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 4.  System Test - Aft Cargo Compartment Heating System__________________________________________________
 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.

 B.
Equipment

 (1)  
Thermometer - range 0 to 120°F (0 to 49°C) -commercially available.

 (2)  
Heating Source - hand-held blow dryer -commercially available.

 (3)  
Cooling source - ice pack - commercially
 available.

 C.
References

 (1)  
06-46-00/201, Entry, Service and Cargo Doors, Access Doors and Panels

 (2)  
24-22-00/201, Electric Power-Control

 D.
Access

 (1)  
Location Zone
 822 Left Cargo Compartment Door

 E.
Test - Aft Cargo Compartment Heating System (Fig. 501)

 S 865-032
 (1)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:

 (a)  
11N1, INSTRUMENT AND PANEL AISLE STAND

 (b)  
11N18, CARGO HEAT AFT

 (c)  
11S15, AIR/GND SYS 1

 (d)  
11S19, AIR/GND SYS 2

 (e)  
11N22, CARGO HEAT FAN AFT

 (f)  
EICAS circuit breakers (5 locations)

 S 865-033
 (2)  
Make sure this circuit breaker on the right miscellaneous electrical equipment panel, P37, is closed:

 (a)  
37C2, AFT CARGO FAN

 (3)  
Supply electrical power (Ref 24-22-00).

 S 865-035
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A
757
MAINTENANCE MANUAL

 (4)  S 865-034Push the AFT CARGO FIRE switch-light on the aft pilot's control stand, P8, to the ARMED position (ARMED light on).
 (5)  S 015-037Open the aft cargo compartment door 822 (Ref 06-46-00) and find the aft cargo heater, fan, and temperature control switch.
 (6)  S 885-039Measure the temperature near the aft cargo temperature control switch.
 (7)  S 885-040If the temperature is less than 70°F (21°C), increase the temperature of the temperature control switch to 70°F (+/- 1°F) or above .
 S 215-041

 CAUTION: OPEN THE AFT CARGO HTR (70C8) C/B IN THE P70 PANEL IMMEDIATELY
_______ IF THE HEATER IS ENERGIZED AND THE FAN DOES NOT OPERATE. THE TEMPERATURE OF THE HEATER SHELL CAN BECOME HOT BEFORE THE SURFACE TEMPERATURE PROTECTION STARTS. THE DUCT AIR TEMPERATURE CAN BECOME 180°F (82.2°C) AND CAUSE DAMAGE.
 (8)  
Make sure the fan and heater do not operate.

 S 885-042

 (9)  
Decrease the temperature of the temperature control switch to maintain a temperature of 50°F (+/- 1°F) or lower.

 S 865-043

 (10)
 Push the AFT CARGO FIRE switch-light on the P8 stand to the usual position (ARMED light off).

 S 215-110
 WARNING:_______DO NOT PUT YOUR HAND CLOSE TO THE FAN. FEEL FOR AIR MOVEMENT AT THE NOZZLES. IF YOUR HAND TOUCHES THE FAN BLADES, IT WILL CAUSE INJURY.
 (11) Make sure the fan starts and moves in the correct direction.
 NOTE: Air will go into the inlet grille.
____
 S 215-046
 (12)
 Make sure all the joints and ducting to and from the fan are tight.

 (a)  
To make sure you cannot feel air, hold your hand 2 inches from joints and ducting.

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