(2)
Procedure 2 OFF SCHED DESCENT Light Comes On But Does Not Go Out After a Short Time (approximately 3 minutes) in AUTO Mode.
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737-300/400/500MAINTENANCE MANUAL
(3) (4) Procedure 3 Procedure 4 OFF SCHED DESCENT Light Comes On Momentarily (1 to 10 seconds) Upon Touchdown.Ground Pressurized or Ground Unpressurized Circuits Not Functional
(5) (6) (7) Procedure 5 Procedure 6 Procedure 7 AUTO FAIL and STANDBY Lights Do Not Come On with all Power Applied with Mode Selector in CHECK.STANDBY Light Comes On when Fault is Checked with STBY Mode InoperativeAUTO FAIL Light Fails to Reset or STANDBY Light Continually on Regardless of Control Panel Settings for AUTO or STBY. AC and DC MAN Normal.
(8) Procedure 8 Outflow Valve Does Not Respond to Barometric Correction. Ground Unpressurized and Ground Pressurized Checks are Normal.
(9) Procedure 9 Outflow Valve Does Not Respond Properly to Isobaric Schedule Check. Barometric Correction Check is Good
and Ground Unpressurized and Ground Pressurized Checks are good.
Figure 102 Cabin Pressure Control System STANDBY Mode Troubleshooting
(1)
Procedure 1 STANDBY Light Not Illuminated.
(2)
Procedure 2 Outflow Valve Does Not Respond to Isobaric Schedule Check. Barometric Correction Check is Good and Ground Unpressurized and Ground Pressurized Checks are Good.
(3)
Procedure 3 Outflow Valve Does Not Respond at All.
(4)
Procedure 4 Outflow Valve Does Not Go Open with FLT-GRD Switch in GRD. Other Responses Normal
(5)
Procedure 5 Outflow Valve Does Not Respond to Barometric Correction Input. Ground Operation Normal.
(6)
Procedure 6 Outflow Valve Does Not Respond Properly to CAB ALT
Control.Figure 103 Cabin Pressure Control System DC MANUAL Mode Troubleshooting
(1)
Procedure 1 Outflow Valve Does Not Respond in Ground or Flight Operation.
(2)
Procedure 2 MANUAL Light Does Not Illuminate.
(3)
Procedure 3 Outflow Valve Responds to OPEN/CLOSE Toggle Switch in
One Direction Only.Figure 104 Cabin Pressure Control System AC MANUAL Mode Troubleshooting
(1)
Procedure 1 Outflow Valve Does Not Respond in Ground or Flight Operation.
(2)
Procedure 2 Outflow Valve Responds to OPEN/CLOSE Toggle Switch in
One Direction OnlyFigure 104A Cabin Pressure Controller Internal Fuse Tests
(1)
Procedure 1 AC and DC Clutch Coil Fuse Test (Fuse F2 and Fuse F1)