AD 80-15-13

80-15-13 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 3856. Applies to Model AS 350 series helicopters, certificated in all categories, which have main rotor assembly, P/N 350A.37.0003, serial numbers M1 through M146 installed.

Compliance required as indicated.

To rectify incorrect installation of the rotating star drive adapter which could result in vibration and premature wear of the rotating star bolts, accomplish the following:

(a) Within the next 25 hours time in service after the effective date of this AD, unless already accomplished:

(1) Measure the dimension between the spacer and the upper face of the rotating drive adapter, P/N 350A.36.1119, at locations no more than 120 degrees apart using a fixed length block and a feeler gage.

(2) Compare the measurements.

(b) If the measurement comparison required in paragraph (a)(2) of this AD reveals a variation of 0.039 inches (1 mm) or less, return to service and comply with paragraph(d) of this AD.

(c) If the comparison required in paragraph (a)(2) of this AD reveals a variation in excess of 0.039 inches (1 mm), reposition the rotating star drive adapter perpendicular to the drive shaft in accordance with sub-paragraph 2. of paragraph C, "DESCRIPTION," of Aerospatiale (SNIAS) Service Bulletin No. 65.01, dated October 20, 1978, or an FAA-approved equivalent.

NOTE: The AS 350 Maintenance Manual Work Card No. 65.13.603 pertains to this same subject.

(d) Following any maintenance action on the rotating star drive adapter bolt, comply with paragraph (a)(1), (a)(2), and paragraph (b) or (c) of this AD.

(e) For a rotor assembly with a serial number M1 through M146, held as spare, comply with this AD at installation and release to service.

(f) For purposes of this AD, an FAA-approved equivalent may be approved by the Chief, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, Brussels, Belgium.This amendment becomes effective August 7, 1980.