86-21-01 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS): Amendment 39-5431. Applies to all Aerospatiale Model SA 365 series helicopters certificated in all categories.
Compliance is required as indicted, unless already accomplished.
To prevent failure of the main rotor head sleeves, accomplish the following:
(a) For those helicopters exhibiting a severe tracking defect, inspect the main rotor head sleeves as follows before further flight:
(1) Remove main rotor blades and visually inspect the sleeves for cracks, delaminations, or separated bushes; and
(2) Replace any sleeves found damaged with serviceable sleeves.
(b) For Model SA 365C, C1, C2, and C3 helicopters, replace Part Numbers (P/N's) 365A.31.1831.00, .01, .02, .03, and 365A31.1851.00 and .01 main rotor head sleeves as follows:
(1) For sleeves which have 1,900 or more hours' time in service on the effective date of this AD, replace the sleeves within 100 hours' time in service; and(2) For sleeves which have less than 1,900 hours' time in service on the effective date of this AD, replace the sleeves before they reach 2,000 hours' time in service.
(c) For Model SA 365N and N-1 helicopters, replace P/N's 365A31.1829.02 and .03 and 365A31.1828.00 and .01 main rotor head sleeves as follows:
(1) For sleeves which have 900 or more hours' time in service on the effective date of this AD, replace the sleeves within 100 hours' time in service; and
(2) For sleeves which have less than 900 hours' time in service on the effective date of this AD, replace the sleeves before they reach 1,000 hours' time in service.
(d) An alternate method of compliance with this AD, which provides an equivalent level of safety, may be used when approved by the Manager, Aircraft Certification Division, Federal Aviation Administration, P.O. Box 1689, Fort Worth, Texas 76101, or by the Manager, Aircraft Certification Office, AEU-100, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Belgium.
(e) In accordance with FAR Sections 21.197 and 21.199, flight is permitted to a base where the maintenance required by this AD may be accomplished.
NOTE: Aerospatiale Telex Service SA 365C Nos. 01.18 and .01.19 and Aerospatiale Telex Service SA 365N-FS No. 01.18 pertain to this subject.
This amendment becomes effective October 24, 1986.