(2)
Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).
(3)
Make sure that the work area is clean and clear of tool(s) and other items.
(4)
Remove the access platform(s).
(5)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
THS MECHANICAL CONTROL - DESCRIPTION AND OPERATION
__________________________________________________
1. General
_______
R An actuator operates the trimmable horizontal stabilizer. The mechanical control includes two rotating control wheels installed on the center pedestal. They drive a chain and cable loop up to the mechanical input of the actuator.
2. Component Location
__________________ R (Ref. Fig. 001, 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------25LM INDICATOR-L PITCH TRIM, CENTER 211 27-41-41 PEDESTAL 26LM INDICATOR-R PITCH TRIM, CENTER 212 27-41-41
PEDESTAL CONTROL MECHANISM-PITCH TRIM 210 27-41-41 REGULATOR-CABLE TENSION 311 312AR 27-41-42 STOP AND GEARSET UNIT-PITCH 121 811 27-41-43
TRIM CONTROL CABLES-THS CONTROL 27-41-44
3. Component Description
_____________________
A. Cable Tension Compensator (Ref. Fig. 003) One cable tension compensator maintains a constant tension on the cables.
B. Stop and Rigging Facilities A non-adjustable rotation stop installed in the center pedestal limits the travel of the control wheel. Another mechanical rotation stop is installed in the THS actuator, at the input shaft. The end-of-stroke stops of the actuator ball screwjack provide the structural stops of the THS. Rigging pin holes are provided to facilitate the rigging.
4. Leading Particulars
___________________
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
-pitch trim control wheel
radius: 116 mm (4.5669 in.)
travel:
1.87 revolutions A/C nose down (including 0.01 revolution of overstroke)
6.32 revolutions A/C nose up (including 0.01 revolution of overstroke).
-THS maximum authority: 4 deg A/C nose down, 13.5 deg A/C nose up
-stops:
-------------------------------------------------------------------------------| | THS Deflection | | |-------------------------------------| | | A/C Nose down | A/C Nose up | |---------------------------------------|-------------------|-----------------| | Max. operational deflection | 4 deg + 5' | 13.5 deg + 5' | | (THS input-shaft stops) | - 15' | - 15' | |---------------------------------------|-------------------|-----------------| | Computer Limitation | 3.5 deg + 5' | 11 deg + 25' | | | -5' | - 30' | |---------------------------------------|-------------------|-----------------| | THS actuator input shaft stops | 4 deg + 5' | 13.5 deg + 5' | | (without computer limitation) | - 15' | - 15' | |---------------------------------------|-------------------|-----------------| | Stops of actuator ball screwjack | 4.3 deg | 13.83 deg | -------------------------------------------------------------------------------
-rate of travel: Unit capability: 1 deg/s of THS actuator deflection in single-system operation (2 deg/s of THS actuator delection in two-system operation) Electrical control rate limitation:
0.3 deg/s when flap position < 0.5 deg
0.7 deg/s when flap position > 0.5 deg
-control wheel torque:
Electric motors jammed: 0.51 m.daN (45.1327 lbf.in)
With runaway of electric motors: 0.39 m.daN (34.5132 lbf.in).
R **ON A/C 151-199, 401-499,
-pitch trim control wheel
radius: 116 mm (4.5669 in.)
travel:
1.87 revolutions A/C nose down (including 0.01 revolution of overstroke)
6.32 revolutions A/C nose up (including 0.01 revolution of overstroke).
THS Mechanical Control R Figure 001
1EFF : ALL 1 27-41-00Page 3/4 1 1 Aug 01/05 1 1 1CES
R R THS Mechanical Control - Location Figure 002
1EFF : 1 1 1CES ALL 1 111 27-41-00 Page 5 Aug 01/05
Cable Tension Compensator Figure 003
1EFF : 1 1R 1CES ALL 1 11 1 27-41-00 Page 6 Aug 01/05
-THS maximum authority: 4 deg A/C nose down, 13.5 deg A/C nose up
-stops:
-------------------------------------------------------------------------------| | THS Deflection | | |-------------------------------------| | | A/C Nose down | A/C Nose up | |---------------------------------------|-------------------|-----------------| | Trim wheel stop | 4.02 deg + 6' | 13.52 deg + 6' | | | - 18' | - 18' | |---------------------------------------|-------------------|-----------------| | Computer Limitation | 4 deg + 15' | 11 deg + 30' | | | - 15' | - 30' | |---------------------------------------|-------------------|-----------------| | THS actuator input shaft stops | 4 deg + 6' | 13.5 deg + 6' | | (without computer limitation) | - 18' | - 18' | |---------------------------------------|-------------------|-----------------| | Stops of actuator ball screwjack | 4.3 deg | 13.81 deg | -------------------------------------------------------------------------------
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