Inspection/Check of the High Pressure Turbine Active Clearance Control Valve (HPTACC) [CFMB]

TASK 75-21-10-200-002-A
Inspection/Check of the High Pressure Turbine Active Clearance Control Valve (HPTACC)

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, 451AL, 452AR, 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 75-21-10-000-002-A	Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
TASK 75-21-10-400-002-A	Installation of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
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
High Pressure Turbine Active Clearance Control Valve Inspection

3. Job Set-up
Subtask 75-21-10-941-052-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 75-21-10-010-055-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls 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 75-21-10-040-054-A ** ON A/C NOT FOR ALL

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

Subtask 75-21-10-010-056-A ** ON A/C NOT FOR ALL

D. Open 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 75-21-10-210-052-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the HPT active clearance control (HPTACC) valve as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Valve housing for:
cracks	Not serviceable.	Replace the valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002).
deformation	Not serviceable.	Replace the valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002).
nicks or scratches	Any amount
2.Flanged joints for:
loose bolts or nuts	Not serviceable.	TORQUE the bolts (Ref. AMM TASK 75-21-10-400-002).
cracks	Not serviceable.	Replace the valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002)
deformed or bent	Not serviceable.	Replace the valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002). PRE CFM SB 75-0012
3.Ceramic Insulators for PRE SB 75-0026 and earlier
Looseness	Not serviceable NOTE: POST SB 75-0026 and later do not have ceramic insulators.	Remove the valve (Ref. AMM TASK 75-21-10-400-002) END OF PRE CFM SB 75-0012 POST CFM SB 75-0012
4.Ceramic Insulators for:
- Not applicable

END OF CFM SB 75-0012

Subtask 75-21-10-230-051-A ** ON A/C NOT FOR ALL

B. If a crack is suspected after visual inspection, do a fluorescent penetrant inspection to make sure of actual or suspected cracks in the valve housing or a flanged joint (Ref. AMM TASK 70-51-00-230-002).

5. Close-up
Subtask 75-21-10-410-054-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 doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM2] (ENGINE-2)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 75-21-10-440-053-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).
(1) Remove the WARNING NOTICE(S).

Subtask 75-21-10-410-055-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (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 03:10:05 UTC