| System A or B Flight control or| | Position applicable flight | Perform flight| | pressure |spoiler leakage | control and spoiler switch | control and| | below 2800 | | OFF. If pressure recovers | spoiler leak| | psi (both | | to within limits, | check.| | pumps | | | Replace| | operating | | | components as| | | | | necessary.| | | | | | | | | If pressure remains low | Replace systems| | | | | pressure module| | | | | (AMM 29-15-71).| | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | .................................................................................
| ENG (1 or 2) The electric| | Operate the EDP with the | If the system |
| LOW PRESSURE motor driven| | EMDP off. Stop the EDP | operates as |
| light is slow pump (EMDP) was| | and make sure the ENG LOW | shown in the |
| to come on on when you| | PRESSURE light comes on. | Isolation |
| after the stopped the| | Start the EMDP and make | Procedure to |
| pump is engine driven| | sure the ENG LOW PRESSURE | the left, the |
| stopped. pump (EDP).| | light stays on. | system is O.K. |
| | | | No repairs are |
| | | | necessary. |
| | | | |
| ENG (1 or 2) Leaking check| | Operate the EDP with the | Replace leaking|
| LOW PRESSURE valve in pressure| | EMDP off. Stop the EDP | check valve. |
| light goes module or in| | and make sure the ENG LOW | |
| off when the pressure line| | PRESSURE light comes on. | |
| EMDP is to thrust| | | |
| operated reverser.| | | |
| | | | |
| Hydraulic Hydraulic leak| | Perform leak check | Repair or |
| fluid | | (AMM 29-00-00/601). | replace |
| quantity | | | defective |
| low | | | components. |
| | | | |
| Fluid quantity| | (AMM 29-33-01/101) | |
| indicating| | | |
| | | | |
| Hydraulic fluid| | See steps for | Use correct |
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