(10)
 Set the ISOLATION VALVE switch on the P5 panel to ON.

 S 865-443

 (11)
 Start and operate the APU (AMM 49-11-00/201).

 S 865-445

 (12)
 Set the APU BLEED AIR switch to ON.

 S 215-240

 (13)
 Make sure the L (R) DUCT PRESS gage on the P5 panel shows the pressure increases to 35 +/- 5 psi.

 S 045-241
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN MOVE QUICKLY AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPEMENT.
 (14) Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the control surfaces.
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757 MAINTENANCE MANUAL
 S 865-447
 WARNING:_______OBEY THE PROCEDURE THAT PUTS THE AIRPLANE IN THE AIR MODE. IF YOU DO THE PROCEDURE INCORRECTLY, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (15)
 Put the air/ground relay system in the air mode (AMM 32-09-02/201).

 S 865-449

 (16)
 Make sure the TRIM AIR switch on the P5 panel is OFF.

 F.
Heat Exchanger Test

 S 715-243
 (1)  
Move the L (R) pack selector to STBY C.

 (a)  
Look at the L (R) TEMP VALVE display on the ECS maintenance page.

 (b)  
Make sure the TEMP VALVE display show that the temperature control valve is closed (0.00-0.05).

 S 025-244
 CAUTION: DO NOT TOUCH THE ENGINE SPEED CARD BEFORE YOU DO THE PROCEDURE
_______ FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE ENGINE SPEED CARD.
 (2)  
Before you touch the engine speed card, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-01/201).

 (3)  
Remove the left (right) engine speed card (AMM 77-12-03/401).

 S 715-246

 (4)  
Look at the position indicator on the left (right) flow control valve.

 (a)  
Make sure the flow control valve moves to the normal flow position.

 S 025-245
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MAINTENANCE MANUAL

194ER
193HL
COOLING
PACKS
SEE A PRIMARY AND SECONDARY HEAT EXCHANGERS
SEE B
FWD
LEFT COOLING PACK (RIGHT COOLING PACK IS EQUIVALENT)
A
PRIMARY HEAT EXCHANGER
INLET TO PRIMARY SECONDARYHEAT EXCHANGER HEAT
EXCHANGER INLET TO PRIMARY HEAT EXCHANGER
AIR CYCLE
MACHINE

COMPRESSOR
OUTLET

OUTLET FROM PRIMARY
HEAT EXCHANGER
OUTLET FROM SECONDARY HEAT EXCHANGER
FWD
PRIMARY AND SECONDARY HEAT EXCHANGERS
B

Primary and Secondary Heat Exchanger Test
Figure 504

F03415
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757
MAINTENANCE MANUAL

 S 975-247
 (5)  AIRPLANES WITH THE PRIMARY HEAT EXCHANGER TEMPERATURE DISPLAY; Make a record of the PRIM HX IN display on the ECS maintenance page as T1.
 S 975-506
 (6)  AIRPLANES WITHOUT THE PRIMARY HEAT EXCHANGER TEMPERATURE DISPLAY; Measure the surface temperature of the inlet duct for the primary heat exchanger. (a) Make a record of the primary heat exchanger inlet temperature as T1.
　
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