Smiths Aerospace
Electronic Systems – Malvern
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
BOEING B737-100/200/300/400/500
28-41-04
402
Right Wing Outboard Leading Edge
403
Right Wing Inboard Leading Edge
(2) Access Panels
6540
Refueling Station Access Door
D. Prepare for the System Test
(1) Connect the external electrical power (Ref 24-22-00/201).
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND
TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE
FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSON OR DAMAGE
TO EQUIPMENT.
(2) Extend the leading edge flaps (Ref 27-81-00/201).
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU
DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE
INJURY TO PERSON OR DAMAGE TO EQUIPMENT.
(3) Install the locks on the leading edge flaps (Ref 27-81-00/201).
(4) Remove all the fuel from the fuel tank and the fuel in the sumps (Ref 28-23-00/201).
NOTE:
If you do an adjustment of only one tank system, you can move the fuel into the other
tanks.
(5) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) FUEL
QTY
2) EP GND FUELING
CAUTION:
POWER MUST BE REMOVED FROM FUEL QUANTITY INDICATORS
WHEN CONNECTOR IS REMOVED OR DAMAGE TO INDICATORS MAY
RESULT.
(6) Remove the fuel quantity indicator and the DCTU from the pilots’ panel (Fig. 501), (AMM 28-41-
04/401).
(7) First, disconnect the indicator from the DCTU, next, disconnect the electrical connector from the
rear of the DCTU.
(8) Disconnect the TSU J1 and J2 connector plugs and install TSU jumper harness 201475-001 to
airplane wire bundle and tank harness. Connect harness ground jumpers together, and do not
ground to airframe.
(9) Do this task: Fuel summation Unit removal or V-REF/Totalizer removal as applicable (AMM 28-
41-04/401).
(10) Do this task: Fueling indicator removal (AMM 28-41-04/401).
CONFIG
4.1
Page 504
Dec 18/02
Airplanes with Smiths 2307 Model Fuel Quantity Indicators
with TSU
(GULL SYSTEM TESTER)
EFFECTIVITY