1AD/HU 269/99 Amdt 1 - Main Rotor Drive Shaft Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Schweizer (Hughes) 269 Series Helicopters

AD/HU 269/99

Amdt 1

Main Rotor Drive Shaft Inspection 6/93 DM

Applicability: All model 269A, A-1, B, C and TH-55A helicopters fitted with main rotor drive shaft P/N 269A5305-3 or 269A5305-11.

Requirement: Unless previously carried out, action in accordance with the Technical requirements of Schweizer Mandatory Service Bulletin B-255.1 dated 01 Feb 1993 except that, X- Ray inspection may be conducted by an approved Australian NDI organisation. Refer Note 2 of Compliance for suitable organisation.

Note: FAA Priority Letter AD 92-25-14 refers to Schweizer SB B-255.

Compliance: As specified in the Requirement Document with a revised effective date of 14 April 1993.

Note 1: Drive shafts previously inspected in accordance with SB B-255 must be re- inspected in accordance with SB B-255.1 mandated by this directive.

Note 2: Operators wishing to discuss the availability of alternative NDI arrangements should contact Mr Chris Wolff of Motor Holdings, the Australian Schweizer agent, at Archerfield Airport on phone 07 277 6955.

Background: The FAA AD was prompted by the report of a main rotor drive shaft failure resulting in loss of the helicopter and two fatalities. This amendment has been raised to mandate the manufacturer’s NDI procedures on the main rotor drive shaft.