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3. Job Set-up
__________
Subtask 75-21-10-941-052
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice 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 to tell persons not to energize the FADEC 1(2).
Subtask 75-21-10-010-055
B. Get Access
(1) Open the fan cowls doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR.
(2) Put the access platform in position.
Subtask 75-21-10-040-054
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
Subtask 75-21-10-010-056
D. Open Thrust reverser doors:(Ref. TASK 78-36-00-010-040)
FOR 1000EM1
451AL, 452AR
FOR 1000EM2
461AL, 462AR.
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4. Procedure
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(Ref. Fig. 601/TASK 75-21-10-991-300)
Subtask 75-21-10-210-052
A. Do a visual inspection of the HPT active clearance control (HPTACC) valve as follows:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Valve housing for:
- cracks Not serviceable. Replace the valve (Ref. TASK 75-21-10-000-002) and (Ref. TASK 75-21-10-400-002).
- deformation Not serviceable. Replace the valve (Ref. TASK 75-21-10-000-002) and (Ref. 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. TASK 75-21-10-400-002).
- cracks Not serviceable. Replace the valve (Ref. TASK 75-21-10-000-002) and (Ref. TASK 75-21-10-400-002)
- deformed or bent Not serviceable. Replace the valve (Ref. TASK 75-21-10-000-002) and (Ref. TASK 75-21-10-400-002).
R R PRE CFM SB 75-0012 R
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High Pressure Turbine Active Clearance Control Valve Inspection
Figure 601/TASK 75-21-10-991-300- 12 (SHEET 1)
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High Pressure Turbine Active Clearance Control Valve Inspection
Figure 601/TASK 75-21-10-991-300- 22 (SHEET 2)
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R R 3. Ceramic Insulators for:
R R - Looseness Not serviceable
R R R END OF PRE CFM SB 75-0012
R R POST CFM SB 75-0012
R R R R R R 4. Ceramic Insulators for: - Not applicable END OF CFM SB 75-0012
Subtask 75-21-10-230-051
Remove the valve (Ref. TASK 75-21-10-400-002)
B. Do a fluorescent penetrant inspection to make sure of actual or suspected cracks in the valve housing or a flanged joint.
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