DOC AIRBUS | AMM A320FTHS MECHANICAL CONTROL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
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.
** ON A/C NOT FOR ALL 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
** ON A/C NOT FOR ALL 
THS Mechanical Control| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 25LM | INDICATOR-L PITCH TRIM, CENTER PEDESTAL | 210 | 11-20-00 | ||
| 26LM | INDICATOR-R PITCH TRIM, CENTER PEDESTAL | 210 | 11-20-00 | ||
3. Component Description
A. Cable Tension Compensator
One cable tension compensator maintains a constant tension on the cables.
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.
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
- 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 (45.13 lbf.in)
With runaway of electric motors: 0.39 m.daN (34.51 lbf.in).
- 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 ! !---------------------------------------!-------------------!-----------------! ! 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 ! ------------------------------------------------------------------------------- - 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 (45.13 lbf.in)
With runaway of electric motors: 0.39 m.daN (34.51 lbf.in).