, 1994; or CASA Service Bulletin SB-235-61-01M, Revision 2, dated January 25, 1996; as applicable. CASA Service Bulletin SB-235-61-01M, Revision 2, dated January 25, 1996, contains the following list of effective pages:

Page Number Revision Level Shown on Page Date Shown on Page 1 1 November 27, 1995 2 2 January 25, 1996 3-11 Original October 11, 1994

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 June 16, 1997.