(3)
Tighten the two screws that tighten the clamp around the indicator to 7 +1/-2 in-lbs.
S 424-007
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A 737-300/400/500MAINTENANCE MANUAL
CABIN ALTITUDE/DIFFERENTIALPRESSURE INDICATOR
FORWARD OVERHEAD PANEL (P5)
(LOWER RIGHT PART)
Cabin Altitude/Differential Pressure Indicator Installation
Figure 401
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737-300/400/500MAINTENANCE MANUAL
CONTROL AND PASSENGER CABIN HEATING - DESCRIPTION AND OPERATION
_______________________________________________________________
General
_______
A. Heating includes that portion of the air conditioning system which supplies heated air to the passenger cabin and cargo compartments. Heating is accomplished by use of conditioned airflow and distribution ducting.
B. Cabin heating is accomplished by conditioned air distribution. The overhead distribution duct provides heat to the cabin (Ref 21-41-00).
C. Cargo compartment heating is accomplished by exhausting passenger cabin
air around the compartment walls (Ref 21-43-00).Control Cabin Heating
_____________________
A. Heating or cooling is determined by the temperature control system, (21-61-00), which either lowers or raises the temperature of the cabin by mixing air from the air cycle system with not air bypassing the air cycle system (Ref 21-50-00).
B. Maintaining a desirable temperature in the control cabin is accomplished through the control cabin air distribution system. Conditioned air enters the control cabin from several outlets located to give proper air circulation throughout the cabin (Ref 21-22-00).
Passenger Cabin Heating
_______________________
A. Maintaining a relatively consistent temperature throughout the passenger cabin is accomplished through the passenger cabin air distribution system. Conditioned air enters the passenger cabin from a nozzle in the overhead distribution duct and sidewall outlets which gives proper air circulation throughout the cabin (Ref 21-23-00).
B. Temperature in the passenger cabin is maintained by the temperature control system (Ref 21-61-00) raising or lowering the temperature from the air conditioning packs (Ref 21-50-00).
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737-300/400/500MAINTENANCE MANUAL
CARGO COMPARTMENT HEATING - DESCRIPTION AND OPERATION
_____________________________________________________
General
_______
A. Cargo compartment heating is accomplished by exhausting passenger cabin air around the compartment walls.
B. Air from the passenger cabin, after picking up heat from the passenger cabin, is exhausted through foot level grilles in the passenger cabin sidewall. This air then flows around the walls to keep the cargo compartment from becoming cold as a result of outside air temperature. Air is induced through the walls of the aft cargo compartment by exhausting the air through the cabin pressurization outflow valve located to the right of the airplane centerline, at the underside of the airplane, approximately below the aft right service door.
Forward Cargo Compartment Heat Distribution
___________________________________________
A. Control cabin air is drawn through ducts located in the P6 circuit breaker panel, behind the instrument panels and is utilized for equipment cooling. This duct, on the right side of the airplane connects into a system of ducts and manifolds that lead to an inlet plenum. Blowers are installed in the inlet plenum to act as air movers. During ground operation or when the airplane is unpressurized, air is drawn through the ducts past a flow control valve, and is discharged overboard through the exhaust port (Fig. 1).
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