Replace the Nut Plates - Fire Containment Ring Assembly - Compressor Intermediate Case [PW11]

TASK 72-34-01-960-802-A
Replace the Nut Plates - Fire Containment Ring Assembly - Compressor Intermediate Case

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

CAUTION: THIS AIRCRAFT MAINTENANCE MANUAL REPAIR LETS YOU REPLACE ONLY THE ORIGINAL EQUIPMENT MANUFACTURER'S NUT PLATES. IF THERE IS DAMAGE TO THE HOLE(S) AND AN OVERSIZE NUT PLATE IS NECESSARY, THEN YOU MUST NOT DO THE REPAIR ON-WING. YOU MUST REMOVE AND REPAIR THE PART (REFER TO THE APPLICABLE CLEANING, INSPECTION & REPAIR MANUAL).

CAUTION: USE SUFFICIENT PROTECTIVE COVERS. IF YOU DO NOT OBEY THIS INSTRUCTION, DRILLED-OUT METAL CHIPS WILL GO INTO THE OPEN AREAS, CAVITIES, HOLES AND PORTS. THEY CAN GO INTO THE FLOWPATH AND PREVENT CORRECT OPERATION OF THE ENGINE.

CAUTION: MAKE SURE THAT THE 2.5 BLEED VALVE IS CLOSED BEFORE YOU DO THE REPAIR.

CAUTION: USE A DRILL STOP WHEN YOU DRILL OUT THE RIVETS. IF YOU DO NOT OBEY THIS INSTRUCTION, THE DRILL CAN EXTEND INTO THE PARENT MATERIAL AND CAUSE DAMAGE TO THE FIREWALL.

1. Reason for the Job
Use this procedure to replace the damaged nut plates and rivets on a fan panel (fan exit liner segments) and firewall (fire containment ring assembly - Compressor Intermediate Case) interface.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	BOLT - WORK (0.250 - 28 IN.)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-24-00-910-802-A	PWA 357 - Removal of Rivets
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 72-21-08-400-801-A	Installation of the Fan Exit Liner Segments
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case

3. Job Set-up
Subtask 72-34-01-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 72-34-01-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

Subtask 72-34-01-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-34-01-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure
Subtask 72-34-01-960-050-A ** ON A/C NOT FOR ALL

A. Replacement of the nut plate:

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Find the fire containment ring (1) attached to the compressor intermediate case. See Sheet 1 of the figure

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

(2) Remove the fasteners that attach the fan exit liner segment to the fire containment ring (1) and remove the fan exit liner segment to gain access for drilling out the rivets (12) (Ref. AMM TASK 72-21-08-000-801).

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

(3) Remove the damaged nut plates (11) at location N as follows:

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

See Table 1.
(a) Remove the rivets (12) that attach the nut plates (11) to the front flange of the fire containment ring (1) (Ref. AMM TASK 70-24-00-910-802).
(b) Remove and discard the nut plates (11).
(4) Clean the areas where the nut plates (11) were removed and the adjacent areas by SPOP 208 (Ref. AMM TASK 70-27-00-910-804).
(5) Do a visual inspection of the fire containment ring (1) surfaces where the nut plates (11) were removed. Refer to Section 70-31-00 in the standard practices manual, PN 585005.
(6) Remove only sharp edges and raised material at the hole to prepare for the dimensional inspection. Refer to Repair-09, Section 70-00-00 in the standard practices manual, PN 585005.
(7) Do a dimensional Inspection of the rivet holes. Refer to 70-43-00 in the standard practices manual, PN 585005 for rivet hole visual and dimensional limits.
(8) Apply epoxy primer coating for titanium by SPOP 148 in local area A where the protective coating has been removed from the fire containment ring (1). Refer to PW SPM-0000-70-41-03-15A-610A-D.

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

(9) Put the new nut plate(s) (11) in the correct location on the side of the front flange of the fire containment ring (1) and align the rivet holes. Attach each new nut plate (11) in position with a BOLT - WORK (0.250 - 28 IN.).

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

(10) Install the rivets (12) by PWA 357-21. Refer to PW SPM-0000-70-43-00-03A-624-A-D.

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

(11) Examine the rivets (12) for cracks, clearance, and correct installation by PWA 357 and

Replace The Nut Plates - Fire Containment Ring Assembly Compressor Intermediate Case ** ON A/C NOT FOR ALL

Refer to (Ref. AMM TASK 70-24-00-910-802) in the standard practices manual, PN 585005. If the rivet (12) is not in the limits after installation, remove and replace the rivet (12).

NOTE: Each rivet head surface must be below surface Z after rivet installation.

(12) Install the fan exit liner segment and the parts that attach the fan exit liner segment to the fire containment ring (1) (Ref. AMM TASK 72-21-08-400-801).
(13) Examine the assembly for foreign objects, damage and correct assembly.

Table 1: Basic Angular Position for Location N (Clockwise From Top Dead Center)

Nut Plate Angular Position
13.11 degrees
15.11 degrees
42.89 degrees
57.00 degrees
71.11 degrees
102.89 degrees
117.00 degrees
131.11 degrees
162.89 degrees
177.00 degrees
191.11 degrees
222.89 degrees
237.00 degrees
251.11 degrees
280.89 degrees
297.00 degrees
313.11 degrees
344.89 degrees
346.89 degrees
357.00 degrees

5. Close-up
Subtask 72-34-01-410-050-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 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 72-34-01-440-050-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 72-34-01-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:49:16 UTC