I'd say alternate law/load factor demand work the same as in normal flight - i.e. the airplane is stable and flt controls behavior is unchanged - no trim required to fly the plane. The only difference would be that the elevator stays permanently deflected to maintain commanded path. A manual input on the trim wheel is only required to zero the elevator deflection.
Here's an excerpt from the FCOM:
F/CTL STAB CTL FAULT Applicable to: MSN ***
Ident.: PRO-ABN-27-L-00010373.0001001 / 05 AUG 10
MAN PITCH TRIM........................................................ ...........................................................C HECK L2The force needed on the pitch trim wheel may be higher than usual (pre-takeoff manual setting). L1 IF MAN TRIM AVAIL: TRIM FOR NEUTRAL ELEV L2 If man pitch trim is available, trim to maintain elevator at zero position (indications on F/CTL SD page). To improve the longitudinal control of the aircraft, it is recommended to disconnect the autothrust.
L1 IF TRIM LOCKED > 8 UP: MAX SPEED....................................................... ............................................................ ...180 KT L2 If trim is locked above 8 ° up, pitch down authority may not be sufficient for speed above 180 kt. Select configuration as appropriate - Fuel consumption is increased.
L1
ASSOCIATED PROCEDURES
F/CTL ALTN LAW (PROT LOST) MAX SPEED....................................................... ............................................................ ..........330/.82
Last edited by C_Star; 3rd June 2016 at 10:32.