93-21-06 ISRAEL AIRCRAFT INDUSTRIES, LTD.: Amendment 39-8720. Docket 93-NM-96-AD. Supersedes AD 92-12-07, Amendment 39-8268, which superseded AD 90-10-08, Amendment 39-6597.
Applicability: Model 1125 Westwind Astra series airplanes on which horizontal stabilizer aft spar splice fitting, part number 453005-509, has not been installed, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent reduced structural integrity of the horizontal stabilizer assembly, accomplish the following:
(a) Within the next 50 hours time-in-service after July 31, 1992 (the effective date of AD 92- 12-07, amendment 39-8268), unless previously accomplished within the last 150 hours time-in-service prior to July 31, 1992, perform a visual inspection of the horizontal stabilizer hinge fitting to detect cracks in the outer lug root radius and fore and aft surfaces, and around the hinge pin head and nut of the lugs, in accordance with Astra Service Bulletin 1125-55-017, Revision 1, dated April 24, 1991.
(1) If no cracks are found during this inspection, repeat the inspection at intervals not to exceed 200 hours time-in-service until the inspection required by paragraph (b) is accomplished.
(2) If any crack is found during this inspection, prior to further flight, replace the hinge fitting in accordance with Astra Service Bulletin 1125-55-017, Revision 1, dated April 24, 1991. After replacement, repeat the visual inspection required by this paragraph at intervals not to exceed 200 hours time-in-service until the inspection required by paragraph (b) is accomplished.
(b) Within 25 hours time-in-service after the effective date of this AD, unless previously accomplished within the last 75 hours time-in-service, perform a visual inspection of the horizontal stabilizer hinge fitting, including the horizontal stabilizer aft spar splice fitting, part number 453005-503 (aluminum), to detect cracks in the outer lug root radius and fore and aft surfaces, and around the hinge pin head and nut of the lugs, in accordance with the Accomplishment Instructions of IAI Service Bulletin 1125- 55-017, Revision 1, dated April 24, 1991. Accomplishment of this inspection terminates the requirements of paragraph (a) of this AD.
(1) If no crack is found during this inspection, repeat the inspection at intervals not to exceed 100 hours time-in-service.
(2) If any crack is found during this inspection, prior to further flight, replace the splice fitting, part number 453005-503 (aluminum), with an improved splice fitting, part number 453005- 509 (titanium), in accordance with procedures in the IAI Model 1125 Westwind Astra maintenance manual. Such replacement constitutes terminating action for the inspection requirements of this AD.
(c) Within one year after the effective date of this AD, replace the splice fitting, part number 453005-503 (aluminum), with an improved splice fitting, part number 453005-509 (titanium), in accordance with the IAI Model 1125 Westwind Astra maintenance manual. Such replacement constitutes terminating action for the inspection requirements of this AD.
(d) 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.
(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 inspections and replacements shall be done in accordance with Astra Service Bulletin 1125-55-017, Revision 1, dated April 24, 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 Astra Jet Corporation, Technical Publications, 77 McCullough Drive, Suite 11, New Castle, Delaware 19720. 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 December 13, 1993.