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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 .......................................................................... | The indicator in the flight compartment | Grounded shield (other | | is sometimes erratic and undependable. | than at indicator). | | Probably reads HIGH. | Causes ground loop, | | | induces error in Hi-Z to | | | indicator. | .......................................................................... | The indicator in the flight compartment | Low insulation | | is sluggish, travel time high, poor | resistance between: | | repeatability of readings. | - Hi-Z and Lo-Z | | The refuel indicator follows the flight | - Hi-Z and Ground | | compartment indicator (normal) | - Lo-Z and Ground | 2............................................…...........................1
 2.  Prepare for Trouble Shooting____________________________
 A. Procedure
 (1)  
Supply electrical power (Ref 24-22-00/201).

 (2)  
Make sure these circuit breakers are closed:

 (a)  On the main power distribution panel, P6: 1) EP GND FUELING 2) QTY 3) CAPT AND CTR PANEL AND INSTR LIGHT
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

NOT OK NOT OK
NOT OK NOT OK
OK

THE VALUES ON THE INDICATORS DO NOT DECREASE SMOOTHLY -
NOT OK
Replace the fuel quantity test switch, S257, on the P2 panel.
OK
Troubleshooting for the Fuel Quantity Indicating System
Figure 101 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Read the total fuel quantity from the FMCS CDU by the applicable procedure:
1. If the IRS is not aligned:
A. Push the INIT REF key. Make sure the POS INIT page is shown on the CDU.
B. Push the LSK (line select key) 6L (adjacent to < INDEX on the CDU screen display). Make sure the INIT/REF INDEX page is shown.
C. Push the LSK 3L, < PERF keys. Make sure the PERF INIT page is shown with the total fuel quantity shown on the left side of the screen.
2. If the IRS is aligned:
A. Push the INIT REF key. Make sure the PERF INIT page is shown with the total fuel quantity shown on the left side of the screen.
The total fuel quantity shown must be equal to the total of all the fuel quantity
indicators with a tolerance of |100 pounds (|50 kilograms).

IF -Total fuel quantity is not equal to the total of all the

NOT OK
fuel quantity indicators with a tolerance of |100 pounds (|50 kilograms) -FIG. 103, PROCEDURE 3
OK
Troubleshooting for the Fuel Quantity Indicating System
Figure 101 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Troubleshooting for the Fuel Quantity Indicating System
Figure 101 (Sheet 3)

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