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ú Dec 20/96
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A
757 FAULT ISOLATION/MAINT MANUAL
FOOT ELECTRIC SHOULDER AIR
SURFACE HEATERSUPPLY HEATER
SEE
SHT 2 SEE
SHT 2
Heating - Component Location
Figure 102 (Sheet 1)
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A
757
FAULT ISOLATION/MAINT MANUAL
FWD
FWD
SHOULDER
AIR SUPPLY
HEATER
FOOT ELECTRIC SURFACE HEATER
A SHOULDER AIR SUPPLY HEATER
B
GRILL
AFT CARGO HEATING INTAKE (REF) FAN
DUCT
(REF)
TEMPERATURE CONTROL SWITCH
WIRE
AFT CARGO TEMPERATURE FILTER FWD
CONTROL SWITCH
C
AFT CARGO FLOW FAN
D
Heating - Component Location (Details from Sht 1)
Figure 102 (Sheet 2)
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757
FAULT ISOLATION/MAINT MANUAL
HEATER
AFT CARGO HEATER
E
GRILL
FORWARD CARGO (REF)
HEATING INTAKE DUCT (REF)
HEATING
FLOW FAN
WIRE FILTER TEMPERATURE
THERMAL
SWITCH
FWD INBD FORWARD CARGO TEMPERATURE THERMAL SWITCH
F
FORWARD CARGO HEATING FLOW FAN G
Heating - Component Location (Details from Sht 1) Figure 102 (Sheet 3)
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757 MAINTENANCE MANUAL
FORWARD CARGO COMPARTMENT HEATING SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________________________
1. General_______
A. The forward cargo heating system recirculates cargo compartment air through a fan. Heat is picked up from the fan before the air is recirculated back into the cargo compartment. A thermal switch controls fan operation.
2. Component Details (Fig. 1)_________________
A. Forward Cargo Heating Flow Fan
______________________________
(1)
Description
(a)
The axial flow fan is a single stage vaneaxial fan integrating the motor into the fan to provide simplicity of design and construction and to optimize unit life and reliability.
(b)
The forward cargo heating flow fan is located behind the FWD cargo compartment aft endliner in the mix manifold bay.
(c)
The fan consists of a single cast aluminum alloy housing containing a single cast unit impeller and an end bell (both of aluminum alloy), two sealed ball bearings, and the stator assembly and rotor.
(d)
The fan housing contains an inner housing which encases the stator assembly and rotor. Vanes are integrally cast between the outer and inner housings. The vanes optimize low noise levels, provide structural support, and transfer heat from the motor to the airflow and outer housing for motor cooling.
(e)
The drive motor is a three-phase, squirrel-cage type induction machine. Three miniature indirect-acting thermostats, which serve as thermal protective devices, are connected in series, one located over a coil in each phase.
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