AD 87-21-09

87-21-09 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: Amendment 39- 5747. Applies to all Model AS 332C and L helicopters certificated in all categories.

Compliance is required as indicated, unless already accomplished.

To prevent loss of the AC electrical generation system, accomplish the following:

(a) Within the next 50 hours' time in service or the next 30 days after the effective date of this AD, inspect the electrical cable bundles connecting each AC generator to its regulating card in accordance with the instructions given in paragraph BBA of Aerospatiale Telex Service No. 05.12, transmitted by Aerospatiale Telex No. 10084, dated January 16, 1987.

(b) The aircraft can be returned to operational service if the insulation values measured are greater than 2 megohms.

(c) If the insulation values measured are less than 2 megohms, the installation is to be modified in accordance with the instructions given in Aerospatiale AS 332 Service Bulletin No. 24.10,paragraph 2, "Accomplishment Instructions."

(d) Within 400 hours' time in service following the inspection or before December 31, 1987, whichever occurs first, modify the aircraft in accordance with the instructions given in AS 332 Service Bulletin No. 24.10, paragraph 2, "Accomplishment Instructions."

(e) An alternate means of compliance which provides an equivalent level of safety may be used if approved by the Manager, Aircraft Certification Division, Federal Aviation Administration, Fort Worth, Texas 76193-0100.

This amendment becomes effective November 12, 1987.