COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Airtractor AT-300, 400 and 500 Series Aeroplanes
AD/AT/18 Parking Brake Valve 5/97
All model AT-250, AT-300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402,
AT-501 and AT-502 series aircraft not fitted with Scott P/N 4500A-2 parking brake valve.
Unless previously carried out, replace Gerdes P/N A-850-5 or Cleveland P/N 60-9, as applicable, parking brake valve with Scott P/N 4500A-2 parking brake valve in accordance with Snow Engineering Co. Service Letter #76, dated December 12, 1988.
FAA AD 96-24-08 Amdt 39-9833 refers.
At next scheduled maintenance release issue after 31 May 1997, or by 31 December 1997, whichever occurs first.
This Airworthiness Directive becomes effective on 24 April 1997.
Advice has been received that during flight the parking brake valve lever can slip from the OFF to the ON position and has caused several aircraft to overturn when landing.