DOC AIRBUS | AMM A320FInspection of the Combustion Chamber and HPT Nozzle Following a Birdstrike/FOD (DAC engine) [CFMB]
TASK 72-42-00-290-005-A-01
Inspection of the Combustion Chamber and HPT Nozzle Following a Birdstrike/FOD (DAC engine)
1. Reason for the Job
This TASK is applicable for NON/P and /P engines equiped with a Double Annular Combustor chamber.
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 72-42-00-941-064-A ** ON A/C NOT FOR ALL
Subtask 72-42-00-010-098-A ** ON A/C NOT FOR ALL
Subtask 72-42-00-410-092-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:42:45 UTC
Inspection of the Combustion Chamber and HPT Nozzle Following a Birdstrike/FOD (DAC engine)
1. Reason for the Job
This TASK is applicable for NON/P and /P engines equiped with a Double Annular Combustor chamber.
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 | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 42 and 38 lbf.in (0.47 and 0.43 m.daN )  | |
| 856A1320 | 1 | BORESCOPE-KIT |
| 856A1322 | 1 | BORESCOPE-LIGHT SOURCE SET |
| 856A1323 | 1 | MONITOR, RESOLUTION BORESCOPE |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| (Material No.CP2619) | Never Seez-Pure Nickel, Special |
| (Material No.CP8001) | 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 72-51-00-290-004-A | Borescope Inspection of High-Pressure Turbine Nozzle Assembly |
| TASK 72-51-00-290-004-A-01 | Borescope Inspection of High-Pressure Turbine Nozzle Assembly |
| TASK 73-11-40-400-002-A | Installation of the Fuel Nozzle for SAC Engines |
| TASK 73-11-40-400-002-A-01 | Installation of the Fuel Nozzle for DAC Engines |
| TASK 73-11-40-790-002-A | Leak Check of the Fuel Nozzles for SAC Engines |
| TASK 73-11-40-790-002-A-01 | Leak Check of the Fuel Nozzles for DAC Engines |
| TASK 74-21-30-000-002-A | Removal of the Spark Igniter |
| TASK 74-21-30-400-002-A | Installation of the Spark Igniter |
| 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 |
| NTM 720000 | |
Combustion Chamber InspectionSubtask 72-42-00-941-064-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 72-42-00-010-096-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)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 72-42-00-040-064-A ** ON A/C NOT FOR ALL Subtask 72-42-00-010-097-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.
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 72-42-00-010-098-A ** ON A/C NOT FOR ALL
A. Remove parts before borescope inspection.
(1) Remove the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug.
(3) Remove both of the spark igniters (Ref. AMM TASK 74-21-30-000-002).
Subtask 72-42-00-290-073-A ** ON A/C NOT FOR ALL (1) Remove the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug.
NOTE: If you remove the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug, you will be required to perform a leak check after this inspection. Use the 6 o'clock borescope port only if necessary.
(2) Remove the borescope plugs from the approximate 1, 3, 6 and 10 o'clock positions. (3) Remove both of the spark igniters (Ref. AMM TASK 74-21-30-000-002).
B. Do a borescope inspection.
(1) Use the 856A1323 MONITOR, RESOLUTION BORESCOPE (856A1323G01) to make sure borescope and the lightsource are serviceable. See the Non-Destructive Test Manual for this procedure NTM 720000.
(2) Connect the fiber light cable to the 856A1320 BORESCOPE-KIT (856A1320P04 or P05) and to the port on the 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322P03, P04 or P07).
(3) Put the rigid borescope of the 856A1320 BORESCOPE-KIT (856A1320P04 or P05), into the left side igniter position and turn on the light source of borescope-lightsource set.
(4) Turn the borescope until you can see the inner and outer deflectors, inner and outer swirlers, inner and outer ferrules and the fuel nozzle tips of the first fuel nozzle that is located clockwise from the igniter.
(5) Inspect the position of the fuel nozzle tips to the bore of the inner and outer ferrules to ensure that they are within the bore of the inner and outer ferrules.
(6) Do the fuel nozzle tip inspection for the fuel nozzle that is counterclockwise from the igniter.
(7) Turn the borescope until you can see the deflectors, swirlers, ferrules and fuel nozzle tips of the second fuel nozzle located clockwise from the igniter.
(8) Do the fuel nozzle tip inspection for the second fuel nozzle that is clockwise from the igniter.
(9) Do the inspection from the right side igniter and the borescope ports.
(10) If any of the results of the inspections are out of limits, remove the fuel nozzle adjacent to the area. Insert the borescope and rotate to view the affected fuel nozzle and inner and outer ferrules.
(11) Inspect the position of the fuel nozzle tips to the bore of the inner and outer ferrules. If the fuel nozzle is out of position, remove the engine. There are no allowable service extensions that apply.
(12) Do a one time borescope inspection between 200-400 hours after the birdstrike occured (Ref. AMM TASK 72-51-00-290-004) for hardware that is NON/P and (Ref. AMM TASK 72-51-00-290-004) or hardware that is /P, but only look for leading edge missing material/burn through.
(a) If no leading edge distress is seen, go back to the usual borescope inspection interval.
(b) If missing material/burn through is seen on the HPT nozzle leading edge wall, report the findings to CFMI for data collection purposes. Do an inspection of the HPT nozzle hardware (Ref. AMM TASK 72-51-00-290-004) for hardware that is NON/P and (Ref. AMM TASK 72-51-00-290-004) for hardware that is /P.
(13) When the inspection is complete, turn off the light source and remove the borescope.
Subtask 72-42-00-410-091-A ** ON A/C NOT FOR ALL (1) Use the 856A1323 MONITOR, RESOLUTION BORESCOPE (856A1323G01) to make sure borescope and the lightsource are serviceable. See the Non-Destructive Test Manual for this procedure NTM 720000.
(2) Connect the fiber light cable to the 856A1320 BORESCOPE-KIT (856A1320P04 or P05) and to the port on the 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322P03, P04 or P07).
(3) Put the rigid borescope of the 856A1320 BORESCOPE-KIT (856A1320P04 or P05), into the left side igniter position and turn on the light source of borescope-lightsource set.
(4) Turn the borescope until you can see the inner and outer deflectors, inner and outer swirlers, inner and outer ferrules and the fuel nozzle tips of the first fuel nozzle that is located clockwise from the igniter.
(5) Inspect the position of the fuel nozzle tips to the bore of the inner and outer ferrules to ensure that they are within the bore of the inner and outer ferrules.
(6) Do the fuel nozzle tip inspection for the fuel nozzle that is counterclockwise from the igniter.
(7) Turn the borescope until you can see the deflectors, swirlers, ferrules and fuel nozzle tips of the second fuel nozzle located clockwise from the igniter.
(8) Do the fuel nozzle tip inspection for the second fuel nozzle that is clockwise from the igniter.
(9) Do the inspection from the right side igniter and the borescope ports.
(10) If any of the results of the inspections are out of limits, remove the fuel nozzle adjacent to the area. Insert the borescope and rotate to view the affected fuel nozzle and inner and outer ferrules.
(11) Inspect the position of the fuel nozzle tips to the bore of the inner and outer ferrules. If the fuel nozzle is out of position, remove the engine. There are no allowable service extensions that apply.
(12) Do a one time borescope inspection between 200-400 hours after the birdstrike occured (Ref. AMM TASK 72-51-00-290-004) for hardware that is NON/P and (Ref. AMM TASK 72-51-00-290-004) or hardware that is /P, but only look for leading edge missing material/burn through.
(a) If no leading edge distress is seen, go back to the usual borescope inspection interval.
(b) If missing material/burn through is seen on the HPT nozzle leading edge wall, report the findings to CFMI for data collection purposes. Do an inspection of the HPT nozzle hardware (Ref. AMM TASK 72-51-00-290-004) for hardware that is NON/P and (Ref. AMM TASK 72-51-00-290-004) for hardware that is /P.
(13) When the inspection is complete, turn off the light source and remove the borescope.
C. Install parts removed for borescope inspection.
(1) Apply a small amount of graphite grease (Material No.CP2101) orCP2619 Never Seez-Pure Nickel, Special
.
(3) Safety the plugs withCP8001 lockwire 0.032 in. (0.8 mm) dia.
(4) If necessary, replace the O-ring on the fuel drain tube and install the tube to the fuel nozzle adjacent to the 6 o'clock borescope plug (Ref. AMM TASK 73-11-40-400-002).
(5) Install the spark igniters (Ref. AMM TASK 74-21-30-400-002).
Subtask 72-42-00-790-058-A ** ON A/C NOT FOR ALL (1) Apply a small amount of graphite grease (Material No.CP2101) or
NOTE: It may be necessary to mix a small amount of water with the magnesium hydroxide to make a paste.
(2) Install the borescope plugs. CAUTION:
BE SURE TO INSTALL THE CORRECT BORESCOPE PLUGS. THE COMBUSTOR BORESCOPE PLUGS DO NOT HAVE A STEM FEATURE. INADVERTENT INSTALLATION OF BORESCOPE PLUGS WITH STEMS FROM OTHER LOCATIONS WILL RESULT IN THE STEM FEATURE BEING BURNED AWAY BY COMBUSTION GASES.
(a) Install the borescope plugs and TORQUE to between 42 and 38 lbf.in (0.47 and 0.43 m.daN ) . (3) Safety the plugs with
(4) If necessary, replace the O-ring on the fuel drain tube and install the tube to the fuel nozzle adjacent to the 6 o'clock borescope plug (Ref. AMM TASK 73-11-40-400-002).
(5) Install the spark igniters (Ref. AMM TASK 74-21-30-400-002).
D. Do a fuel nozzle leak check.
(1) If you removed the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug, do a fuel nozzle leak check (Ref. AMM TASK 73-11-40-790-002).
5. Close-up(1) If you removed the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug, do a fuel nozzle leak check (Ref. AMM TASK 73-11-40-790-002).
Subtask 72-42-00-410-092-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 access platform(s).
Subtask 72-42-00-440-064-A ** ON A/C NOT FOR ALL Subtask 72-42-00-410-093-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 access platform(s).