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72-52-00-290-004 Borescope Inspection of the High Pressure Turbine Rotor Blade (from the front) 72-52-00-290-004 Borescope Inspection of the High Pressure Turbine
 Rotor Blade (from the front)
 73-21-40-210-002 Visual Inspection of the T12 Temperature Sensor
 78-30-00-081-041 Make the Thrust Reverser Serviceable after

 Maintenance
 78-30-00-481-041 Make the Thrust Reverser Unserviceable for

 Maintenance
 78-36-00-010-040 Opening of the Thrust Reverser Doors
 78-36-00-410-040 Closing of the Thrust Reverser Doors

R  79-21-10-920-002 Remove and Discard Supply Filter TSM 77 PB 101
 3. Job Set-up
__________
 Subtask 72-00-00-941-133
 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 72-00-00-010-174
 B. Open the fan cowl doors (Ref. TASK 71-13-00-010-040):
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

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 Subtask 72-00-00-040-091

 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
 Subtask 72-00-00-010-175
 D. Open the thrust reverser doors (Ref. TASK 78-36-00-010-040):
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

 4. Procedure
_________
 Subtask 72-00-00-280-077
R A. Volcanic Ash, Dust, or Sand Inspection
R (1) The following requirements are subsequent to incidents of engines R flown or operated in volcanic ash, dust, or sand.
 (a) Visually check engine inlet and exhaust areas for evidence of damage or excessive erosion.
R (b) Borescope inspect High Pressure Compressor and High Pressure
R Turbine for evidence of the following (Ref. TASK 72-31-00-290-R 002), (Ref. TASK 72-42-00-290-003), (Ref. TASK 72-51-00-290-004),
R (Ref. TASK 72-52-00-290-001) or (Ref. TASK 72-52-00-290-001),
R (Ref. TASK 72-52-00-290-004) or (Ref. TASK 72-52-00-290-004):

R NOTE : Inspect all stages of the HPC. The aft stages of the HPC

____ R will be most effected by erosion.
R NOTE : Inspect the HPT nozzle vanes and the HPT blades for
____ R erosion and accumulation of solidified material. R Sufficient amounts of material accumulation on the HPT R nozzle vanes can cause a reduced engine stall margin.
 1 Excessive erosion.
_
 2 Foreign object damage (FOD).
_
R 3_ Build-up of ash, dust, or sand deposits that have solidifiedR on the HPT nozzle vanes and HPT blades.
R a_ If material has solidified on the HPT vanes or blades,R contact CFM.
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 (c) Oil system.

 1 Replace scavenge oil filter (Ref. TASK 79-21-10-920-002).
_
 2 Drain oil (Ref. TASK 12-13-79-610-003) and (Ref. TASK 12-13-
_
 79-610-004).

R 3_ Replace oil (Ref. TASK 12-13-79-610-002) or (Ref. TASK 12-13-R 79-610-002).
 (d) Monitor engine operation to determine if a shift in performance parameters has occurred. If parameters are abnormal, (Ref. TSM 77 PB 101).

 (e) Check for proper cooling of ignition leads.

 (f) Check condition of T12 temperature sensor (Ref. TASK 73-21-40-210-002).

 (g) Flush accessory and transfer gearboxes (Ref. TASK 12-13-79-610-005).

 (h) Check for fouling of LPT case air cooling Scoop and precooler Scoop on Thrust Reverser (T/R).

 (2) The following requirements are subsequent to incidents of engines NOT flown or operated in volcanic ash, dust, or sand, but have been exposed to volcanic ash, dust, or sand on the ground.
 NOTE : Do not water wash an engine that has been exposed to volcanic
____ ash, dust, or sand. Particles may accumulate in the HPT nozzle vanes and HPT blade cooling paths. Material may accumulate in the HPC rotor spools and cause rotor imbalance.
　
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