21-52-00
ALL ú ú 02 Page 2 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
RAM AIR EXIT
RAM AIR DUCT ACCESS DOOR
RAM AIR INLET
SEE A
FWD
EQUIPMENT
BAY DOORS
RAM AIR INLET DUCT
INSPECTION
DOORS
PNEUMATIC CROSSOVER DUCT
RAM AIR TURBOFAN VALVE
CONTROL
RAM AIR
ACTUATOR
WATER SEPARATOR
SECONDARY HEAT EXCHANGER
PRIMARY HEAT EXCHANGER TO PNEUMATIC SYSTEM
TORQUE
SHAFT
TO APU
1
ROLLERS
RAM AIR EXIT
LOUVERS
EXHAUST RAM AIR
DUCT
1
INLET
FWD
RAM AIR INLET
TURBOFANTURBOFAN MODULATION PANEL
VALVE
DEFLECTOR DOOR
FWD
A
1
AIRPLANES PRE-SB 21-1123
Ram Air System Component Loocation
Figure 1
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21-52-00
ALL ú ú 02 Page 3 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
D. AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); The ram air actuator is controlled by relays in the Air Conditioning Accessory Unit and the ram air controller. The control is automatic and depends on whether airplane is on the ground, inflight with flaps extended or inflight with flaps positioned full up. When airplane is inflight with flaps full up, temperature of the air in the air cycle machine compressor discharge is sensed by the ram air controller to govern actuator position. There are four position switches in the actuator which work with the control system to obtain proper positioning of the inlet panel. The ram air actuator is mounted on the aft bulkhead of the ram air duct cavity.
5. Ram Air Inlet Modulation Panel Cable and Linkage System_______________________________________________________
A. The ram air inlet modulation panel and the deflector door are mechanically linked together and are operated by the ram air actuator through a cable system. The ram air actuator rod connects to a crank on the ram air modulation torque shaft quadrant assembly to drive the cable system.
B. Two cables extend forward from the torque shaft quadrant along the inboard side of the ram air duct cavity to the forward end of the cavity. The cables then pass through the forward end of the cavity and are secured to the ram air inlet modulation panel quadrant. The ram air inlet modulation panel quadrant drives the inlet modulation panel shaft which moves the inlet panels.
C. The deflector door is also driven by the ram air inlet modulation panel quadrant. An arm assembly which drives the deflector linkage is mounted beside the inlet modulating panel quadrant on the inlet modulating panel shaft. A lug on the shoulder of the arm assembly fits into a cutout in the shoulder of the quadrant. A cam link and torsion spring allows additional movement of the quadrant for modulating the inlet panel after the deflector linkage permits continued movement of the quadrant to the full extend position should the deflector fail to extend.
D. The ram air modulation torque shaft quadrant assembly and control cables may be reached by opening the ram air duct access door. Access to the deflector linkage and the ram air inlet modulation panel quadrant requires removing the air conditioning fairing panel below the ram air inlet. A grease fitting and bushing are located on the arm assembly which drives the ram air inlet deflector (Ref Chapter 12, Air Conditioning Ram Air Inlet Modulation Shaft Assembly Lubrication).
6. Ram Air Controller__________________
A. AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); The ram air controller electrically controls the ram air actuator to position the inlet modulation panel and the exhaust louvers during flight when flaps are up. The control unit is installed on the inboard side of the keel beam downstream of the turbofan. A temperature sensor is installed in the air cycle machine compressor discharge duct. See cooling air and ram air equipment location illustration, 21-50-00.
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