C. Procedure
S 424-010
(1)
Put the fan and the duct assembly on the bracket and attach it with the fasteners and the synclamps.
S 434-011
(2)
Install the ground wire.
S 434-012
(3)
Install the wires on the terminal block.
S 434-013
(4)
Put the fan assembly on the structure and attach it with the 1/4-turn fasteners.
S 434-014
(5)
Attach the flexible duct to the fan duct assembly and tighten the clamp.
S 434-015
(6)
Install the electrical connector to the fan assembly.
D. Do a check of the Fan Operation
S 864-016
(1)
Supply electrical power (Ref 24-22-00/201).
S 864-017
(2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P6-4 Panel
1) TEMP CONTROL, AUTOMATIC, L
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-61-64
ALL ú ú 02 Page 402 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 724-018
(3)
Put the L PACK switch to the AUTO or the HIGH position.
S 714-023
(4)
Make sure the fan operates and air flows through the sensor inlet for the control cabin.
E. Put the Airplane Back to Its Usual Condition
S 864-019
(1)
Put the L PACK switch to the OFF position.
S 414-020
(2)
Install the lining in the control cabin.
S 864-021
(3)
Remove the electrical power if it is not necessary
(Ref 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-61-64
ALL ú ú 01 Page 403 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TEMPERATURE SENSOR
SEE A
TEMPERATURE SENSOR
FLEXIBLE DUCT AIR INLET
CEILING PANEL
TEMPERATURE
CONTROL CABIN SENSOR FAN
SEE B
DUCT CLAMP
FAN/DUCT ASSEMBLY
TEMPERATURE SENSOR
A
FAN/DUCT RED BRACKET FASTENER
YELLOW
(4 LOCATIONS) BLUE
TERMINAL
BLOCK FAN/DUCT ASSEMBLY
QUARTER-TURN
FASTENER
(2 LOCATIONS)
GROUND WIRE
FAN SYNCLAMP (4 LOCATIONS)
TEMPERATURE SENSOR FAN
ELECTRICAL
CONNECTOR
B
Control Cabin Temperature Sensor Fan Installation
Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-61-64
ALL ú ú 01 Page 404 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
AIR MIX VALVE POSITION INDICATOR CONTROL UNIT - DESCRIPTION AND OPERATION
_________________________________________________________________________
1. General (Fig. 1)_______
A. The position indicator control unit (printed circuit card A1 located in P5-17 module) provides regulated voltage and circuit adjustment for position indicators used in the temperature control system.
B. Power to the control unit is from 28 volt dc bus No. 2 on load control center P6-4.
C. Regulated current then passes from the control unit to two different position transmitters. Each transmitter is mechanically linked to a valve so that as the valve moves the resistance of the transmitter in the circuit to the position indicator varies. As the resistance varies, so does current, and a corresponding change is induced in the position indicator. A zener diode between power and ground prevents a fluctuating power source from affecting position indication.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737-300 400 500 AMM 飞机维护手册 空调 AIR CONDITIONING 2(164)
