C77176
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 BEJ 061, 062 WITH SB 21-1102,  ú 21-52-00
 AND BEF 101-999  ú CONFIG 2 ú 10 Page 108 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Ram Air Door Stays Open In Cruise
(RAM DOOR FULL OPEN Light Stays On Continuously)
Figure 102 (Sheet 4)

C72558
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. BEJ 061, 062 WITH SB 21-1102, ú

 21-52-00
 AND BEF 101-999  ú CONFIG 2 ú 10 Page 109 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

THERE IS CONTINUITY - Do a continuity test from connector D458B, pin 44 (left WDM 21-64-02, right WDM 21-64-03). IF -(D458A, pin 7), and an airplane ground

shooting (AMM 32-09-10/101) and repair the problems that you find. THERE IS CONTINUITY - Do trouble-

THERE IS NO CONTINUITY - Repair the problems in the wiring that you find.
pin 28 (connector D458A, pin 28), to tinuity test from connector D458B, the TE flaps up limit switch, S290, pin 6 (stall warn switch, S856, pin 3) THERE IS NO CONTINUITY - Do a con-(left WDM 21-64-02, right WDM 21-64-03). IF -

flaps up limit switch, S290 (stall warn switch, S856). THERE IS CONTINUITY - Replace the TE 

Ram Air Door Stays Open In Cruise
(RAM DOOR FULL OPEN Light Stays On Continuously)
Figure 102 (Sheet 5)

C72772
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. BEJ 061, 062 WITH SB 21-1102, ú

 21-52-00
 AND BEF 101-999  ú CONFIG 2 ú 10 Page 110 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

sure there is 115V AC on the bus side THERE IS NO VOLTAGE INDICATION - Make of the RAM MOD L (RAM MOD R) circuit breaker. IF -

THERE IS NO VOLTAGE INDICATION - Do troubleshooting (AMM 24-21-00/101) and repair the problems that you find. 

Ram Air Door Stays Open In Cruise
(RAM DOOR FULL OPEN Light Stays On Continuously)
Figure 102 (Sheet 6)

C72786
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. BEJ 061, 062 WITH SB 21-1102, ú

 21-52-00
 AND BEF 101-999  ú CONFIG 2 ú 10 Page 111 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 RAM AIR SYSTEM - ADJUSTMENT/TEST
________________________________
 1.  General_______
 A.  This procedure has two tasks. The tasks are:
 (1)  
Ram Air System Operational Test

 (2)  
Ram Air System Drag Test

 B.  The operational test makes sure that the system will operate correctly on the ground or in the air. During the test the flaps are retracted. The flaps must be retracted electrically. Instructions are also supplied to retract the flaps hydraulically.
 C.  The drag test makes sure that the mechanical friction is not more than an approved limit.
 TASK 21-52-00-705-024
 2.  Ram Air System Operation Test_____________________________
 A.  General
 (1)  
The test of the modulation system for the ram air makes sure that:

 (a)  
The system controls the airflow during the flight.

 (b)  
The doors and the panels move to the correct position and supply the correct cooling airflow for the operation of the air conditioning packs on the ground and in flight.

 (2)  
Look at 20-10-27/201 before you use heating equipment on the system components during this test.

 B.  Special Tools and Equipment
　
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