Failure of the Left or Right Pedals Position Transducer Unit

TASK 27-10-00-810-847-A
Failure of the Left or Right Pedals Position Transducer Unit

1. Possible Causes

hard spot on the rudder pedals control linkages
XDCR UNIT-PEDAL POS, L [25CE1]
XDCR UNIT-PEDAL POS, R [25CE2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-20-00-810-801-A	CAPT and F/O Pedals Stiffness
AMM 27-21-42-000-001	Removal of the CAPT Pedals
AMM 27-21-42-000-002	Removal of the F/O Pedals
AMM 27-21-42-400-001	Installation of the CAPT Pedals
AMM 27-21-42-400-002	Installation of the F/O Pedals
AMM 27-24-00-710-001	Operational Test of the Rudder Hydraulic Actuation
AMM 27-92-15-000-001	Removal of the Pedal Position Transducer Unit
AMM 27-92-15-400-001	Installation of the Pedal Position Transducer Unit
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
Component location

3. Fault Confirmation
Subtask 27-10-00-700-108-A

A. Test
(1) Do the operational test of the rudder hydraulic actuation AMM 27-24-00-710-001.
(2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-10-00-810-099-A

A. If the BITE test gives the maintenance message L or R PEDALS XDCR UNIT:
(1) In the cockpit, on the CAPT side and on the F/O side, make sure that the pedals are correctly installed AMM 27-21-42-400-001 and AMM 27-21-42-400-002.

If the pedals are correctly installed, continue the procedure.

(2) On the CAPT side and on the F/O side, fully push the left pedal then the right pedal many times and make sure that there is no hard spot on the rudder pedals control linkages :
(a) If you find a hard spot:

disconnect the adjustable bellcrank rod (1),
move the rudder pedals.

1 If you do not find a hard spot:

connect the adjustable bellcrank rod (1),
do the trouble shooting procedure (Ref. TSM TASK 27-20-00-810-801).

2 If you find a hard spot:

disconnect the link rod (2) between the CAPT and F/O pedals,
move the CAPT pedals:

a If you do not find a hard spot:

connect the link rod (2),
do a check to find the mechanical part failure at the F/O pedals and do the corrective action AMM 27-21-42-000-002 and AMM 27-21-42-400-002.

b If you find a hard spot:

do a check to find the mechanical part failure at the CAPT pedals and do the corrective action AMM 27-21-42-000-001 and AMM 27-21-42-400-001.

(3) If the fault continues:

replace the XDCR UNIT-PEDAL POS, L [25CE1] , AMM 27-92-15-000-001 and AMM 27-92-15-400-001.

(4) If the fault continues:

replace the XDCR UNIT-PEDAL POS, R [25CE2] , AMM 27-92-15-000-001 and AMM 27-92-15-400-001.

Subtask 27-10-00-700-109-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:29 UTC