757
MAINTENANCE MANUAL

 S 215-047
 (13)
 Make sure warm air comes out of the eleven vent nozzles.

 S 865-048

 (14)
 Put the EICAS COMPUTER switch on the pilot's display to the LEFT position.

 S 865-049

 (15)
 Open this circuit breaker on the P37 panel:

 (a)  
37C2, AFT CARGO FAN

 S 215-050
 (16)
 Make sure the fan stops and the heater does not have electrical power.

 S 215-052

 (17)
 Push the STATUS key on the EICAS pilot's display.

 (a)  
Make sure the EICAS status message, AFT CARGO FAN, shows on the bottom EICAS display.

 S 215-053
 (18)
 Push the ECS/MSG key on the EICAS maintenance panel.

 (a)  
Make sure the EICAS maintenance message, AFT CARGO FAN, shows on the bottom EICAS display.

 S 865-054
 (19)
 Put the EICAS COMPUTER switch on the EICAS pilot's display to RIGHT.

 S 865-055

 (20)
 Push the AUTO READ button on the EICAS maintenance panel.

 S 865-103

 (21)
 Push the ERASE button on the EICAS maintenance panel.

 (a)  
Make sure the EICAS maintenance message, AFT CARGO FAN, stays on the bottom EICAS display .

 S 865-056
 (22)
 Close this circuit breaker on the P37 panel:

 (a)  
37C2, AFT CARGO FAN

 (23)
 Make sure the fan starts and the heater has electrical power.

 (24)
 Push the AUTO READ button on the EICAS maintenance panel.

 S 215-057
 S 865-059
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-44-00
 ALL  ú ú 01 Page 507 ú Mar 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 865-104
 (25)
 Push the ERASE button on the EICAS maintenance panel.

 (a)  
Make sure the EICAS maintenance message, AFT CARGO FAN, goes off.

 S 215-060
 (26)
 Push the AFT CARGO FIRE switch-light on the P8 stand to the ARMED position (ARMED light on).

 (a)  
Make sure the fan stops and the heater does not have electrical power.

 S 215-062
 (27)
 Push the AFT CARGO FIRE switch-light on the P8 stand to the usual position (ARMED light off).

 (a)  
Make sure the fan starts and the heater has electrical power.

 S 805-064
 (28)
 Measure the temperature of the air that comes from a nozzle.

 S 885-065

 (29)
 Increase the temperature of the temperature control switch to 70°F (21°C) maximum.

 S 215-066

 (30)
 Make sure the temperature that comes from the nozzle decreases and the fan stops after approximately 20 seconds.

 S 885-068

 (31)
 Remove the heat source.

 (32)
 Close the aft cargo compartment door, 822.

 (33)
 Remove electrical power, if it is not necessary.

 S 415-069
 S 865-070
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-44-00
 ALL  ú ú 01 Page 508 ú Mar 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 715-115
 (34) Do the task: Aft Cargo Temperature Control Switch Check.
 TASK 21-44-00-715-112
 5.  Aft Cargo Temperature Control Switch Check (Fig 501)__________________________________________
 A. General
 (1)  
When the cargo compartment temperature is less than 50°F (10°C), the temperature control switch closes. This sends a signal to the relays that control the fan and heater. The fan removes cold air from the cargo compartment and pushes it through a series of eleven nozzles. When the cargo compartment temperature is 70°F (21°C), the switch opens the circuit to the cargo compartment heater relay. After a 20-second time delay, the fan relay stops the heat supply to the compartment.
　
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