Commonwealth legislation

AD/ECUREUIL/23 Amdt 4 - Main Rotor Mast

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Commonwealth

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legislative instrument

Plain English Summary

4/10 complexity

Mandates a one‑time inspection and any necessary repair/protection of the main rotor mast (P/N 350A37.1076.00–.06) on Eurocopter AS350 helicopters by following Aerospatiale Service Bulletin 05‑13 Rev 3: visual and dye‑penetrant (or magnetic particle) checks and protection of reworked surfaces. Work must be done within 10 hours time‑in‑service after 30 Nov 1985 unless already accomplished. The AD responds to a fatigue crack traced to a corrosion pit; operators pay for inspections and repairs under the referenced service bulletin.

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AD/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).

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.

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.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

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