Failure of the BRK ALTN PRESS TRANSDUCER

TASK 32-44-00-810-811-A
Failure of the BRK ALTN PRESS TRANSDUCER

1. Possible Causes

PRESS XDCR-BRK, YELLOW L [101GG]
wiring between pin 2 of the circuit breaker (61GG) and pin AA of the Yellow left brake pressure-transducer (101GG).
C/B-ABCU &/Y BRK/PRESS IND [61GG]
BSCU [10GG]
ABCU [95GG]
IND-BRK YELLOW PRESS TRIPLE [60GG]
SDAC-1 [1WV1]
SDAC-2 [1WV2]
wiring between pins D and E of connector A of the Yellow left brake pressure-transducer (101GG) and pins E and L of connector 19 of the 1101VT
wiring between pins F and K of connector A of the brake Yellow pressure triple indicator (60GG) and pins C and K of connector 19 of the 1101VT
wiring between pins 10A and 10B of connector AC of the BSCU (10GG) and pins A and H of connector 19 of the 1101VT
wiring between pins BB and EE of connector A of the ABCU (95GG) and pins B and J of connector 19 of the 1101VT
wiring between pins 13H and 13G of connector AE of the SDAC1 (1WV1) and pins D and M of connector 18 of the 1101VT
wiring between pins 13H and 13G of connector AE of the SDAC2 (1WV2) and pins D and M of connector 18 of the 1101VT

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 205221
ESPM 205222
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-23-00-864-001	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
AMM 29-24-00-863-001	Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 29-24-00-864-001	Depressurize the Yellow Hydraulic System
AWM 315470
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC
AMM 31-60-00-860-001	EIS Start Procedure
AMM 32-42-34-000-001	Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001	Installation of the Braking/Steering Control Unit (BSCU)
ASM 324302
AMM 32-43-34-000-001	Removal of the Alternate Braking Control Unit (ABCU)
AMM 32-43-34-400-001	Installation of the Alternate Braking Control Unit (ABCU)
ASM 324401
AMM 32-44-19-000-001	Removal of the Pressure Transducer
AMM 32-44-19-400-001	Installation of the Pressure Transducer
AMM 32-44-21-000-001	Removal of the Brake Yellow Pressure Triple Indicator
AMM 32-44-21-400-001	Installation of the Brake Yellow Pressure Triple Indicator
AMM 32-46-00-740-002	BITE Test of the BSCU - Ground Scanning

3. Fault Confirmation

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. MOVEMENT OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

Subtask 32-44-00-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) On the panel 400VU, make sure that the Landing Gear control lever is at DOWN.
(3) On the panel 402VU, make sure that the A/SKID & N/W STRG switch is at ON.
(4) On the panel 110VU, make sure that the PARK BRK control switch is at OFF.
(5) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(6) Make sure that the Green hydraulic system is depressurized:

On the overhead panel 40VU, set the PTU pushbutton switch to OFF and make sure that the OFF legend comes on.

Subtask 32-44-00-710-065-A ** ON A/C NOT FOR ALL

B. Test
(1) Do a reset of the BSCU (10GG):

Set the A/SKID & N/W STRG switch to OFF then ON.

(2) Pressurize the Yellow hydraulic system
AMM 29-24-00-863-001.
(3) Push the brake pedals on the Captain or First Officer side.
(4) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
(5) Depressurize the Yellow hydraulic system
AMM 29-24-00-864-001.

4. Fault Isolation
Subtask 32-44-00-865-054-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10

Subtask 32-44-00-810-062-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message BRK ALTN PRESS TRANSDUCER (101GG):

Do a check for 28VDC at pin A/A of the Yellow left brake pressure-transducer (101GG) ASM 324401.

(1) If there is 28VDC:

Do a check for a ground signal at pin A/B of the Yellow left brake pressure-transducer (101GG).

(a) If there is a ground signal:

Replace the PRESS XDCR-BRK, YELLOW L [101GG] AMM 32-44-19-000-001 AMM 32-44-19-400-001.

(2) If there is no 28VDC:

Do a check for 28VDC at pin 2 of the circuit breaker of the landing-gear Yellow brake pressure-indicator (61GG) ASM 324401.

(a) If there is 28VDC:

Repair the wiring between pin 2 of the circuit breaker (61GG) and pin AA of the Yellow left brake pressure-transducer (101GG).

(b) If there is no 28VDC:

Replace the C/B-ABCU &/Y BRK/PRESS IND [61GG] ASM 324401.

(3) Do the test given in Para.3.B.
(4) If the fault continues, do a visual inspection of:
(a) The connector of the Yellow left brake pressure-transducer (101GG):
1 Do a check of pins D and E and repair, if necessary ASM 324401.
2 If there is contamination, corrosion, bent or broken pins:

Repair or replace the PRESS XDCR-BRK, YELLOW L [101GG] AMM 32-44-19-000-001 AMM 32-44-19-400-001.

(b) The connectors of the BSCU (10GG):
1 Do a check of pins 10A and 10B of connector AC and repair, if necessary ASM 324302.
2 If there is contamination, corrosion, bent or broken pins:

Repair or replace the BSCU [10GG] , if necessary AMM 32-42-34-000-001 AMM 32-42-34-400-001.

(c) The connectors of the ABCU (95GG):
1 Do a check of pins BB and EE of connector A and repair, if necessary ASM 324302.
2 If there is contamination, corrosion, bent or broken pins:

Repair or replace the ABCU [95GG] AMM 32-43-34-000-001 AMM 32-43-34-400-001.

(d) The connectors of the brake Yellow pressure triple-indicator (60GG):
1 Do a check of pins F and K of connector A and repair, if necessary ASM 324401.
2 If there is contamination, corrosion, bent or broken pins:

Repair or replace the IND-BRK YELLOW PRESS TRIPLE [60GG] AMM 32-44-21-000-001 AMM 32-44-21-400-001.

(e) The connectors of the SDAC-1 [1WV1] and SDAC-2 [1WV2] :
1 Do a check of pins 13H and 13G of connector AE of SDAC-1 [1WV1] and SDAC-2 [1WV2] and repair if necessary AWM 315470.
2 If there is contamination, corrosion, bent or broken pins:

Repair or replace the SDAC-1 [1WV1] or SDAC-2 [1WV2] AMM 31-55-34-000-001 AMM 31-55-34-400-001.

(f) Do the test given in Para.3.B.

Subtask 32-44-00-710-066-A ** ON A/C NOT FOR ALL

C. If the fault continues, do a continuity check ESPM 205221 and an insulation test ESPM 205222 between:
(1) Pins D and E of connector A of the Yellow left brake pressure-transducer (101GG) and pins E and L of connector 19 of the 1101VT:
(a) If there is a fault:

Repair the wiring between pins D and E of connector A of the Yellow left brake pressure-transducer (101GG) and pins E and L of connector 19 of the 1101VT ASM 324401.

(2) Pins C and K of connector 19 of the 1101VT and pins F and K of connector A of the brake Yellow pressure triple indicator (60GG):
(a) If there is a fault:

Repair the wiring between pins F and K of connector A of the brake Yellow pressure triple indicator (60GG) and pins C and K of connector 19 of the 1101VT ASM 324401.

(3) Pins A and H of connector 19 of the 1101VT and pins 10A and 10B of connector AC of the BSCU (10GG):
(a) If there is a fault:

Repair the wiring between pins 10A and 10B of connector AC of the BSCU (10GG) and pins A and H of connector 19 of the 1101VT ASM 324302.

(4) Pins B and J of connector 19 of the 1101VT and pins BB and EE of connector A of the ABCU (95GG):
(a) If there is a fault:

Repair the wiring between pins BB and EE of connector A of the ABCU (95GG) and pins B and J of connector 19 of the 1101VT ASM 324302.

(5) Pins D and M of connector 18 of the 1101VT and pins 13H and 13G of connector AE of the SDAC-1 [1WV1] and SDAC-2 [1WV2] :
(a) If there is a fault:

Repair the wiring between pins 13H and 13G of connector AE of the SDAC1 (1WV1) and pins D and M of connector 18 of the 1101VT and the wiring between pins 13H and 13G of connector AE of the SDAC2 (1WV2) and pins D and M of connector 18 of the 1101VT AWM 315470.

(6) Do the test given in Para.3.B.

Subtask 32-44-00-810-064-A ** ON A/C NOT FOR ALL

D. If the fault continues:
(1) If you did not replace the Yellow left brake pressure-transducer (101GG):
(a) Replace the PRESS XDCR-BRK, YELLOW L [101GG] AMM 32-44-19-000-001 AMM 32-44-19-400-001.
(b) Do the test given in Para.3.B.
(2) If the fault continues:
(a) If you did not replace the BSCU (10GG):
1 Replace the BSCU [10GG] AMM 32-42-34-000-001 AMM 32-42-34-400-001.
(b) Do the test given in Para.3.B.
(3) If the fault continues:
(a) If you did not replace the brake Yellow pressure triple-indicator (60GG):
1 Replace the IND-BRK YELLOW PRESS TRIPLE [60GG] AMM 32-44-21-000-001 AMM 32-44-21-400-001.
(b) Do the test given in Para.3.B.
(4) If the fault continues:
(a) If you did not replace the ABCU (95GG):
1 Replace the ABCU [95GG] AMM 32-43-34-000-001 AMM 32-43-34-400-001.
(b) Do the test given in Para.3.B.
(5) If the fault continues:
(a) If you did not replace the SDAC1 (1WV1) and SDAC2 (1WV2):
1 Replace the SDAC-1 [1WV1] and SDAC-2 [1WV2] AMM 31-55-34-000-001 AMM 31-55-34-400-001.
(b) Do the test given in Para.3.B.

5. Close-up
Subtask 32-44-00-860-058-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Depressurize the aircraft hydraulic systems AMM 29-23-00-864-001.
(2) De-energize the aircraft electrical circuits AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:31:44 UTC