________ Subtask 75-24-49-410-051
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.

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

 (3) Remove the access platform(s).

 (4) Remove the warning notice(s).

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 E E TASK 75-24-49-210-041

 Visual Inspection of the ECU Air Cooling Inlet Duct
 1. Reason for the Job
__________________
 Refer to the MPD TASK: 752000-C1
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
75-24-49-000-040 Removal of the ECU Air Cooling Tube 75-24-49-400-040 Installation of the ECU Air Cooling Tube 75-24-49-991-301 Fig. 601
 3. Job Set-up
__________ Subtask 75-24-49-941-052
 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.
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 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).
 4. Procedure
_________ (Ref. Fig. 601/TASK 75-24-49-991-301) Subtask 75-24-49-210-051
 A. Visual inspection of the ECU air Cooling Inlet Duct.
 (1) Examine the ECU air cooling inlet duct for blockage. Remove unwanted material from the duct.

 (2) A total blockage may require removal of the ECU air cooling tube to clear the blockage (Ref. TASK 75-24-49-000-040) and (Ref. TASK 75-24-49-400-040).

 5. Close-up
________ Subtask 75-24-49-869-050
 A. Make sure that the work area is clean and clear of tool(s) and other items.
 Subtask 75-24-49-942-050
 B. Remove the warning notice(s).
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 E 56-5B E E E NACELLE COMPARTMENT AND ACCESSORY COOLING - DESCRIPTION AND OPERATION

_____________________________________________________________________
 1. General
_______ R R (Ref. Fig. 001, 002) R The nacelle has three major compartments ; the engine air intake, fan and R core compartments. Each compartment is isolated from the other with R separating bulkheads and seals. The fan and core compartments surround the R engine and are exposed to engine case heat and vapors from fluid leaks. R These two compartments are cooled with forced air and have designed R ventilation porting. R Ventilation air enters the fan compartment through two inlet scoops mounted R on the inlet cowl outer barrel and flush with it. Air is ducted through the R inlet cowl aft bulkhead and is introduced into the upper and lower forward R portion of the fan compartment. Air passes down through the fan compartment R and around the accessory gearbox to cool the components and carry away any R vapor. The air exits the fan compartment through the vent port located in R the lower aft section of the right hand fan cowl door. The vents are sized R to relieve the air starter flow at high altitudes since the starter motor R exhausts directly into the fan compartment. R A pressure relief door is located in the right hand fan cowl door. It is R sized to prevent fan compartment pressure from exceeding 4 psid in the event R of pneumatic duct burst. R The core compartment is cooled with air taken from the fan discharge path R through flush inlets. The air is vented at the rear of the compartment at R the core cowl/primary nozzle interface. R Deflection of the core cowl structure provides sufficient additional relief R area in the event of a pneumatic duct rupture. R The nacelle cooling and ventilation systems provide the following functions: R - Sufficient airflow to offset the effects of engine case heat and engine R flange air leakage, thereby maintaining an acceptable compartment R temperature level. R - Cooling of temperature critical components. R - Cowling pressure load limiting in the event of pneumatic duct failures. R - Ventilation of compartment during engine shutdown. R - Ventilation of combustible fluid vapors to preclude fire.
　
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