29-15-00
ALL ú ú 02 Page 111 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................. | |Engine-driven pump|Inspect quick-disconnect for|Replace hose. | | |supply hose quick-|breakage. | | | |disconnect broken.| | | | |Center body of | | | | |disconnect may | | | | |have broken loose,| | | | |obstructing flow. | | | .................................................................................
| |Faulty check |Pin landing gear. Turn on |Replace check |
| |valves in nose |System A electric motor- |valves. |
| |landing gear |driven pump. Select gear | |
| |steering lines |Down, after 5 minutes feel | |
| |(System A only). |check valves; if hot, re- | |
| |If leaky, these |place check valve. Select | |
| |check valves can |gear Up, after 5 minutes, | |
| |allow flow to go |feel check valves; if hot, | |
| |directly from |replace. | |
| |pressure to return| | |
| |(Landing gear Up | | |
| |to Down, or Down | | |
| |to Up), creating a| | |
| |high flow demand | | |
| |and possible re- | | |
| |duced system | | |
| |pressure. | | |
................................................................................. | |Faulty engine-| |Replace pump. | | |driven pump. | | | 2..............…..................…............................…................1
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29-15-00
ALL ú ú 01 Page 112 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
4. Standby Hydraulic System Trouble Shooting Chart
_______________________________________________ ~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | .................................................................................
Low| Faulty pressure| | Check for continuity at | Replace|
pressure| switch| | standby pressure module | pressure|
light| | | pressure switch. If | switch|
illuminated| | | there is continuity, | (AMM 29-34-31).|
| pump | | | |
| operating | | | |
| | | | |
Pump| Faulty standby| | Check indicator on | Replace|
operating,| rudder shutoff| | standby rudder shutoff | standby rudder|
standby| valve| | valve. If closed, | shutoff valve|
rudder not| | | | (AMM 27-21-94).|
| powered | | | |
| | | | |
Pump| Faulty leading| | Check indicator on | Replace|
operating| edge device| | leading edge device | leading edge|
leading| shutoff valve| | shutoff valve. If | device shutoff|
edge| | | closed, | valve|
devices not| | | | (AMM 27-81-91).|
| deploying | | | |
| | | | |
Pump not| Faulty standby| | Check for power and | Replace|
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