Rudder Trim out of the Limits

TASK 27-20-00-810-804-A
Rudder Trim out of the Limits

NOTE: This task is applicable in case of report of:

Constant bank angle in normal cruise range
Rudder trim out of the limits.

1. Possible Causes

adjustment of the rudder mechanical control
adjustment of the rudder neutral position
adjustment of the ailerons
adjustment of the spoilers
flap rigged position
aileron servo controls and hinge bearings
rudder servo controls and hinge bearings
spoilers servo controls and hinge bearings
FAC-1 [1CC1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-66-34-000-002	Removal of the FAC
AMM 22-66-34-400-002	Installation of the FAC
AMM 27-14-00-220-001	Check Aileron Servo Controls and Hinge Bearings for Excessive Play and Condition
AMM 27-14-00-820-001	Adjustment of the Aileron
AMM 27-21-00-820-003	Adjustment of the Rudder Mechanical Control
AMM 27-24-00-200-001	Check of the Rudder Servo Controls and Hinge Bearings for too much Play and Condition
AMM 27-24-00-820-001	Adjustment of the Rudder Neutral Position
AMM 27-51-00-820-003	To do a Check of the Flap Rigged Position (with the Sharks Fin)
AMM 27-51-00-820-007	To do a Check of the Flap Rigged Position (with the Rigging Boards)
AMM 27-64-00-200-001	Check of the Spoilers Servo Controls and Hinge Bearings for Excessive Play and Condition
AMM 27-64-00-820-001	Adjustment of the Spoilers

3. Fault Confirmation
Subtask 27-20-00-710-053-A

A. Test
Not applicable, you cannot confirm this fault on ground.

NOTE: When the aircraft heading is stable with the AP engaged, the rudder trim limits on the RUD TRIM indicator are 1 deg.R and 2.3 deg.L. A rudder trim indication of more than 1 deg.R and 2.3 deg.L is permitted if you have confirmation that the physical position of the rudder is in the limits 1.5 deg.L and 1.5 deg.R.

4. Fault Isolation
Subtask 27-20-00-810-053-A

A. With the QAR or DMU or DAR or DFDR, record the rudder position when the aircraft is in these conditions:

normal cruise range,
straight flight,
AP engaged more than 10 min in the HEADING mode,
symmetrical fuel in the wing tanks,
symmetrical engine thrust.

NOTE: The recorded rudder position (PARAM ALPHA code: RUDD) must be the average value of the rudder position during the above conditions.

(1) If the rudder position value is in the + or - 1.5 deg. range in the L and R directions, no further action is necessary.
(2) If the rudder position value is out of the + or - 1.5 deg. range in the L and R directions, do these checks:
(a) Do a check of the adjustment of the rudder mechanical control AMM 27-21-00-820-003.
(b) Check of the surface adjustment

Do a check of the adjustment of the rudder neutral position AMM 27-24-00-820-001.
Do a check of the adjustment of the ailerons AMM 27-14-00-820-001.
Do a check of the adjustment of the spoilers AMM 27-64-00-820-001.
Do a check of the flap rigged position with the sharks fin AMM 27-51-00-820-003, or with the rigging boards AMM 27-51-00-820-007.

Do a check of the aileron servo controls and hinge bearings for too much play and condition AMM 27-14-00-220-001.
Do a check of the rudder servo controls and hinge bearings for too much play and condition AMM 27-24-00-200-001.
Do a check of the spoilers servo controls and hinge bearings for too much play and condition AMM 27-64-00-200-001.

(d) If the fault continues, replace the FAC-1 [1CC1] AMM 22-66-34-000-002 and AMM 22-66-34-400-002.

[Rev.8 from Aug 2018] 2026.04.04 04:38:56 UTC