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) AD/AT 800/9 and issues the following AD under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Airtractor 800 Series Aeroplanes
AD/AT 800/9 Amdt 1
Engine Mount
9/2007
 
Applicability:
All Model AT-802 and AT-802A aircraft.

Requirement:
1.    Visually inspect the engine mount for cracks in accordance with Snow Engineering Co. Service Letter (SL) No. 253, dated 12 December 2005, revised 22 January 2007.
2.    If crack damage is detected during any inspection, before further flight, incorporate an approved repair scheme, or replace the engine mount with a new engine mount in accordance with the maintenance manual.
Note 1:  Contact Air Tractor Inc. for information on obtaining a repair scheme.
Note 2:  FAA AD 2007-13-17 Amdt 39-15121 refers.

Compliance:
1.    Upon accumulating 1,300 hours time in service or within 100 hours time in service after 30 August 2007, whichever occurs later; unless already accomplished.  Inspect thereafter at intervals not to exceed 300 hours time in service.
2.    If a cracked engine mount is repaired, continue to inspect at intervals not to exceed 300 hours time in service, unless the repair scheme states differently.  If a cracked engine mount is replaced, initially inspect upon accumulating 1,300 hours time in service, and thereafter at intervals not to exceed 300 hours time in service.

 
This Amendment becomes effective on 30 August 2007.

Background:
The FAA received reports of cracked engine mounts.  Such cracking, unless detected and corrected, could result in failure of the engine mount and possible separation of the engine from the aircraft.

 
 
 
 
 
Amendment 1 is issued in response to a new FAA AD which was prompted by reports of two Model AT-802A aircraft with cracked engine mounts below the initial compliance time.  The FAA has determined that the initial inspection is required when the aircraft reaches a total of 1,300 hours time in service.

David Villiers
Delegate of the Civil Aviation Safety Authority
12 July 2007