DOC AIRBUS | AMM A320FRemoval of the Upper Left Thermocouple Lead Assembly [CFMB]
TASK 77-21-10-000-028-A
Removal of the Upper Left Thermocouple Lead Assembly
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 77-21-10-941-064-A ** ON A/C NOT FOR ALL
Subtask 77-21-10-020-060-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:00:16 UTC
Removal of the Upper Left Thermocouple Lead Assembly
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 | CAP - BLANKING |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| 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 |
Upper Left Thermocouple Lead Assembly (Upper Left T495 Sector)Subtask 77-21-10-941-064-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 77-21-10-010-077-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.
Subtask 77-21-10-040-074-A ** ON A/C NOT FOR ALL Subtask 77-21-10-010-090-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.
D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 77-21-10-020-060-A ** ON A/C NOT FOR ALL
A. Removal of the Upper Left Thermocouple Lead Assembly (Upper Left T495 Sector)
(1) Cut and remove the lockwire.
(3) Remove the parts which attach the upper left T495 as follows:
PRE SB CFM 72-0473
(a) Remove the nuts (10) from the studs (30) on LPT case, at the 9:30 and the 10:45 o'clock positions (Detail B)
END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(b) Remove the bolt (65) from the EGT Sensor (Thermocouple) probe braket assy on LPT case, at the 9:30 and the 10:45 o'clock position (Detail B).
(c) Remove the nut (10) and the washer from the stud (30). Keep the bolt and the washer.
END OF POST SB CFM 72-0473
(d) Remove the bolt (50) from the bracket (40) on flange S, at the 10:45 o'clock position (Detail C).
(e) Remove the clamp (60)
(f) Remove the nuts (80) from the flange S, at the 10:30 o'clock position (Detail D).
(g) Remove (70).
(h) Remove the bolt (110) on the bracket (100), on flange S, at the 11 o'clock position (Detail E).
(i) Remove the clamp (120).
(4) Carefully remove the upper left T495 sector (20) from the LPT holes and from the engine.
(5) Install the PLUG - BLANKING and CAP - BLANKING on all disconnected parts.
(1) Cut and remove the lockwire.
NOTE: For engine with EGT sensor (thermocouple) probe brackets repaired, you find a bolt which replaces a stud and a nut (10). A lockwire lock the bolt to a locally manufactured washer located on the nut (10).
You can see engraved on the locally manufactured washer marking area, the number of SB 72-0473.
(2) Disconnect the main junction box lead connector (90) from the upper left T495 sector junction box (parallel junction box) (20). You can see engraved on the locally manufactured washer marking area, the number of SB 72-0473.
(3) Remove the parts which attach the upper left T495 as follows:
PRE SB CFM 72-0473
(a) Remove the nuts (10) from the studs (30) on LPT case, at the 9:30 and the 10:45 o'clock positions (Detail B)
END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(b) Remove the bolt (65) from the EGT Sensor (Thermocouple) probe braket assy on LPT case, at the 9:30 and the 10:45 o'clock position (Detail B).
(c) Remove the nut (10) and the washer from the stud (30). Keep the bolt and the washer.
END OF POST SB CFM 72-0473
(d) Remove the bolt (50) from the bracket (40) on flange S, at the 10:45 o'clock position (Detail C).
(e) Remove the clamp (60)
(f) Remove the nuts (80) from the flange S, at the 10:30 o'clock position (Detail D).
(g) Remove (70).
(h) Remove the bolt (110) on the bracket (100), on flange S, at the 11 o'clock position (Detail E).
(i) Remove the clamp (120).
(4) Carefully remove the upper left T495 sector (20) from the LPT holes and from the engine.
(5) Install the PLUG - BLANKING and CAP - BLANKING on all disconnected parts.