AD/CL-600/29 - Horizontal Stabiliser Trim Actuator (Cth)

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

Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes

AD/CL-600/29 Horizontal Stabiliser Trim Actuator 6/95

DM

Applicability: All Canadair CL-600 aircraft as follows:

Model Serial Numbers

CL-600-1A11 1004 to 1085

CL-600-2A12 3001 to 3066 CL-600-2B16 5001 to 5299 excluding 5138 Requirement: 1. Perform the following operational check of the Horizontal Stabilizer Trim Actuator (HSTA) brake:

1. Press the CHAN 1 INOP/CHAN 2 INOP switch/light and then the OVSP/CHNG CHAN switch/light on the centre pedestal control panel.

b. Set and hold the pitch trim switch on the pilot's control wheel until the stabilizer is in full NOSE UP position.

c. Set and hold the pitch trim switch on the pilot's control wheel to NOSE DOWN position and while the stabilizer is moving, press the PITCH TRIM DISC switch on the pilot's control wheel when the needle on the stabilizer trim position indicator reaches the first marking of the take-off configuration green band. Verify that both CHAN INOP lights are on.

d. Verify that the stabilizer over-travel is less than one degree, as read on the stabilizer trim position on the centre instrument panel.

Note: One increment on the stabilizer trim position indicator is equal to one degree of stabilizer travel.

If the stabilizer over-travel is less than or equal to one degree, the pitch trim brake performance meets the ground performance requirements and is serviceable.

If the stabilizer over-travel is more than one degree, refer to Requirement 2.

2. Action in accordance with the Accomplishment Instructions Part A of Bombardier Inc, Canadair Business Aircraft Division Alert Service Bulletin A600-0645 or A601-0443, both dated 11 January 1995, as applicable.