Inspection of the Combustion Chamber and HPT Nozzle following a Birdstrike/FOD [CFMI]

TASK 72-42-00-290-003-A
Inspection of the Combustion Chamber and HPT Nozzle following a Birdstrike/FOD

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This inspection is required only after a birdstrike/FOD event where debris is suspected of entering the booster inlet.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 63 and 57 lbf.in (0.71 and 0.64 m.daN )
856A1320	1	BORESCOPE-KIT
856A1321	1	FIBERSCOPE SET
856A1322	1	BORESCOPE-LIGHT SOURCE SET
856A1323	1	MONITOR, RESOLUTION BORESCOPE

B. Consumable Materials

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.

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 72-51-00-290-002-A	Borescope Inspection of the High-Pressure Turbine-Nozzle Assembly
TASK 74-21-30-000-001-A	Removal of the Spark Igniter
TASK 74-21-30-400-001-A	Installation of the Spark Igniter
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
NTM 720000
Combustion Chamber Inspection

3. Job Set-up
Subtask 72-42-00-941-051-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 72-42-00-010-051-A ** ON A/C NOT FOR ALL

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 72-42-00-040-051-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 72-42-00-010-055-A ** ON A/C NOT FOR ALL

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
Subtask 72-42-00-010-052-A ** ON A/C NOT FOR ALL

A. Remove parts before borescope inspection.
(1) Remove all the borescope plugs from the approximate 3 and 6 o'clock position to inspect the combustion chamber.

CAUTION: FOLLOW THE INSTRUCTIONS CAREFULLY FOR INSERTING OR REMOVING THE FLEXIBLE BORESCOPE. DOING THE PROCEDURE INCORRECTLY WILL DAMAGE THE TIP CONTROL FUNCTION.

(2) Remove both of the spark igniters (Ref. AMM TASK 74-21-30-000-001) to inspect the combustion chamber.

NOTE: Use the 856A1323 MONITOR, RESOLUTION BORESCOPE (856A1323G01) to make sure the borescope or the fiberscope and the lightsource are serviceable. See the Non-Destructive Test Manual for this procedure NTM 720000.

Subtask 72-42-00-290-051-A ** ON A/C NOT FOR ALL

B. Do a borescope inspection
(1) Connect the fiber light cable to the 856A1320 BORESCOPE-KIT (856A1320P04/P05) or to the 856A1321 FIBERSCOPE SET (856A1321 P01 or P03), and to the port on 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322P03/P04/P07).
(2) Put the rigid borescope, (856A1320P04/P05), into the left side ignitor position (S11).
(3) Rotate the borescope until you can see the deflector, sleeve, primary swirler, and the fuel nozzle tip that is located clockwise from the igniter.
(4) Inspect the position of the fuel nozzle tip to the bore of the primary swirler for the conditions as follows:

the tip of the fuel nozzle must be within the bore of the primary swirler.
if the fuel nozzle is out of position with the dome, refer to paragraph 4.B.(10)

(5) Do the fuel nozzle tip inspection for the fuel nozzle that is counterclockwise from the igniter.
(6) Rotate the borescope until you can see the second deflector and the second sleeve that is clockwise from the igniter.
(7) Inspect the gap between the deflector and the spectacle plate on the inner liner side. The nominal dimension of the gap is 0.08 in. (2 mm) . Inspect for the following:

the gap must be 0.3 in. (7.6 mm) max at the edge of the deflector.
if the gap is over the max, refer to paragraph 4.B.(10).

(8) Do the deflector gap inspection for the second deflector counterclockwise from the igniter.
(9) Do the inspection 4.B.(1) thru 4.B.(8) to the right side igniter at location (S10) and the borescope ports (S12 - S15).
(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 primary swirler.
(11) Inspect the position of the fuel nozzle tip to the bore of the primary swirler for the conditions as follows:

the tip of the fuel nozzle must be within the bore of the primary swirler.
if the fuel nozzle is out of position with the primary swirler, 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 72-51-00-290-002), 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 72-51-00-290-002).
(13) When the inspection is complete, turn off the 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322P03/P04/P07). Remove the 856A1320 BORESCOPE-KIT (856A1320P04/P05).

Subtask 72-42-00-410-051-A ** ON A/C NOT FOR ALL

C. Install parts removed for borescope inspection.
(1) Apply a small amount of graphite grease (Material No.CP2101) or CP2619Never Seez-Pure Nickel, Special to the borescope plug threads and pressure faces.
(2) Install the borescope plugs and TORQUE to between 63 and 57 lbf.in (0.71 and 0.64 m.daN )

.
(3) Wirelock the plug with CP8001lockwire 0.032 in. (0.8 mm) dia..
(4) Install the spark igniters. (Ref. AMM TASK 74-21-30-400-001).

5. Close-up
Subtask 72-42-00-410-052-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 72-42-00-440-051-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041)

Subtask 72-42-00-410-054-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the warning notice(s).

[Rev.10 from 2021] 2026.04.02 06:33:46 UTC