(2)
Open the access door 312AR.
R THS Actuator Backlash Check Figure 606/TASK 27-44-51-991-013
1EFF : 1 1 1CES ALL 1 111 27-44-51 Page 632 Feb 01/05
Subtask 27-44-51-860-052
B. Aircraft Maintenance Configuration
(1)
Make sure that the actuator for the Trimmable Horizontal Stabilizer is in the 0 degree position.
(2)
Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).
(3)
Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).
(4)
Put warning notices on the ground service panels of the Green and Yellow hydraulic systems to tell persons not to pressurize the Green and Yellow hydraulic systems.
(5)
Put warning notices in the cockpit to tell persons not to operate the pitch controls.
Subtask 27-44-51-865-055
R C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU FLIGHT CONTROLS/ELAC1/NORM/SPLY 15CE1 B11 49VU FLIGHT CONTROLS/THS/ACTR/MOT2 19CE2 B09 105VU FLT CTL/ELAC1/STBY SPLY 16CE1 A01 121VU FLIGHT CONTROLS/THS ACTR/MOT3 19CE3 Q17 121VU FLIGHT CONTROLS/THS ACTR/MOT1 19CE1 Q16
Subtask 27-44-51-480-051
D. Install the BACKLASH CHECKING TOOL - THS ACTUATOR (0U190863):
(1)
Clean the screwshaft with a lint-free cloth MISCELLANEOUS (Material No. 19-003) and CLEANING AGENTS (Material No. 11-002) and let it dry.
(2)
Install the mechanical stop unit, part of the BACKLASH CHECKING TOOL-THS ACTUATOR, on the top side of the ballnut with the screws (1).
(3)
Make sure, that the cams of the mechanical stop unit engage with the cams of the ballnut.
(4)
Make sure, that the mechanical stop unit does not touch the thread of the screw shaft.
R (5) Install the clamp and the lever assembly, parts of the BACKLASH R CHECKING TOOL - THS ACTUATOR, on the top side of the mechanical stop R unit to the thread of the screw shaft.
R (6) Install the dial indicator part of the BACKLASH CHECKING TOOL - THS ACTUATOR on the screwshaft below the ballnut.
R (7) Set the dial indicator to zero.
4. Procedure
_________
(Ref. Fig. 606/TASK 27-44-51-991-013)
Subtask 27-44-51-220-052
A. Check of the Backlash
R (1) Apply a force of 12 daN (27.0 lbf.) vertically (parallel to the screw
R shaft of the THS actuator) at the application hole of the lever assy of the BACKLASH CHECKING TOOL - THS ACTUATOR. Make sure that the application hole is 385 mm (15.1574 in.) away from the edge of the fitting fork.
(2) Use the dial indicator and make sure that the backlash is not more than 0.15 mm (0.0059 in.).
5. Close-up
________
Subtask 27-44-51-080-051
A. Remove the BACKLASH CHECKING TOOL - THS ACTUATOR.
Subtask 27-44-51-640-050
B. Apply a small quantity of COMMON GREASE (Material No. 04-004) to the screwshaft and lubricate the ball screw nut as necessary (Ref. TASK 12-22-27-640-003).
Subtask 27-44-51-410-061
C. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the access door 312AR.
Subtask 27-44-51-865-056
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 15CE1, 16CE1, 19CE1, 19CE2, 19CE3.
1EFF : ALL 1 27-44-51Page 634 1 1 May 01/02 1 1 1CES 1 TASK 27-44-51-200-002
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