Airworthiness Directive · Amendment 39-16153 · Wings
Construcciones Aeronauticas, S.A. (CASA), Model CN-235, CN-235-100, CN-235-200, and CN-235-300 Airplanes
This AD applies to CASA Model CN-235, CN-235-100, CN-235-200, and CN-235-300 airplanes, certificated in any category, all serial numbers, if part number (P/N) 35-15501-0001, -0002, -0003, or -0004, or P/N 35-A0736-0001 or -0002 outer flaps are installed.
We are superseding an existing airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) For airplanes equipped with P/N 35-A0736-0001 or -0002 outer flaps: Within 300 flight cycles after the effective date of this AD, do a borescopic inspection to detect cracking of the outer flaps fittings and longerons, in accordance with the Accomplishment Instructions of EADS-CASA Service Bulletin SB-235-57-20, Revision 2, dated March 30, 2007.
(2) For airplanes equipped with P/N 35-15501-0001, -0002, -0003, or -0004 outer flaps: At the earlier of the times specified in paragraphs (f)(2)(i) and (f)(2)(ii) of this AD, do a borescopic inspection to detect cracking of the outer flaps fittings; and within 300 flight cycles after the effective date of this AD, do a borescopic inspection to detect cracking of the longerons. Do the inspections in accordance with the Accomplishment Instructions of EADS-CASA Service Bulletin SB-235-57-20, Revision 2, dated March 30, 2007.
(i) Within 600 flight cycles after the most recent inspection done in accordance with AD 99-07-13, or within 14 days after the effective date of this AD, whichever occurs later.
(ii) Within 300 flight cycles after the effective date of this AD.
(3) If, during any inspection required by paragraph (f)(1) or (f)(2) of this AD, no crack is detected, repeat the borescopic inspections of the outer flap fittings and longerons in accordance with the Accomplishment Instructions of EADS-CASA Service Bulletin SB-235-57-20, Revision 2, dated March 30, 2007, thereafter at intervals not to exceed 300 flight cycles or 6 months, whichever occurs first, until the replacement specified in paragraph (f)(4) or (f)(5) of this AD is accomplished.
(4) If any crack is detected during any inspection required by paragraph (f)(1), (f)(2), or (f)(3) of this AD, prior to further flight, replace the outer flap with a new or retrofitted flap in accordance with the Accomplishment Instructions of EADS-CASA Service Bulletin SB-235-57-20, Revision 2, dated March 30, 2007. Such replacement constitutes terminating action for the repetitive borescopic inspection required by this AD for the replaced outer flap only.
(5) For affected parts that have not been replaced in accordance with paragraph (f)(4) of this AD: At the later of the times specified in paragraphs (f)(5)(i) and (f)(5)(ii) of this AD, replace each outer flap with a new or retrofitted outer flap in accordance with the Accomplishment Instructions of EADS-CASA Service Bulletin SB-235-57-20, Revision 2, dated March 30, 2007. Replacing all outer flaps terminates the requirements of this AD.
(i) Before the accumulation of 4,000 total flight cycles on the flap.
(ii) Within 1,200 flight cycles or 24 months after the effective date of this AD, whichever occurs first.
(6) Actions done before the effective date of this AD in accordance with CASA Service Bulletin SB-235-57-20, dated December 23, 1997; or EADS-CASA Service Bulletin SB-235-57-20, Revision 1, dated April 30, 2004; are acceptable for compliance with the corresponding requirements of paragraph (f)(2) of this AD.
Note 1: This AD differs from the MCAI and/or service information as follows: No differences.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
