Inspection of the Stage 1-3 Blades [CFMI]

TASK 72-54-00-290-001-A
Inspection of the Stage 1-3 Blades

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

1. Reason for the Job
Self explanatory
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
856A1322	1	BORESCOPE-LIGHT SOURCE SET

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.
(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-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 72-00-00-200-005-A	Over-Serviceable-Limit Extensions
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
Location of the Borescope Ports and Possible Borescope Access Via One Instrumentation Boss
Low Pressure Turbine Borescope Inspection
Low Pressure Turbine Blades and Nozzle Segment Indications Description

3. Job Set-up
Subtask 72-54-00-941-050-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 72-54-00-010-050-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 72-54-00-040-050-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-010-060-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 72-54-00-010-059-A ** ON A/C NOT FOR ALL

A. Removal of the Borescope Plugs
(1) Let the temperature of parts decrease to ambient temperature.
(2) Cut and remove the lockwires. Then, remove the borescope plug S17 or S18; and remove the plugs S20, S21 and S22.

NOTE: The borescope plugs S17 and S18 are in the same plane and located, respectively, at 5:30 and 8:30 (ALF) immediately in front of the combustion case aft flange. The borescope plugs S20, S21 and S22 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.

Subtask 72-54-00-480-050-A ** ON A/C NOT FOR ALL

B. Install the 856A1320 BORESCOPE-KIT (G01) as follows:
(1) Connect the power supply

CAUTION: BEFORE YOU CONNECT THE POWER SUPPLY TO THE POWER SOURCE BE SURE THE ON-OFF SWITCH IS IN THE OFF POSITION AND LIGHT INTENSITY CONTROL IS SET TO MINIMUM. MAKE SURE THAT PROJECTOR AND POWER SUPPLY ARE CORRECTLY GROUNDED.

(a) Connect the power supply to a grounded, power source.
(2) Connect light source cable to rigid borescope and to port on 856A1322 BORESCOPE-LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08).
(3) Turn light source on; insert borescope and position it as desired for inspection.

Subtask 72-54-00-290-050-A ** ON A/C NOT FOR ALL

C. The stage 1-3 LPT rotor blades are long span blades. To fully examine the airfoil surface, it is recommended to do as follows:
(1) Turn the fan rotor slowly and smoothly to examine the blades.
(2) Change the probe engagement depth so as to see the blade airfoils as they move in front of the probe.
(3) While you adjust the probe engagement depth, turn the probe about its axis (azimuth) to get a maximum view, for a given turn speed of the rotor.

NOTE: The blade span increases from the 2nd to the 3rd LPT stages. As the full engagement of the probe is necessary, you may have to make more than one turn of the LPT rotor to see all the blade airfoils.

(4) When you look at the leading edges of the blades, turn the rotor so that their concave side (pressure face) comes toward the borescope.
(5) To look at the trailing edges, turn the rotor in the opposite direction so that the convex side (suction face) of the blades comes toward the borescope.
(6) Do the inspection of the stage 1-3 blades for damage as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cracks	Not serviceable	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
2.Nicks on concave or convex sides. Does not include areas E.	Not more than 0.01 in. (0.25 mm) deep for stage 1 and 0.02 in. (0.5 mm) deep for stages 2-3.	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
3.Dents on concave or convex sides. Does not include areas E.	Not more than 0.01 in. (0.25 mm) deep	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
4.Nicks and/or dents on leading or trailing edges. Does not include areas E.	Not more than 0.02 in. (0.5 mm) deep	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
5.Nicks and/or dents in areas E.	Not more than 0.01 in. (0.25 mm) deep	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
6.Rubbing on leading edge platform, leading edge root radius in area E.	Not more than 0.01 in (0.25 mm) deep.	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
7.Distortion of leading edges caused by overtemperature.	Not serviceable	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
8.Pretwist clearances such that adjacent interlocks do not touch each other.	0.1 in. (2.54 mm) max. of total gap for stage 1. Not serviceable for stages 2-3.	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
9.Bent or bowed airfoil.	Tip shroud out-of-flush not more than 0.015 in. (0.38 mm)	See limit extensions (Ref. AMM TASK 72-00-00-200-005)
10.Deposit material, peeling off on airfoil.	Any amount provided there is no evidence of bowing and/or melting.
11.Blades seal teeth wear.	1/2 of tooth height worn if only one stage is affected. 1/3 of tooth height worn if 2 stages are affected. 1/4 of tooth height worn if 3 stages are affected.

Subtask 72-54-00-080-050-A ** ON A/C NOT FOR ALL

D. Removal of the 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 72-54-00-410-050-A ** ON A/C NOT FOR ALL

E. Install the Borescope Plugs
(1) Apply graphite grease (Material No.CP2101) or CP2619Never Seez-Pure Nickel, Special to the threads of the borescope plugs S17 (or S18), S20, S21, S22 and install on the combustion case (S17 or S18) and on the LPT case (S20, S21, S22).
(2) TORQUE plugs to between 60 and 55 lbf.in (0.68 and 0.62 m.daN )

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

5. Close-up
Subtask 72-54-00-410-051-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 72-54-00-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-410-060-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 12:58:33 UTC