1AD/ECUREUIL/23 Amdt 4 - Main Rotor Mast

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Eurocopter AS 350 (Ecureuil) Series Helicopters

AD/ECUREUIL/23

Amdt 4

Main Rotor Mast 5/88

Applicability: All models with main rotor masts P/N 350A37.1076 .00 to .06

Requirement: 1. (a) Perform the visual check and if necessary, the dye penetrant check called for in Aerospatiale SB 05-13 Rev 3 para’s C(1) and C(2).

(b) Protect any reworked surfaces in accordance with Aerospatiale SB 05-13 Rev 3 para C(3).

2. Aerospatiale SB 05-13 Rev 3.

Note 1: Magnetic particle inspection may be carried out in lieu of dye penetrant and is the preferred technique.

Note 2: Bureau Veritas AD 85-95-40(B) and Bureau Veritas AD 83-173-36(c) refer.

Compliance: 1. Within 10 hours time in service after 30 November 1985, unless already accomplished.

2. As detailed in the requirement document - Aerospatiale SB 05-13 Rev 3 para D.

Background: A fatigue crack initiated from an undetected corrosion pit on an overseas operated helicopter, and propagated to a critical size in 170 hours time in service. This AD has been amended in accordance with the requirement of Bureau Veritas AD 85-94-40(B) which required a one time 10 hour inspection of the main rotor shaft. The requirements of Bureau Veritas AD 85-95-40(B) supplement those of Bureau Veritas AD 83-173-36(c), which were noted in the previous issue of this AD. This Amendment incorporates Revision 3 of the S.B.