AD/HU 369/59 Amdt 1 Main Transmission Oil Lines Cancelled (Cth)

AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/HU 369/59 Amdt 1.

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/59 Amdt 1 Main Transmission Oil Lines 6/2009

Requirement:

CANCELLED.

This AD is cancelled on 4 June 2009.

Background:

This unique Australian AD raised in 1987 required an inspection against Hughes Service Information Notice (SIN) No. EN-10 and DN-124 and a modification against Hughes Service Information Notice (SIN) No. DN-145, EN-33 and FN-22.  The manufacturer introduced a periodic inspection for chafing damage of the main transmission oil lines that could cause loss of oil to the transmission.  The modification replaced rigid lines with flexible lines.

Compliance was:

1.    Inspect within100 hours TIS after 30 June 1987 and thereafter at intervals not exceeding 100 hours TIS until modified.

2.    Whenever damaged rigid lines need to be replaced or at the next main transmission overhaul after 30 June 1987 whichever occurs first.

This AD has been sufficiently promulgated for the affected aircraft to have been modified by now; therefore this AD is considered to be no longer required.

James Coyne
Delegate of the Civil Aviation Safety Authority

24 April 2009