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737-300/400/500MAINTENANCE MANUAL
~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................. | Electrical |Ground Fault | SYS ELEC HYD PUMP circuit| | | power to |Detector | breaker will not open| | | EMDP |Interrupt | during a ground fault| | | interrupted | | interrupt. Check that| | | during | | appropriate SYS ELEC HYD| | | normal | | PUMP circuit breaker (P6)| | | operation | | has not opened.| | | | | Disconnect electrical| | | | | connector from pump| | | | | motor.| | | | | | | | | | CAUTION:_______DO NOT RESET| | | | | GROUND FAULT| | | | | DETECTOR BEFORE| | | | | DISCONNECTING| | | | | ELECTRICAL| | | | | CONNECTOR FROM| | | | | PUMP MOTOR.| | | | | RISK OF FIRE| | | | | EXISTS.| | | | | | | | | | Reset system Ground Fault| | | | | Detector. System A Ground| | | | | Fault Detector (M1105) is| | | | | located on upper inboard| | | | | corner of bulkhead behind| | | | | hinged P6-2 panel. System| | | | | B Ground Fault Detector| | | | | (M1106) is located on| | | | | lower inboard corner of| | | | | bulkhead behind hinged| | | | | P6-1 panel.| | | | | | | | | | Install a jumper wire| | | | | between pins 4 and 5 on| | | | | pump electrical connector.| | | | | | | | | | Turn pump switch on.| | | | | | | | | | On electrical connector, | Replace EMDP| | | | measure voltage between | assembly| | | | pin 1 and pin 5. If 115 | (AMM 29-15-22/| | | | volts AC exists, | 401)| | | | | | | | | If 115 volts AC does not | Replace ground| | | | exist between pin 1 and | fault| | | | pin 5, | detector.| | | | | |
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737-300/400/500MAINTENANCE MANUAL
~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................. | ABEX EMDP | | | | | The EMDP |Insufficient fuel | Turn off pump. Fuel main | Recheck| | OVERHEAT |in main tank | tank. Permit pump and | system. If| | light is on |(250 gallons/1675 | reservoir to cool to | trouble| | |pounds/760 | ambient temperature before | recurs,| | |kilograms | restart. | replace pump| | |required) | | (AMM 29-15-22).| | | | | | | |Case drain filter | Examine the filter for | Replace the| | |clogged | contamination | case drain and| | | | | pressure| | | | | filter element.| | | | | Flush the| | | | | lines and| | | | | replace the| | | | | EMDP (AMM| | | | | 29-15-22/401,| | | | | 29-15-34/201,| | | | | 29-15-71/201)| | | | | | 2..............…..................…............................…................1
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737-300/400/500MAINTENANCE MANUAL
~............................................................................... | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................. |System A or B |If symptoms happen| |Clean vent caps | |pressure |during descent but| |(AMM 29-09-00). | |drops when |cannot be repro-| |Remove the | |landing gear |duced on the | |reservoir pres- | |or flaps |ground, the prob- | |surization | |are selected. |lem may be water | |module filter | | |trapped in | |bowl and remove | | |reservoir pres-| |water as | | |surization system | |necessary. | | |freezing during | | | | |cruise. | | | ................................................................................. | |Reservoir pres-|No airflow from vent cap(s) |Replace filter. | | |surization module |between reservoir pressuri- | | | |filter plugged. |zation module and reservoirs| | | | |with engine running. | | ................................................................................. | |Reservoir pres-|On pre-reservoir pressuri-|Clean or replace| | |surization orifice|zation balance line air-|tee. | | |tee corroded or |planes, no airflow from vent| | | |plugged. |cap(s) between reservoir | | | | |pressurization module and | | | | |reservoirs with engine | | | | |running. | | | | |On airplanes with reservoir | | | | |pressurization system bal-| | | | |ance line, do reservoir | | | | |pressurization system test | | | | |per AMM 29-09-00. If, when | | | | |pressurizing the reservoirs | | | | |with a nitrogen source, no | | | | |pressure is shown on the | | | | |reservoir pressure gauges, | | | | |the orifice tee may be cor- | | | | |roded or plugged. | | ................................................................................. | |Reservoir pressur-|Do reservoir pressurization |Repair leaks as | | |ization system |system test per |necessary. | | |leakage. |AMM 29-09-00. | | ................................................................................. | |Engine-driven pump|Inspect for kinked hoses. |Replace hose. | | |supply hose liner |Remove hose and inspect | | | |collapse. |liner. | |
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