COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Supplementary Equipment
AD/SUPP/8 Towing Release System 1/86
Applicability: All towing release systems used in aircraft not covered by a system of maintenance approved pursuant to Air Navigation Regulation 43 - (3).
Requirement: 1. (a) Ensure that the cockpit control has full and free movement.
(b) Check that the release mechanism is clean.
(c) Check for visible signs of damage or wear of the release mechanism.
(d) Perform a functional check.
2. (a) Clean and lubricate the hook mechanism.
(b) Check the beak and other parts for wear.
(c) Check the condition of operating levers, cables and pulleys.
(d) Test the ability of the system to return to a safe over-centre position of the mechanism. The return force as measured at the activating lever of the hook shall not be less than 20N (Newton) (2 Kg force).
3. Remove the release assembly and overhaul in accordance with the manufacturer's data and instructions.
Test that the pilot effort is less than 200N (20 Kg force) with a 4.5kN (450 Kg force) load applied to the release anywhere in a 30 degree cone.
Compliance: For para 1. Daily whilst engaged in towing operations.
Note: This AD is to be recorded in Part 1 of the Maintenance Release.
The inspection may be accomplished by the pilot in command, in which case he shall enter and certify for this AD in Col 2 Part 3 of the Maintenance Release on each occasion.
For para 2. Prior to issue of the next Maintenance Release after 28 February 1986 and thereafter at each issue of a Maintenance Release.
For para 3. Prior to issue of the next Maintenance Release after 30 June 1986 and thereafter at intervals not exceeding 1000 hours time in service or 1 year, whichever occurs first.
Note: Towing release mechanisms may be overhauled by a GFA approved Inspector in accordance with the requirements contained in the relevant Airworthiness Directives issued by the GFA. The overhaul status of the towing release assembly must be adequately documented.
Background: The requirement for towing release system maintenance has not been adequately addressed in the past.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES