AD 75-22-07

75-22-07 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 2401. Applies to SA341G helicopters, certificated in all categories, equipped with main gear boxes P/N 341A.32.1000.01, .02, .03, or .05 with less than 25 hours time in service since new or overhauled, and that have not been altered in accordance with AMS 07.7077.

Compliance is required until the accumulation of 25 hours time in service on new and newly overhauled main gear box.

To detect main gear box (MGB) defects, accomplish the following:

(a) Before each flight after the effective date of this AD check the MGB magnetic plug for particles and check the main gear box for abnormal friction points or noise by slowly rotating the main rotor by hand.

(b) Before the first flight of each day after the effective date of this AD or within intervals of 5 hours MGB time in service after the last inspection, whichever occurs first, check the MGB oil filter for foreign metallic particles.

(c) If highly heated and laminated (black) particles appear on the magnetic plug, or if fine particles deposited on the magnetic plug are preceded or accompanied by bronze particles left in the main gear box oil filter, or if abnormal friction points or noise is detected on the main gear box, prior to further flight replace main gear box with a serviceable part of the same part number incorporating Modification AMS 07.7077, or an FAA-approved equivalent. The checks required by this AD may be performed by the pilot.

(Aerospatiale's Service Bulletin No. 05.10 dated February 7, 1975, refers to this subject).

This amendment becomes effective November 3, 1975.