DOC AIRBUS | AMM A320FInspection of the T25 Temperature Sensor [CFMB]
TASK 73-21-20-210-002-A
Inspection of the T25 Temperature Sensor
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 73-21-20-941-053-A ** ON A/C NOT FOR ALL
Subtask 73-21-20-210-051-A ** ON A/C NOT FOR ALL
Subtask 73-21-20-410-058-A ** ON A/C NOT FOR ALL Subtask 73-21-20-410-061-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:58:27 UTC
Inspection of the T25 Temperature Sensor
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | MEGOHMMETER 200 MOHMS - 500 VDC, 0.001 A MAX |
| No specific | AR | OHMMETER MULTIRANGE |
| No specific | AR | PLIERS - CONNECTOR, JAW, SOFT |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1039) | acetone |
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2010) | white spirit |
| (Material No.CP2559) | ardrox 552 |
| (Material No.CP2560) | turco ind 79 |
| (Material No.CP2566) | mag-chem teksol |
| (Material No.CP2584) | degreasol 99 R |
| (Material No.CP2656) | mag-chem skysol |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 73-21-20-000-002-A | Removal of the T25 Temperature Sensor |
| TASK 73-21-20-400-002-A | Installation of the T25 Temperature Sensor |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
T25 SensorSubtask 73-21-20-941-053-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 73-21-20-010-063-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 73-21-20-040-055-A ** ON A/C NOT FOR ALL Subtask 73-21-20-010-057-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
D. Open the right thrust reverser doors (Ref. AMM TASK 78-36-00-010-040).
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR
Subtask 73-21-20-010-061-A ** ON A/C NOT FOR ALL 4. Procedure(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR
Subtask 73-21-20-210-051-A ** ON A/C NOT FOR ALL
A. Do an Inspection of the T25 Sensor
Subtask 73-21-20-210-053-A ** ON A/C NOT FOR ALL | INSPECT/CHECK | MAXIMUM SERVICEABLE LIMITS | REMARKS |
|---|---|---|
| 1.All areas for: | | |
| A.Cracks | Not serviceable | Replace T25 sensor |
| B.Dirt build-up in air inlet | Air must circulate freely | Clean T25 sensor with bristle brush and isopropyl alcohol (Material No.CP1041) or acetone (Material No.CP1039) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or white spirit (Material No.CP2010) . |
| 2.Electrical connector threads for: | | |
| Damage | 30 percent damage in one lead-in thread or 20 percent damage on several threads | Chase threads if in limits, or replace T25 sensor (Ref. AMM TASK 73-21-20-000-002) and (Ref. AMM TASK 73-21-20-400-002) |
| 3.Electrical connector pins for: | | |
| Bend Seizure Breakage | Must engage freely in related female contacts | Straighten bent pins. Replace T25 sensor if pins are broken, eroded or seized |
| 4.Electrical connector well for: | | |
| Dirt | None permitted | Clean with brush and isopropyl alcohol (Material No.CP1041) or acetone (Material No.CP1039) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or white spirit (Material No.CP2010) . |
B. Do an Electrical Test of the T25 Sensor
(1) Disconnect the CJ11R harness and CJ12R harness connectors from the T25 sensor connectors. If necessary, use PLIERS - CONNECTOR, JAW, SOFT.
(2) Measure the continuity resistance with an OHMMETER MULTIRANGE between pin 1 and pin 2 at the T25 sensor Channel A and Channel B receptacle.
(3) Measure the insulation resistance at Channel A and Channel B receptacle.
(a) Use a MEGOHMMETER 200 MOHMS - 500 VDC, 0.001 A MAX under 50 VDC.
(b) Set the megohmmeter to 0-100 Meghom range
(4) Replace T25 sensor if it is not within the limits.
(5) Connect the CJ11R harness (Channel A) and CJ12R harness (Channel B) connector to the T25 sensor connectors.
5. Close-up(1) Disconnect the CJ11R harness and CJ12R harness connectors from the T25 sensor connectors. If necessary, use PLIERS - CONNECTOR, JAW, SOFT.
(2) Measure the continuity resistance with an OHMMETER MULTIRANGE between pin 1 and pin 2 at the T25 sensor Channel A and Channel B receptacle.
| Receptacle | Pins | Continuity Resistance |
|---|---|---|
| Channel A | Pin 1 to pin 2 | Resistance 160 Ohm to 250 Ohm agrees with Channel B plus or minus 4 Ohm |
| Channel B | Pin 1 to pin 2 | Resistance 160 Ohm to 250 Ohm agrees with Channel A plus or minus 4 Ohm |
(a) Use a MEGOHMMETER 200 MOHMS - 500 VDC, 0.001 A MAX under 50 VDC.
(b) Set the megohmmeter to 0-100 Meghom range
| Receptacle | Pins | Insulation Resistance |
|---|---|---|
| Channel A | Pin 1 to connector body | Resistance higher than 10 Meghom |
| Channel B | Pin 1 to connector body | Resistance higher than 10 Meghom |
(5) Connect the CJ11R harness (Channel A) and CJ12R harness (Channel B) connector to the T25 sensor connectors.
Subtask 73-21-20-410-058-A ** ON A/C NOT FOR ALL Subtask 73-21-20-410-061-A ** ON A/C NOT FOR ALL
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR
Subtask 73-21-20-440-053-A ** ON A/C NOT FOR ALL Subtask 73-21-20-410-059-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR