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A
737-300/400/500MAINTENANCE MANUAL
 S 012-078
 (12)
 Remove the applicable access panel for the dry bay for the boost pumps (AMM 28-22-41/401).

 S 492-081

 (13)
 Prepare the external power control unit (PCU) (Fig. 204).

 (a)  Remove the cable assemblies from their container.
 (b)  Put the PCU on the top of its container.
 (c)  Make sure the PCU control panel is a minimum of 30 inches above
 the ground.
 (d)  Put the container and the PCU near the applicable boost pumps.
 (e)  Make sure you can easily connect the PCU to the boost pumps
 with the cables.
 (f)  Disconnect the connector plug for the airplane wire bundle at
 the boost pump receptacle (AMM 28-22-41/401).
 (g)  Connect the applicable cable assembly between the PCU and the
 airplane.
 NOTE: Examine the marker instructions on the cable assembly____
 and the chart. Make sure you have the correct airplane
 model and the correct fuel component connections
 (Fig. 204).
 (h)  Disconnect the connector plug for the airplane wire bundle at
 the applicable low pressure switch on the wing front spar
 (AMM 28-42-11/401).
 (i)  Connect the applicable cable assembly between the PCU and the
 pressure switch on the wing front spar.
 NOTE: Examine the marker instructions on the cable assembly____
 and the chart. Make sure you have the correct airplane
 model and the correct fuel component connections.
 (j)  Connect the cable assembly for the power supply to the ground
 power cart or carts which supply 3-phase 115V AC and 28V DC.
 NOTE: The end of the cable with the terminal lug goes to the____
 ground power cart.

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A 737-300/400/500MAINTENANCE MANUAL

CONTAINER FOR THE PCU

M-NUMBERS AND S-NUMBERS REFER TO
IDENTIFICATION NUMBERS USED IN WIRING
DIAGRAM MANUAL EQUIPMENT LISTS

SEE
B

2 REFER TO WIRING DIAGRAM MANUAL (WDM)

External Power Control Unit
Figure 204 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL

NOTES:

FUEL BOOST PUMP (M-NUMBERS)
LOW PRESSURE WARNING SWITCH (S-NUMBERS)
CABLE CONNECTOR PLUG

J4 
J2 
J3 

F70316-5
EXTERNAL POWER CONTROL UNIT (PCU)

CABLE AND ADAPTER IDENTIFICATION

External Power Control Unit
Figure 204 (Sheet 2)

FUEL BOOST PUMP M46, M47, M48, M49, M234, M235
TO AIRPLANE GROUND
FUEL BOOST PUMP M46, M47, M48, M49, M234, M235
TO AIRPLANE GROUND
BOOST PUMP PRESSURE SWITCH S150, S151, S152, S153
BOOST PUMP PRESSURE SWITCH S154 OR S155
BOOST PUMP PRESSURE SWITCH S150, S151, S152, S153
BOOST PUMP PRESSURE SWITCH S154 OR S155
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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