AD 76-22-10

76-22-10 AVIONS MARCEL DASSAULT (AMD): Amendment 39-2766. Applies to Model Fan Jet Falcon (Falcon 20) airplanes, all series, certificated in all categories, with installed Messier/Hispano Main Landing Gear Actuating Cylinders P/N A23721 (L.H.) and A23722 (R.H.) serial numbers 1 through 807, 809 through 813, 816, 818, and 820 not modified in accordance with AMD Service Bulletin No. 529, dated September 5, 1975.

Compliance is required as indicated.

To prevent possible failure of main landing gear down-locks, accomplish the following:

(a) Inspect the following actuating cylinders for corrosion in accordance with Messier Hispano Technical Instruction DME361-5, or an FAA-approved equivalent:

(1) For S/N 1 through 699, within the next 50 hours time in service or three months, whichever occurs first, after the effective date of this AD, unless already accomplished within the preceding three months, and thereafter at intervals not to exceed six months from the dateof the last inspection.

(2) For S/N 700 through 807, 809 through 813, 816, 818, and 820, within the next 200 hours time in service or four months, whichever occurs first, after the effective date of this AD, unless already accomplished within the preceding two months, and thereafter at intervals not to exceed six months from the date of the last inspection.

(b) If the inspection required by paragraph (a) of this AD reveals the presence of a corrosion condition classified as "very corroded," in accordance with the classification criteria of paragraph 1.c. of AMD Service Bulletin No. 528, dated July 17, 1975 (Revision 2, February 19, 1976), or an FAA-approved equivalent, within the next three months after this inspection -

(1) Replace the actuator with a serviceable part of the same part number and continue the periodic inspections specified in paragraph (a) of this AD; or

(2) Modify the actuator in accordance with AMD Service Bulletin No. 529, dated September 5, 1975, or an FAA-approved equivalent.

(c) The inspections required by paragraphs (a) and (b)(1) of this AD may be discontinued upon the incorporation of the modification specified in paragraph (b)(2) of this AD.

This amendment becomes effective November 22, 1976.