General Visual Inspection of the Inner Barrel Heatshield, Fire Protective Coating and Fire Seals (C-Ducts Open) [CFMB]

TASK 78-32-11-220-040-B
General Visual Inspection of the Inner Barrel Heatshield, Fire Protective Coating and Fire Seals (C-Ducts Open)

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400

1. Reason for the Job
Refer to the MPD TASK: 783000-C8
GENERAL VISUAL INSPECTION OF INNER BARREL HEATSHIELD, FIRE PROTECTIVE COATING AND FIRE SEALS (C DUCTS OPEN)
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	1	BRUSH - NON METALLIC
No specific	1	FLASHLIGHT
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2267)	RTV 106
(Material No.CP2463)	RTV 560

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
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
NSRM 543000
CMM 783236
Thrust Reverser Inner Barrel Heatshield and Fire Protective Coating
Thrust Reverser Fire Seals

3. Job Set-up
Subtask 78-32-11-941-054-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 78-32-11-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-32-11-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-11-010-055-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 78-32-11-220-050-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the Inner Barrel Heatshield and Fire Protective Coating as follows:

NOTE: If required, use the FLASHLIGHT for hard to see places.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Inspect the inner barrel heatshields for:
A.Crack or hole	None permitted	If there are cracks or holes, repair or replace before next flight. Monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
B.Gouge, nick and scratch	0.008 in. (0.20 mm) maximum depth over 8 in. (203.2 mm) length.	Record location and monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
C.Missing or uncrimped rivets	Maximum of ten percent missing or uncrimped per row of rivets.	Missing or uncrimped rivets must be separated by four good rivets. Missing end rivets not permitted. Monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
D.Bulges, gaps
(1)At exit heatshield trailing edge	0.157 in. (4.0 mm) maximum bulges or gaps.	Allowable if there is no crack or hole. If bulges or gaps are more than 0.157 in. (4.0 mm) monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest), or repair NSRM 543000, Rep.No.12.
(2)Heatshield other than trailing edge	Permitted if there is no crack or hole.	Permitted if there is no crack or hole.
E.Heat coloration	Permitted if there is no other damage	Record location and inspect at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
2.Inspect thermal blanket outer foil:
A.Any/all damage	No damage permitted	If the damage is less than 3.0 in. (76.2 mm) in diameter, (and the filler is not missing or wet), do NSRM 543000, temporary rep. No. 19. Do a permanent repair not later than 750 flight hours / 750 flight cycles (whichever the earliest) after the temporary repair. For permanent repair do CMM 783236 rep. No. 58.
B.Security of attachment	No defect allowed	Replace damaged RTV 106 (Material No.CP2267) and broken or loose safety wire.
3.Examine intumescent fireproof coating for:
A.Abrasion	None permitted	If there is an abrasion, repair before next flight per CMM 783236 Rep. No. 63. Record the location of repairs and monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
B.Scratches	0.06 in. (1.52 mm) maximum depth.	Record location and monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest)
C.Holes, peeling	None permitted	If there is a hole or peeling, repair before next flight per CMM 783236 Rep. No. 63. If the intumescent coating pink color appears, recover it with a RTV 106 (Material No.CP2267) with the BRUSH - NON METALLIC and over lap with a RTV 560 (Material No.CP2463) . Record location of repairs and monitor at 750 flight hours / 750 flight cycles / 4 calendar months (whichever the earliest) NOTE: (For intumescent coating only). 15 repairs are allowed for one thrust reverser half, and 3 repairs for an area of 140 in.2 (90322 mm2).
4.Inspect thrust reverser fire seals for:
A.Damage	None allowed	If damage is found, replace the fire seal CMM 783236.
B.Cut	None allowed	If a cut is found, replace the fire seal CMM 783236.
C.Missing seal	None allowed	Replace the missing fire seal CMM 783236.
D.Missing fasteners	None allowed	Replace the missing fasteners CMM 783236.
E.Misalignment	None allowed	Align or replace the fire seal CMM 783236.

5. Close-up
Subtask 78-32-11-410-055-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 78-32-11-440-052-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-11-410-056-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:25:54 UTC