(5)
If the forward cargo compartment fire switch on the aft pilot's control stand P8 panel is ARMED, all power is interrupted to the heating flow fan.
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A 757 MAINTENANCE MANUAL
CONTROL MODULE
Forward Cargo Heating System Schematic
Figure 2 (Sheet 1)
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A
757
MAINTENANCE MANUAL
B. Control
_______
(1) The forward cargo compartment heating system is a self controlled system requiring no pilot or mechanic action to place it into operation.
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A
757 MAINTENANCE MANUAL
FORWARD CARGO COMPARTMENT HEATING SYSTEM - ADJUSTMENT/TEST
__________________________________________________________
1. General_______
A. This procedure contains two tasks. The first task is an operational test of the heating system in the forward cargo compartment. The second task is a system test of the heating system in the forward cargo compartment.
B. The heating system in the forward cargo compartment uses a thermal switch temperature control. When the temperature in the forward cargo compartment is less than 50°F (10°), the switch closes and sends a signal to a relay. The relay controls the heater fan. When the temperature in the forward cargo compartment is 70°F (21°C), the switch disconnects the circuit to the forward cargo compartment fan relay. This stops the heat supply to the compartment.
TASK 21-43-00-715-002
2. Operational Test - Forward Cargo Compartment Heating System____________________________________________________________
A. General
(1)
This test makes sure the fan and temperature control switch operate correctly.
B.
Equipment
(1)
Cooling source - ice pack - commercially
available
(2)
Thermometer - range 0 to 120°F (0 to 49°C) -commercially available
C.
References
(1)
AMM 24-22-00/201, Electrical Power Control
D.
Access
(1)
Location Zones
121/122 Forward Cargo Compartment
211 212 Control Cabin - Section 41
E.
Procedure
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-004
(2)
Make sure these circuit breakers on the pilot's overhead circuit breaker panel, P11, are closed:
(a)
11N1, INSTRUMENT AND PANEL AISLE STAND
(b)
11N17, CARGO HEATER FAN FWD
(c)
11S15, AIR/GND SYS 1
(d)
11S19, AIR/GND SYS 2
S 865-003
S 865-006
(3)
Make sure this circuit breaker on the miscellaneous electrical equipment panel, P70, is closed:
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