DOC AIRBUS | AMM A320FReplacement of the Broken Studs of EGT (T49.5) Sensor Bracket Assy [CFMB]
TASK 72-54-00-300-004-A
Replacement of the Broken Studs of EGT (T49.5) Sensor Bracket Assy
1. Reason for the Job
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-54-00-941-069-A ** ON A/C NOT FOR ALL
Subtask 72-54-00-320-052-A ** ON A/C NOT FOR ALL
(2) Install a locally manufactured tool on the remaining serviceable tack welded stud as follows:
(a) Engage correctly the center pin of tooling in the bore which is the EGT (T49.5) sensor probe location.
(b) Tighten the tooling to the LPT case with the original nut on the remaining serviceable tack welded stud.
(c) Make sure the tooling is correctly installed against the LPT case.
(3) Install the correct drill guide sleeve (sleeve is identified as "clearance guide") for a 0.25 in. (6.3500 mm) drill.
(4) Install and attach it with the use of a retaining screw between the drill guide sleeve and the locally manufactured tool.
(5) Do a check from the top of the drill guide sleeve to the EGT sensor probe location of the LPT case.
Subtask 72-54-00-917-054-A ** ON A/C NOT FOR ALL
Subtask 72-54-00-410-100-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:00:15 UTC
Replacement of the Broken Studs of EGT (T49.5) Sensor Bracket Assy
1. Reason for the Job
NOTE: The replacement of broken studs depends on accessibility.
NOTE: Make sure that free access is available for drilling and tapping process.
NOTE: You must discard the repaired bracket assy at the first LPT rotor/stator disassembly.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| 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 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 77-21-10-000-008-A | Removal of the Upper Extension Lead |
| TASK 77-21-10-000-009-A | Removal of the Lower Extension Lead |
| TASK 77-21-10-000-026-A | Removal of the Upper Right Thermocouple Lead Assembly |
| TASK 77-21-10-000-027-A | Removal of the Lower Left Thermocouple Lead Assembly |
| TASK 77-21-10-000-028-A | Removal of the Upper Left Thermocouple Lead Assembly |
| TASK 77-21-10-000-029-A | Removal of the Lower Right Thermocouple Lead Assembly |
| TASK 77-21-10-400-008-A | Installation of the Upper Extension Lead |
| TASK 77-21-10-400-009-A | Installation of the Lower Extension Lead |
| TASK 77-21-10-400-026-A | Installation of the Upper Right Thermocouple Lead Assembly |
| TASK 77-21-10-400-027-A | Installation of the Lower Left Thermocouple Lead Assembly |
| TASK 77-21-10-400-028-A | Installation of the Upper Left Thermocouple Lead Assembly |
| TASK 77-21-10-400-029-A | Installation of the Lower Right Thermocouple Lead Assembly |
| 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 704450320006 | |
| SPM 704460320007 | |
Replacement of the Defective Studs on LPT CaseSubtask 72-54-00-941-069-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 72-54-00-010-099-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. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 72-54-00-040-068-A ** ON A/C NOT FOR ALL Subtask 72-54-00-010-100-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) 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
Subtask 72-54-00-010-101-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
E. Get Access
(1) Remove the T49.5 Thermocouple and Extension Lead Assembly (Ref. AMM TASK 77-21-10-000-008), (Ref. AMM TASK 77-21-10-000-009), (Ref. AMM TASK 77-21-10-000-026), (Ref. AMM TASK 77-21-10-000-027), (Ref. AMM TASK 77-21-10-000-028), (Ref. AMM TASK 77-21-10-000-029), to get access to the studs of the bracket.
4. Procedure(1) Remove the T49.5 Thermocouple and Extension Lead Assembly (Ref. AMM TASK 77-21-10-000-008), (Ref. AMM TASK 77-21-10-000-009), (Ref. AMM TASK 77-21-10-000-026), (Ref. AMM TASK 77-21-10-000-027), (Ref. AMM TASK 77-21-10-000-028), (Ref. AMM TASK 77-21-10-000-029), to get access to the studs of the bracket.
Subtask 72-54-00-320-052-A ** ON A/C NOT FOR ALL
WARNING:
DO NOT BREATHE THE PARTICLES FROM GRINDING OR DRILLING, OR LET THE PARTICLES TOUCH YOU. THE PARTICLES CAN CAUSE DAMAGE, INJURY OR IRRITATION TO YOU. USE PERSONAL PROTECTION EQUIPMENT. USE LOCAL MECHANICAL EXHAUST VENTILATION OR AN APPROVED RESPIRATOR.
WARNING:
WHEN YOU USE COMPRESSED AIR:
A. Preparation for broken stud drilling - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
- DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).
NOTE: It is easier to use a square access to remove the nuts, with bulkheads removed.
(1) Calculate the length of the remaining broken tack welded stud (shank) with the remaining serviceable tack welded stud. (2) Install a locally manufactured tool on the remaining serviceable tack welded stud as follows:
(a) Engage correctly the center pin of tooling in the bore which is the EGT (T49.5) sensor probe location.
(b) Tighten the tooling to the LPT case with the original nut on the remaining serviceable tack welded stud.
(c) Make sure the tooling is correctly installed against the LPT case.
(3) Install the correct drill guide sleeve (sleeve is identified as "clearance guide") for a 0.25 in. (6.3500 mm) drill.
(4) Install and attach it with the use of a retaining screw between the drill guide sleeve and the locally manufactured tool.
(5) Do a check from the top of the drill guide sleeve to the EGT sensor probe location of the LPT case.
B. Drilling of the broken stud shank
(1) Calculate the necessary drill depth (with the dimensions given before and the dimensions shown in the figure) to remove the broken stud shank.
(2) Make a selection to get the correct drilling stop ring for a 0.25 in. (6.3500 mm) drill.
(3) Attach the stop ring to the 0.25 in. (6.3500 mm) diameter drill and set it to the depth as calculated in the paragraph above.
(4) Put the drill into the tooling sleeve.
(5) Drill to a depth permitted by the stop ring to remove the remaining broken stud shank SPM 704450320006.
Subtask 72-54-00-917-055-A ** ON A/C NOT FOR ALL (1) Calculate the necessary drill depth (with the dimensions given before and the dimensions shown in the figure) to remove the broken stud shank.
(2) Make a selection to get the correct drilling stop ring for a 0.25 in. (6.3500 mm) drill.
(3) Attach the stop ring to the 0.25 in. (6.3500 mm) diameter drill and set it to the depth as calculated in the paragraph above.
(4) Put the drill into the tooling sleeve.
(5) Drill to a depth permitted by the stop ring to remove the remaining broken stud shank SPM 704450320006.
C. Preparation for tack welded stud head drilling
(1) Remove the drill guide sleeve (clearance guide).
(2) Replace it with the other drill guide sleeve (identified as "tapping drill guide") for a 0.2110 in. (5.3594 mm) drill.
(3) Calculate the drill depth (with the dimensions given before and the dimensions shown in the figure) to drill through the tack welded stud head and the back plate.
Subtask 72-54-00-917-056-A ** ON A/C NOT FOR ALL (1) Remove the drill guide sleeve (clearance guide).
(2) Replace it with the other drill guide sleeve (identified as "tapping drill guide") for a 0.2110 in. (5.3594 mm) drill.
(3) Calculate the drill depth (with the dimensions given before and the dimensions shown in the figure) to drill through the tack welded stud head and the back plate.
D. Drilling of the tack welded stud head
(1) Install a correct stop ring (stop ring is identified with a drill size of 0.211 in. (5.3594 mm) 0.2110 inch (5,36 mm)) to drill a 0.211 in. (5.3594 mm) diameter and set it to the depth specified as calculated in the "Drilling of the broken stud shank" paragraph B.
(2) Put the drill into the tooling sleeve.
SPM 704450 .
(4) Remove the drill guide sleeve (identified as "tapping drill guide").
(5) Replace it with the other drill guide sleeve (identified as clearance guide).
(6) Remove with a vacuum device all unwanted material.
Subtask 72-54-00-917-057-A ** ON A/C NOT FOR ALL (1) Install a correct stop ring (stop ring is identified with a drill size of 0.211 in. (5.3594 mm) 0.2110 inch (5,36 mm)) to drill a 0.211 in. (5.3594 mm) diameter and set it to the depth specified as calculated in the "Drilling of the broken stud shank" paragraph B.
(2) Put the drill into the tooling sleeve.
CAUTION:
OBEY THE INSTRUCTIONS BELOW TO PREVENT DAMAGE TO ADJACENT PARTS AND TO REMOVE AND DISASSEMBLE THE ENGINE.
(3) Drill through the stud head and the back plate but do not drill the insulation blanket and the other parts below (4) Remove the drill guide sleeve (identified as "tapping drill guide").
(5) Replace it with the other drill guide sleeve (identified as clearance guide).
(6) Remove with a vacuum device all unwanted material.
E. Tapping of the tack welded stud head of the back plate.
(1) Calculate the specified tap depth (with the dimensions given before and the dimensions shown in the figure) to tap through the tack welded stud head and the back plate only.
(2) Set the 0.25 in. (6.3500 mm) stop ring to the specified depth with the tap given in tooling.
(3) Put the tap into the tooling sleeve.
(5) Remove with a vacuum all unwanted material and clean the adjacent areas.
(6) Loosen the nut and remove the tooling.
Subtask 72-54-00-320-053-A ** ON A/C NOT FOR ALL (1) Calculate the specified tap depth (with the dimensions given before and the dimensions shown in the figure) to tap through the tack welded stud head and the back plate only.
(2) Set the 0.25 in. (6.3500 mm) stop ring to the specified depth with the tap given in tooling.
(3) Put the tap into the tooling sleeve.
CAUTION:
OBEY THE INSTRUCTIONS BELOW TO PREVENT DAMAGE TO ADJACENT PARTS AND TO REMOVE AND DISASSEMBLE THE ENGINE.
(4) Tap the head of the tack welded stud and the back plate SPM 704460320007 but do not push the parts below. (5) Remove with a vacuum all unwanted material and clean the adjacent areas.
(6) Loosen the nut and remove the tooling.
F. Installation of the EGT (T49.5) sensor probe and check (1) Install the T49.5 Thermocouple and Extension Lead Assembly (Ref. AMM TASK 77-21-10-400-008), (Ref. AMM TASK 77-21-10-400-009), (Ref. AMM TASK 77-21-10-400-026), (Ref. AMM TASK 77-21-10-400-027), (Ref. AMM TASK 77-21-10-400-028), (Ref. AMM TASK 77-21-10-400-029).
5. Close-upSubtask 72-54-00-410-100-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
Subtask 72-54-00-440-068-A ** ON A/C NOT FOR ALL Subtask 72-54-00-410-101-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