Inspection of the Stage 2-4 Nozzle Segments [CFMB]

TASK 72-54-00-290-007-A-01
Inspection of the Stage 2-4 Nozzle Segments

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

1. Reason for the Job
This Task is only available for CFM56-5BX /P, /3 and /3 PIP engines.
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 60 and 55 lbf.in (0.68 and 0.62 m.daN )
856A1320	1	BORESCOPE-KIT
856A1321	1	FIBERSCOPE SET
856A1322	1	BORESCOPE-LIGHT SOURCE SET

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	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-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 72-00-00-200-025-A	Over-Serviceable-Limit Extensions
TASK 72-00-00-200-025-A-01	Over-Serviceable-Limit Extensions
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
Location of the Borescope Ports and Possible Borescope Access Via One Instrumentation Boss
Illustration of the Low-Pressure Turbine
Illustration of the Low-Pressure Turbine Blades and Nozzle Damage

3. Job Set-up
Subtask 72-54-00-941-067-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 72-54-00-010-093-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-040-066-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-010-094-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 72-54-00-010-095-A ** ON A/C NOT FOR ALL

A. Remove Borescope Plugs

CAUTION: DO NOT REMOVE THE NUTS WHICH HOLD THE LPT BORESCOPE PLUG BOSS. TACK WELDS HOLD THE NUTS IN THEIR POSITIONS. THE REMOVAL OF THE NUTS CAN CAUSE DAMAGE TO THE STUDS.

(1) Let the temperature of the parts decrease to ambient temperature.

PRE SB CFMI 72-0376

(2) Cut and remove the lockwires and remove the LPT borescope plugs S18, S19, S20.

NOTE: The borescope plugs S18, S19, S20 are located approximately at 5:00 o'clock (ALF) on the LPT case, and from front to rear, relate to the 2nd, 3rd and 4th stages of the LPT respectively.

END OF PRE SB CFMI 72-0376

POST SB CFMI 72-0376

(3) Remove the self-locking borescope cap assemblies S18, S19, S20.

NOTE: The borescope cap assemblies S18, S19, S20 are located approximately at 5:00 o'clock (ALF) on the LPT case, and from front to rear, relate to the 2nd, 3rd and 4th stages of the LPT respectively.

END OF SB CFMI 72-0376

Subtask 72-54-00-480-058-A ** ON A/C NOT FOR ALL

B. Installation of the 856A1320 BORESCOPE-KIT (856A1320P04/P05) or 856A1321 FIBERSCOPE SET (856A1321P03/P05/P06) as follows:
(1) Connect the power supply.

CAUTION: BEFORE YOU CONNECT THE POWER SUPPLY TO THE POWER SOURCE, MAKE SURE THAT THE ON/OFF SWITCH IS IN THE OFF POSITION AND THAT THE LIGHT INTENSITY CONTROL IS SET TO THE MINIMUM. MAKE SURE THAT THE PROJECTOR AND THE POWER SUPPLY ARE CORRECTLY GROUNDED. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Connect the power supply.
(2) Connect light source cable to rigid borescope and to port on 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322/P02/P03/P04/P07/P08).
(3) Turn light source on; insert borescope and position it as desired for inspection.
(a) If you use flexible borescope, make sure that it is correctly adjusted.

Subtask 72-54-00-290-058-A ** ON A/C NOT FOR ALL

C. Inspection of the stage 2-4 nozzle segments for the following:

NOTE: You can use a rigid borescope or a flexible borescope to do this inspection.

NOTE: If you use the rigid borescope, the following limits are given for nozzle segments you can see near the borescope holes.

NOTE: LPT stage 2 and 4 nozzles have six airfoils for each segment. LPT stage 3 nozzles have seven airfoils for each segment.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cracks in trailing and leading edges.	Any quantity (leading or trailing edge) if cracks are less than 0.5 in. (12.7 mm) in length (1/3 of the chord width).	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
	One crack maximum for each nozzle segment that is 0.5 in. (12.7 mm) (1/3 of the chord width) to 1.0 in. (25.4 mm) in length (2/3 of the chord width).	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
2.Nicks and/or dents on leading and/or trailing edges.	Any quantity, provided cracks criteria are met.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
3.Nicks and/or dents on concave and/or convex sides.	Any quantity, provided cracks criteria are met.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
4.Burned areas, hot spots, discoloration.	Any quantity, if there is no missing material and you see no bowing and/or melting.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
5.Material particles peeling off on airfoil.	Any quantity, if you see no bowing and/or melting.
6.Corrosion/Pitting.	Any amount, if there is no missing material.

Subtask 72-54-00-080-058-A ** ON A/C NOT FOR ALL

D. Removal of Borescope
(1) When inspection is complete, turn lamp switch off, leave main light source blower on for a while to cool lamp and housing.
(2) Remove the borescope.

Subtask 72-54-00-410-095-A ** ON A/C NOT FOR ALL

E. Install Borescope Plugs

PRE SB CFMI 72-0376

(1) Apply graphite grease (Material No.CP2101) to the threads of the borescope plugs S18, S19, S20 and install on the LPT case.

END OF PRE SB CFMI 72-0376

POST SB CFMI 72-0376

(2) Apply graphite grease (Material No.CP2101) to the threads of the borescope cap assemblies S18, S19, S20 and install on the LPT case.

END OF SB CFMI 72-0376

PRE SB CFMI 72-0376

(3) TORQUE plugs to between 60 and 55 lbf.in (0.68 and 0.62 m.daN )

and safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

END OF PRE SB CFMI 72-0376

POST SB CFMI 72-0376

(4) TORQUE self-locking borescope cap assemblies to between 60 and 55 lbf.in (0.68 and 0.62 m.daN )

NOTE: To achieve the correct installation of a self-locking borescope cap assembly, the slot of its ring must be positioned on the borescope boss lug at the final tightening.

END OF SB CFMI 72-0376

5. Close-up
Subtask 72-54-00-410-096-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 cowl doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-54-00-440-066-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-410-097-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] 2026.04.01 02:43:08 UTC