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 3. Job Set-up
__________
 Subtask 75-23-10-941-053
 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 75-23-10-010-057
 B. Get Access
 (1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (2) Put the access platform in position.

 Subtask 75-23-10-040-055
 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
 Subtask 75-23-10-010-059
 D. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

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_________
 (Ref. Fig. 601/TASK 75-23-10-991-304)
 Subtask 75-23-10-210-052
 A. Do a visual inspection of the rotor active clearance start bleed (RACSB) valve as follows:
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Valve unit for :
 A. Cracks  Not serviceable Replace the valve (Ref. TASK 75-23-10-000-002) and (Ref. TASK 75-23-10-400-002).
 B. Deformation  Not serviceable Replace the valve (Ref. TASK 75-23-10-000-002) and (Ref. TASK 75-23-10-400-002).
 C. Nicks or scratches  not serviceable Replace the valve (Ref. TASK 75-23-10-000-002) and (Ref. TASK 75-23-10-400-002)
 D. Loose bolts or Not serviceable  TORQUE the bolts
 nuts  (Ref. TASK 75-23-10-400-002)
 2. Flange joints for : Not serviceable Replace the valve
 A. Cracks  (Ref. TASK 75-23-10-000-002) and (Ref. TASK 75-23-10-400-002).
 B. Deformed or bends  Not serviceable Replace the valve (Ref. TASK 75-23-10-000-002) and (Ref. TASK 75-23-10-400-002).
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 RACSB Valve Inspection
 Figure 601/TASK 75-23-10-991-304

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________ Subtask 75-23-10-410-056
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.

 (2) Close the thrust reverser doors: (Ref. TASK 78-36-00-410-040). FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR

 (3) Remove the access platform(s). Subtask 75-23-10-440-053

 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041). Subtask 75-23-10-410-057

 C. Close Access
 (1) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (2) Remove the warning notice(s).

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 ECU COOLING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________
 1. General

_______ (Ref. Fig. 001) The electronic control unit (ECU) is air cooled. This air flow maintains ECU internal temperatures within max limits. An air scoop is located on the inlet outer barrel. It is flush with the barrel and supplies air through a duct to the ECU. The cooling air is exhausted from the ECU into the fan compartment.

 2. Description

___________ The air entering the ECU flows across the cooling fins of the heat sink. For normal operation, ambient temperature less than 100 deg.F (38 deg.C) or mach number greater than 0.4, this cooling system is adequate. Then the cooling requirement is 50 g/s (1.765 oz/s), which is taken by a scoop on the outside surface of the air intake cowl.
　
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