DOC AIRBUS | AMM A320FInstallation of the Lower Left Thermocouple Lead Assembly [CFMB]
TASK 77-21-10-400-027-A
Installation of the Lower Left Thermocouple Lead Assembly
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 77-21-10-860-061-A ** ON A/C NOT FOR ALL
Subtask 77-21-10-420-061-A ** ON A/C NOT FOR ALL
Subtask 77-21-10-410-073-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:17:34 UTC
Installation of the Lower Left Thermocouple Lead Assembly
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| (Material No.CP2544) | Molykote P37 |
| (Material No.CP8001) | lockwire 0.032 in. (0.8 mm) dia. |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| 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 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 73-29-00-710-040-B-02 | Operational Test of the FADEC on the Ground (with Engine Non motoring) |
| 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 |
| SPM 701012350005 | |
Lower Left Thermocouple Lead Assembly (Upper Left T495 Sector)Subtask 77-21-10-860-061-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 77-21-10-010-089-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 77-21-10-040-073-A ** ON A/C NOT FOR ALL 4. Procedure(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 77-21-10-420-061-A ** ON A/C NOT FOR ALL
A. Installation of the Lower Left (L/H) Thermocouple Lead Assembly (Lower Left T495 Sector)
SB CFM 72-0473
(1) Identify if not done before the repair by marking the service bulletin number CFM56-5B 72-0473 on the locally manufactured washer SPM 701012350005.
END OF SB CFM 72-0473
(2) Remove PLUG - BLANKING and CAP - BLANKING.
(3) Lubricate the threads of the LPT case studs (30) with Molykote P37 (Material No.CP2544) .
(5) Carefully install the lower left T495 sector (20) in position on the engine, and engage the lower left T495 sector probes in the LPT case.
(6) Install the parts which attach the lower left T495 sector as follows:
PRE SB CFM 72-0473
(a) Install the nuts (10) on the studs (30) on LPT case, between the 7 and 8:15 o'clock positions (Detail B).
END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(b) Install the bolt (65) on the holes threaded of the EGT sensor (thermocouple) probe brakets, on LPT case, at the 7 and 8:15 o'clock positions (Detail B).
(c) Install the nuts and the washer on the stud. Take care to set the plate of the specific washers turned to head of the bolts with the number engraved at the top.
END OF POST SB CFM 72-0473
(d) Install the clamp (50) on the bracket (40) on flange S, at the 8:30 o'clock position (Detail C).
(e) Install the bolt (60).
(f) Install the bolt(70) on flange S, at the 8 o'clock position (Detail D).
(g) Install the bracket (90) and the nuts (80).
(h) Install the lower extension lead (100) on the bracket (90) on the lower left T49.5 sector (20) junction box at the 8 o'clock position (Detail D).
(i) Install the clamp (110) and the bolt (120).
(j) Install the clamp (160) on the bracket (140), on flange S, at the 7:30 o'clock position (Detail E).
(k) Install the bolt (150).
PRE SB CFM 72-0473
(7) TORQUE the nuts (10), (80) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
.
END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(8) TORQUE the nuts (10) to between 110 and 98 lbf.in (1.24 and 1.11 m.daN ).
(9) TORQUE the bolts to between 110 and 100 lbf.in (1.24 and 1.13 m.daN ).
(10) TORQUE the nuts (80) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN ).
(11) Lock the bolts by a lockwire engaged through the head holes and attached to the locally manufactured washers.
END OF POST SB CFM 72-0473
(12) TORQUE the bolts (60), (120) and (150) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN ).
(13) Make sure that the connectors and receptacles are clean and clear of unwanted materials.
(14) Connect the main junction box lead connector (130) to the lower left T495 sector junction box (parallel junction box) (20).
(15) TORQUE the connecting nut to between 186 and 168 lbf.in (2.10 and 1.90 m.daN ) and safety with CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
Subtask 77-21-10-710-061-A ** ON A/C NOT FOR ALL SB CFM 72-0473
(1) Identify if not done before the repair by marking the service bulletin number CFM56-5B 72-0473 on the locally manufactured washer SPM 701012350005.
END OF SB CFM 72-0473
(2) Remove PLUG - BLANKING and CAP - BLANKING.
(3) Lubricate the threads of the LPT case studs (30) with Molykote P37 (Material No.CP2544) .
NOTE: For engine with EGT sensor (thermocouple) probe brackets repaired, SB 72-0473, a bolt replaces one stud missing and one nut (10) on each bracket.
(4) Lubricate the threads of the bolts (60), (70), (120), (150) with graphite grease (Material No.CP2101) . (5) Carefully install the lower left T495 sector (20) in position on the engine, and engage the lower left T495 sector probes in the LPT case.
(6) Install the parts which attach the lower left T495 sector as follows:
PRE SB CFM 72-0473
(a) Install the nuts (10) on the studs (30) on LPT case, between the 7 and 8:15 o'clock positions (Detail B).
END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(b) Install the bolt (65) on the holes threaded of the EGT sensor (thermocouple) probe brakets, on LPT case, at the 7 and 8:15 o'clock positions (Detail B).
(c) Install the nuts and the washer on the stud. Take care to set the plate of the specific washers turned to head of the bolts with the number engraved at the top.
END OF POST SB CFM 72-0473
(d) Install the clamp (50) on the bracket (40) on flange S, at the 8:30 o'clock position (Detail C).
(e) Install the bolt (60).
(f) Install the bolt(70) on flange S, at the 8 o'clock position (Detail D).
(g) Install the bracket (90) and the nuts (80).
(h) Install the lower extension lead (100) on the bracket (90) on the lower left T49.5 sector (20) junction box at the 8 o'clock position (Detail D).
(i) Install the clamp (110) and the bolt (120).
(j) Install the clamp (160) on the bracket (140), on flange S, at the 7:30 o'clock position (Detail E).
(k) Install the bolt (150).
PRE SB CFM 72-0473
(7) TORQUE the nuts (10), (80) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. END OF PRE SB CFM 72-0473
POST SB CFM 72-0473
(8) TORQUE the nuts (10) to between 110 and 98 lbf.in (1.24 and 1.11 m.daN )
. (9) TORQUE the bolts to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. (10) TORQUE the nuts (80) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. (11) Lock the bolts by a lockwire engaged through the head holes and attached to the locally manufactured washers.
END OF POST SB CFM 72-0473
(12) TORQUE the bolts (60), (120) and (150) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )
. (13) Make sure that the connectors and receptacles are clean and clear of unwanted materials.
(14) Connect the main junction box lead connector (130) to the lower left T495 sector junction box (parallel junction box) (20).
(15) TORQUE the connecting nut to between 186 and 168 lbf.in (2.10 and 1.90 m.daN )
and safety with B. Do an Operational Test of the FADEC Ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
5. Close-upSubtask 77-21-10-410-073-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the WARNING NOTICE(S).
Subtask 77-21-10-440-061-A ** ON A/C NOT FOR ALL Subtask 77-21-10-410-074-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 thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the WARNING NOTICE(S).