DOC AIRBUS | AMM A320FAdjustment of the Rods of the Alternate Brake-Pedal Transmitter-Unit
TASK 27-21-00-820-803-A
Adjustment of the Rods of the Alternate Brake-Pedal Transmitter-Unit
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 27-21-00-860-080-A
Subtask 27-21-00-760-052-A
Subtask 27-21-00-410-065-A
[Rev.10 from 2021]
2026.04.01 12:32:07 UTC
Adjustment of the Rods of the Alternate Brake-Pedal Transmitter-Unit
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 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 811 |
| 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 32-43-00-710-001-A | Operational Check of Alternate Braking System |
| ASM 324303 | |
Adjustment of the Alternate Brake Pedal Transmitter UnitSubtask 27-21-00-860-080-A
A. Aircraft Maintenance Configuration
(1) Energize the Ground Service Network (Ref. AMM TASK 24-42-00-861-001).
(2) Put WARNING NOTICE(S) in the cockpit to tell persons not to operate the brake pedals.
Subtask 27-21-00-010-071-A (1) Energize the Ground Service Network (Ref. AMM TASK 24-42-00-861-001).
(2) Put WARNING NOTICE(S) in the cockpit to tell persons not to operate the brake pedals.
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 27-21-00-865-064-A (1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 811.
(2) Open the access door 811.
C. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | L/G/Y BRK/PRESS/IND | 61GG | C10 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | ABCU &/Y BRK/PRESS IND | 61GG | C10 |
| ** 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 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P31 |
Subtask 27-21-00-760-052-A
A. Electrical Tests
(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 alternate brake-pedal transmitter-unit (2).
(3) Disconnect the electrical connector A (5) from the alternate brake-pedal transmitter unit (2) and put PLUG - BLANKING on the disconnected line end.
(4) On the alternate 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 10V of the POWER SUPPLY UNIT at pin G ASM 324303.
(b) Connect the 0V of the POWER SUPPLY UNIT at pin U ASM 324303.
(5) On the alternate brake-pedal transmitter-unit (2), at the receptacle A, connect the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE and record the values:
(a) For the L/H Rod, record the Lp value:
(a) If one or two of the measured values is(are) not in the tolerances:
Subtask 27-21-00-820-065-A (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 alternate brake-pedal transmitter-unit (2).
(3) Disconnect the electrical connector A (5) from the alternate brake-pedal transmitter unit (2) and put PLUG - BLANKING on the disconnected line end.
(4) On the alternate 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 10V of the POWER SUPPLY UNIT at pin G ASM 324303.
(b) Connect the 0V of the POWER SUPPLY UNIT at pin U ASM 324303.
(5) On the alternate brake-pedal transmitter-unit (2), at the receptacle A, connect the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE and record the values:
(a) For the L/H Rod, record the Lp value:
- between pin A (output+) and pin U (0V) ASM 324303.
- between pin M (output+) and pin U (0V) ASM 324303.
(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).
- Go to para. 4.C (the adjustment of the rod(s) is not necessary).
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 perform the rod(s) adjustment.
(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.
Subtask 27-21-00-760-053-A (1) Cut and discard the lockwire of the rod(s) (4) which have to be adjusted.
(2) Loosen the nuts (3) to perform the rod(s) adjustment.
(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.
Do again the adjustment if necessary.
C. Electrical tests
(1) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (1) from the alternate 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.
(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.
(a) Connect the 10 V of the POWER SUPPLY UNIT at pin G ASM 324303.
(b) Connect the 0 V of the POWER SUPPLY UNIT at pin U ASM 324303.
(8) On the alternate brake-pedal transmitter-unit (2), at the receptacle A, connect the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE and record the values:
(a) For the L/H Rod, record the Lp value:
(10) On the CAPT side, release the brake pedals.
(13) Connect the electrical connector A (5) to the pedal transmitter unit (2).
(14) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) from the bellcrank yaw/brake.
Subtask 27-21-00-865-065-A (1) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (1) from the alternate 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.
(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 alternate 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 324303.
(b) Connect the 0 V of the POWER SUPPLY UNIT at pin U ASM 324303.
(8) On the alternate brake-pedal transmitter-unit (2), at the receptacle A, connect the MULTIMETER 0.002 V TO 20 V, 10 A - MULTIRANGE and record the values:
(a) For the L/H Rod, record the Lp value:
- between pin A (output+) and pin U (0V) ASM 324303.
- between pin M (output+) and pin U (0V) ASM 324303.
(10) On the CAPT side, release the brake pedals.
NOTE: The triple bellcranks go back to "0 braking" limit stop position.
(11) Make sure that the measured values are in the range 1.57V +/- 0.03V. - If the values are not in the tolerances, do again the adjustment of the rod(s) (para. 4.B.).
(13) Connect the electrical connector A (5) to the pedal transmitter unit (2).
(14) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) from the bellcrank yaw/brake.
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 27-21-00-710-064-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | L/G/Y BRK/PRESS/IND | 61GG | C10 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | ABCU &/Y BRK/PRESS IND | 61GG | C10 |
| ** 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 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P31 |
E. Tests
(1) Do the operational test of the Alternate Braking System (Ref. AMM TASK 32-43-00-710-001).
5. Close-up(1) Do the operational test of the Alternate Braking System (Ref. AMM TASK 32-43-00-710-001).
Subtask 27-21-00-410-065-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 27-21-00-860-081-A (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).
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).
(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).