Ram Air Door Stays Open In Cruise
(RAM DOOR FULL OPEN Light Stays On Continuously)
Figure 102 (Sheet 4)
C72534
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21-52-00
ú CONFIG 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
IF -THERE IS CONTINUITY - Do a continuity and an airplane ground (WDM 21-64-01). test from connector D458B, pin 28
problems that you find. ing (AMM 32-09-10/101) and repair the THERE IS CONTINUITY - Do troubleshoot-
THERE IS NO CONTINUITY - Repair the problems in the wiring that you find.
ity test from connector D458A, pin 28, THERE IS NO CONTINUITY - Do a continu-pin 6 (WDM 21-64-01). IF -to the TE flaps up limit switch, S290,
flaps up limit switch, S290. 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)
C72564
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21-52-00
ú CONFIG 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
breaker. IF -of the RAM MOD L (RAM MOD R) circuit THERE IS NO VOLTAGE INDICATION - Make sure there is 115V AC on the bus side
repair the problems that you find. troubleshooting (AMM 24-21-00/101) and THERE IS NO VOLTAGE INDICATION - Do
Ram Air Door Stays Open In Cruise
(RAM DOOR FULL OPEN Light Stays On Continuously)
Figure 102 (Sheet 6)
C72778
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. BEJ 061, 062, WITHOUT SB 21-1102 ú
21-52-00
ú CONFIG 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 - TROUBLE SHOOTING
_________________________________
1. General_______
A. If a system trips off from overheat but without excess air supply, the ram air system should be suspected. Make sure that the ram air inlet and exhaust doors are open. If unwanted material such as paper or cloth are ingested into the ram air system, they could restrict air flow through the system. Inspection doors are provided in the ram air ducts forward of each heat exchanger for duct inspection. If difficulty occurred during flight while flaps were in any position other than fully retracted, do a check of the cooling system (AMM 21-51-00/501). If the system has tripped off without excessive temperature being recorded, the thermal switches may be defective and should be checked.
B. It is recommended that 20-10-27, Maintenance Practices, be reviewed before using heating equipment on system components.
2. Equipment and Materials_______________________
A. Tempcal Multirange Thermocouple and Thermal Switch Tester - H294 with BH 17336 probe.
3. Trouble Shooting________________
A. Trouble shooting is provided for these faults:
(1)
RAM DOOR FULL OPEN light(s) will not come on when the airplane is on the ground (Figure 101).
(2)
Ram air door stays open in cruise (RAM DOOR FULL OPEN light(s) stays on continuously) (Figure 102).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
BEJ 061, 062 WITH SB 21-1102, ú 21-52-00
AND BEF 101-999 ú CONFIG 2 ú 10 Page 101 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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