I’ve got these figures of THS rate.
The THS itself (the ballscrew) is driven by 2 hydraulic (B & Y) motors.
Max. Operating Load and Max. Speed (2 motors)
18940 daN (42578.81 lbf) ----- 0.4°/s
16950 daN (38105.11 lbf) ----- 1.0°/s
6770 daN (15219.56 lbf) ---- 1.2°/s
Limit load (both compression as tension) is 32500 daN (73062.9 lbf).
I assume this limit load is mentioned as being the limit for the Hydr.
motors to drive the THS.
Half speed for 1 motor (1 hydr. B or Y system failure) operation.
The rate for the BEA mentioned 1 minute to go from 3 to 13 ANU was 10°/60 = 0.16°/s.
For going back to the 3° ANU position:
The hinges are on the trailing edge and therefore the aerodynamic
load on the drive spindle is in the AND direction it would take 12 sec. to travel from 13° back to 3° ANU.
The manual trim wheel THS displacement is ~0,65° a stroke, if one need
1s to complete the stroke and 1s to re-grab the wheel, the rate will be 0,325°/s.
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For the PFD messages "MAN PITCH TRIM ONLY":
ELEVATORS NORMAL OPERATION
Each elevator servocontrol is connected to two computers (one FCPC
and one FCSC).
In the normal configuration, the inboard servocontrol is in active mode
while the outboard is in damping mode.
FCPC 1 having the servo-loop control priority:
- sets its dedicated servocontrol in active mode and ensures the servoloop
control,
- commands the damping mode on the adjacent servocontrol (one solenoid
valve (S) energized).
For the elevator servolooping computation the computers need to acquire:
- the elevator surface position,
- the elevator servocontrol piston position.
This information is sent by servocontrol transducers (XDCRs) units and
the surface position transducer (RVDT).
In the event of large deflection demands, the two servo-controls can
become active to avoid the saturation of one servocontrol.
ELEVATORS ABNORMAL OPERATIONS
HYDRAULIC OR ELECTRICAL FAILURE
If a servocontrol being in active mode is either not hydraulically powered
or not electrically controlled anymore,
the faulty servocontrol falls in damping mode and the adjacent one
becomes active according the servoloop reconfiguration.
If both servocontrols of one elevator are depressurized (e.g. Hydraulic failure)
both servocontrols are in damping mode which prevents fluttering.
When P1, P2, S1 and S2 are no longer able to control their dedicated
servocontrol (ie: inputs missing, electrical failure, etc...), the servocontrols
fall in
re-centering mode.
The elevator becomes a 'fixed' part of the THS. (=
MAN PITCH TRIM ONLY)
When
autotrim in not available (e.g. Direct Law, Flare Law in case RA is
unavailable or NAV
IR DISAGREE the PFD message "
USE MAN PITCH TRIM" is shown.