Inspection/Check of the Combustion Case Assembly [CFMB]

TASK 72-41-00-200-002-A
Inspection/Check of the Combustion Case Assembly

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-51-00-230-002-A	Fluorescent-Penetrant Inspection-Portable-Water Washable
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 72-41-00-300-002-A	Repairs of the Combustion Case Assembly
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
Combustion Case Assembly

3. Job Set-up
Subtask 72-41-00-941-052-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 72-41-00-010-054-A ** ON A/C NOT FOR ALL

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

Subtask 72-41-00-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 72-41-00-010-056-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser cowl 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 72-41-00-230-052-A ** ON A/C NOT FOR ALL

A. Do a fluorecent penetrant inspection.
(1) When you do the visual inspection, if you find a crack or suspected crack in the combustion case assembly, you have to do the FPI to confirm the crack (Ref. AMM TASK 70-51-00-230-002).

Subtask 72-41-00-210-051-A ** ON A/C NOT FOR ALL

B. Do a visual inspection.
(1) Do the visual inspection that follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Combustion casing body for :
Cracks	Not serviceable
Nicks, scores and scratches	Any number 0.03 in. (0.76 mm) deep after removal of high metal
Dents	Any number 0.10 in. (2.54 mm) deep after removal of high metal
Buckling or distortion because of overtemperature	Not serviceable
Hot spots (discoloration)	Any number, if metal not crazed. No cracks are permitted.
2.Combustion casing forward flanges for :
Bolt hole cracks that extend radially outward	One crack per hole, 2 cracks per frame
Bolt hole cracks that extend radially inward	Not serviceable	See limit extensions (Ref. AMM TASK 72-00-00-200-025)
3.Combustion case midflange for :
Broken bolts	One broken bolt with a minimum of 5 bolts that are not broken on both sides of the broken bolt. No more than 2 broken bolts in any group of 20.	See limit extensions (Ref. AMM TASK 72-00-00-200-025)
4.Combustion casing aft flange for :
Bolt hole cracks that extend radially outward	One crack per hole, 2 cracks per frame
Bolt hole cracks that extend radially inward	Not serviceable	See limit extensions (Ref. AMM TASK 72-00-00-200-025)
5.Fuel nozzle pads for :
Thread damage	Minimum of 4 undamaged threads must be present after chasing threads
Nicks, scores, pits and deposits	Any number on sealing surface 0.03 in. (0.76 mm) deep not extending across more than 50 percent of sealing surface after removal of high metal	Remove high metal and deposits (Ref. AMM TASK 72-41-00-300-002)
6.Igniter and borescope bosses for :
Thread damage	Minimum of 3 undamaged threads must be present after chasing threads
7.HPT shroud cooling and CDP bleed pads for :
Nicks, scores, pits and scratches	Any number, any length 0.03 in. (0.76 mm) in depth provided discrepancy does not extend over 75 percent of sealing surface	Remove high metal (Ref. AMM TASK 72-41-00-300-002).
Cracks extending from bolt holes	One crack per hole no longer than 0.06 in. (1.52 mm)	See limit extensions (Ref. AMM TASK 72-00-00-200-025)

5. Close-up
Subtask 72-41-00-410-054-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).
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-41-00-440-052-A ** ON A/C NOT FOR ALL

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

Subtask 72-41-00-410-056-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(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 02:42:34 UTC