Repair of Broken Borescope Plug [CFMB]

TASK 72-31-00-300-002-A
Repair of Broken Borescope Plug

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	DRIVE - SQUARE, T-HANDLE
No specific	AR	LOCALLY MANUFACTURED - TAPERED ROD DIA 0,37IN (9,4 MM)
No specific	AR	WARNING NOTICE(S)
No specific	AR	WRENCH - DEEP SOCKET
No specific	Torque wrench: range to between 20 and 15 lbf.in (0.23 and 0.17 m.daN )
No specific	Torque wrench: range to between 63 and 57 lbf.in (0.71 and 0.64 m.daN )
No specific	Torque wrench: range to between 85 and 75 lbf.in (0.96 and 0.85 m.daN )

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-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
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
Locally Manufactured Deep Socket Wrench
Broken Borescope Plug Removal

3. Job Set-up
Subtask 72-31-00-941-053-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 72-31-00-010-058-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.
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-31-00-040-053-A ** ON A/C NOT FOR ALL

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

Subtask 72-31-00-010-059-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 72-31-00-300-051-A ** ON A/C NOT FOR ALL

A. Remove the broken borescope plug as follows:
(1) Remove the retaining ring, if necessary.
(2) Install the locally manufactured WRENCH - DEEP SOCKET on the inner plug.

Broken Borescope Plug Removal ** ON A/C NOT FOR ALL

(3) Install a DRIVE - SQUARE, T-HANDLE on the socket wrench.
(4) Remove the borescope plug.

Subtask 72-31-00-420-064-A ** ON A/C NOT FOR ALL

B. Install a replacement borescope plug as follows:
(1) Install the stage 1 through 5 borescope plugs (S2 through S6) as follows:
(a) Apply graphite grease (Material No.CP2101) CP2619Never Seez-Pure Nickel, Special to the threads and pressure face of the borescope plug.
(b) Install the borescope plug in the borescope port. Tighten the borescope plug by hand.
(c) TORQUE the borescope plug to between 63 and 57 lbf.in (0.71 and 0.64 m.daN )

.
(d) Wirelock the borescope plug. Use CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(2) Install the stage 6, 7 and 8 borescope plugs (S7, S8 and S9) as follows:

CAUTION: MAKE SURE YOU FULLY SCREW THE INNER CAP IN. IF NOT FULLY SCREWED IN, THE INNER CAP OF THE BORESCOPE PLUG WILL DEFLECT THE COMPRESSOR REAR CASE AS THE OUTER CAP IS TIGHTENED. THIS WILL CAUSE BINDING OF THE COMPRESSOR ROTOR.

(a) Make sure the borescope port is open. Insert LOCALLY MANUFACTURED - TAPERED ROD DIA 0,37IN (9,4 MM) in the borescope port.
(b) Apply graphite grease (Material No.CP2101) or CP2619Never Seez-Pure Nickel, Special to the threads and pressure face of the borescope plug.
(c) Put the plug in the correct borescope port and tighten the inner plug by hand. Use the outer plug to turn the inner plug.
(d) Torque the inner plug to between 85 and 75 lbf.in (0.96 and 0.85 m.daN )

. Loosen half a turn and RETORQUE to between 20 and 15 lbf.in (0.23 and 0.17 m.daN )

more than the running torque.
(e) Compress the plug spring and tighten the outer plug by hand.

NOTE: If the inner plug is correctly installed and the threads are not damged, you can install the outer plug by hand. If the outer plug cannot be fully installed by hand , the inner plug is not correctly installed. Remove the plug and repeat steps (c), (d) and (e).

(f) TORQUE the outer plug to between 63 and 57 lbf.in (0.71 and 0.64 m.daN )

.
(g) Wirelock all 3 outer plugs together with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

5. Close-up
Subtask 72-31-00-410-056-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)
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-31-00-440-053-A ** ON A/C NOT FOR ALL

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

Subtask 72-31-00-410-059-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:42:15 UTC