Adjustment of the Rods of the Normal Brake-Pedal Transmitter-Unit

TASK 27-21-00-820-802-A
Adjustment of the Rods of the Normal Brake-Pedal Transmitter-Unit

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE
No specific	AR	PLUG - BLANKING
No specific	1	POWER SUPPLY UNIT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98A27901002000	2	PIN-RIGGING,RUDDER CONTROL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 32-42-00-710-001-A	Operational Check of the Normal Braking System
TASK 32-46-00-740-001-A	BITE Test of the BSCU
ASM 324201
Adjustment of the Normal Brake Pedal Transmitter Unit
Component Location
BSCU System Data page

3. Job Set-up
Subtask 27-21-00-861-059-A

A. Energize the Ground Service Network (Ref. AMM TASK 24-42-00-861-001).

Subtask 27-21-00-010-070-A

B. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 811.
(2) Open the access door 811.

Subtask 27-21-00-865-062-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 27-21-00-860-078-A

D. Safety Precautions
(1) Put WARNING NOTICE(S) to tell persons not to operate the brake pedals.

4. Procedure
Subtask 27-21-00-760-050-A

A. Electrical Check
(1) Make sure that, in the cockpit, the CAPT and F/O pedals are in neutral position.
(2) Install the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (1) on the normal brake-pedal transmitter-unit (2).
(3) Disconnect the electrical connector A (5) from the transmitter unit (2).

NOTE: The transmitter unit (9GG) can also have an electrical connector B.

(4) Put PLUG - BLANKING on the disconnected line end.
(5) On the normal brake-pedal transmitter-unit (2), at the receptacle A, apply a stabilized voltage of 10 V +/- 0.1 V with the POWER SUPPLY UNIT as follow:
(a) Connect the 10 V of the POWER SUPPLY UNIT at pin G ASM 324201.
(b) Connect the 0 V of the POWER SUPPLY UNIT at pin U ASM 324201.
(6) On the normal brake pedal transmitter unit (2), at the receptacle A, connect the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE to control the values that follow:
(a) For the LH Rod:

Between pin A (output+) and pin U (0V) ASM 324201.

(b) For the RH Rod:

Between pin M (output+) and pin U (0V) ASM 324201.

(7) Make sure that the measured values are in the range 1.57V +/- 0.03V:
(a) If one or two of the measured values is(are) not in the tolerances:

Continue the procedure to do the adjustment of the rod(s).

(b) If the measured values are in the tolerances:

Go to para. 4.C (the adjustment of the rod(s) is not necessary).

Subtask 27-21-00-820-064-A

B. Adjustment of the Rod(s)
(1) Cut and discard the lockwire of the rod(s) (4) which have to be adjusted.
(2) Loosen the nuts (3) to adjust the rod(s).
(3) Adjust the distance between the centers of the rod(s) (4) to get 1.57 +/- 0.03V on the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE.
(4) Tighten the nuts (3) and secure the rod(s) (4) with the lockwire.

NOTE: The tightening of the nuts can slightly modify the voltage value.
Do again the adjustment if necessary.

Subtask 27-21-00-760-051-A

C. Electrical tests
(1) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (1) from the normal brake-pedal transmitter-unit (2) and the WARNING NOTICE(S) in the cockpit.
(2) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(3) On the center pedestal, on the panel 110VU, make sure that the RUD TRIM indicator shows 0.
(4) Install the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) on the bellcrank yaw/brake (see detail B).

Component Location

(5) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
(6) On the CAPT side, fully push the two brake pedals and hold them in this position.

NOTE: This brings the triple bellcranks to "MAX. braking" limit stop position.

(7) On the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE, make sure that the cursor output voltages of the L/H rod and the R/H rod are equal to 10V +/- 0.2V.
(8) On the CAPT side, release the brake pedals.

NOTE: The triple bellcranks go back to "0 braking" limit stop position.

(9) On the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE, make sure that the cursor output voltages of the L/H rod and/or the R/H rod are in the range 1.57V +/- 0.03V.

If the values are not correct, do again the para. 4.B. (Adjustment of the Rod(s)).

(10) Remove the POWER SUPPLY UNIT and the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE.
(11) Connect the electrical connector A (5) to the pedal transmitter unit (2) .
(12) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) from the bellcrank yaw/brake.

Subtask 27-21-00-865-063-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 27-21-00-700-051-A

E. Do the steps that follow:

BSCU System Data page

(1) On the MCDU, on the BSCU SYSTEM DATA page, do a check of the maximum pedal deflection values:

ACTION	RESULT
1.On the center pedestal, on the MCDU, push the key adjacent to the CFDS indication.	The CFDS page comes into view.
2.Push the line key adjacent to the SYSTEM REPORT / TEST indication.	The SYSTEM REPORT / TEST page comes into view.
3.Push the line key adjacent to the L/G indication.	The L/G page comes into view.
4.Push the line key adjacent to the BSCU2 indication.	The BSCU2 page comes into view.
5.Push the line key adjacent to the SPECIFIC DATA indication.	The SPECIFIC DATA page comes into view.
6.Push the line key adjacent to the SYSTEM DATA indication.	The SYSTEM DATA page comes into view.

(2) On the CAPT side, fully push the two brake pedals and hold them in this position.
(3) On the MCDU, record the values of the L/H and R/H pedals, and make sure that the values are higher than 94%.

NOTE: On the SYSTEM DATA page:

the L/H brake pedal position is on the R/H side of the screen.
the R/H brake pedal position is on the L/H side of the screen.

(a) Release the brake pedals and then, on the MCDU, at SYSTEM DATA page 1/3, do a REFRESH.
(b) Make sure that L/H and R/H pedals values are between 14.2% and 17.2%.

NOTE: The triple bellcranks go back to "0 braking" limit stop position.

Subtask 27-21-00-740-050-A

F. Tests
(1) Do the BITE test with the system 1 and system 2 of the BSCU (Ref. AMM TASK 32-46-00-740-001).
(2) Do the operational test of the normal braking system (Ref. AMM TASK 32-42-00-710-001).

5. Close-up
Subtask 27-21-00-410-064-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 811.
(3) Remove the access platform(s).

Subtask 27-21-00-860-079-A

B. Put the aircraft back to its initial configuration.
(1) Make sure that all the WARNING NOTICE(S) are removed.
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:47:58 UTC