Smiths Aerospace
Electronic Systems – Malvern
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
BOEING B737-100/200/300/400/500
28-41-04
FUEL QUANTITY INDICATING SYSTEM – ADJUSTMENT/TEST
1. General
A. This procedure has these tasks.
(1) A test for the correct operation of the fuel quantity indicating system.
(2) A system test.
B. To do the test for the correct operation, you push the test switch in the control cabin and make sure
the indicators operate. You do this procedure again at the refuel control panel (P15) on the wing.
C. You must do a check of the value on the applicable fuel quantity indicator after you replace one of
these components:
(1) One of the tank units
(2) One of the in-tank wire harnesses
(3) One of the compensators
(4) One of the TSUs
D. Compare the value to this table to see if you must do a test of the fuel quantity indicating system:
NOTE:
You must do the check before you put the fuel in the tank.
ACTION
REQUIRED
TANKS NONE
SYSTEM
TEST
EMPTY
1 & 2
0 to +120 lbs
0 to +60 kgs
Over 120 lbs
Over 60 kgs
VALUE CENTER
0 to +180 lbs
0 to +80 kgs
Over 180 lbs
Over 80 kgs
E. If the value on an indicator changes suddenly, do a check for water in the applicable fuel tank (Ref
12-11-00/301).
F. An indicator in the control cabin is referred to as a fuel quantity indicator. An indicator in the refuel
control panel (P15) on the wing is referred to as a fueling or refuel quantity indicator.
2. Operational Test – Fuel Quantity Indication System
A. Access
(1) Location Zones
101
Control Cabin, Left
402
Right Wing Outboard Leading Edge
EFFECTIVITY
(2) Access Panels
6540
Refueling Station Access Door
CONFIG
4.3
Page 501
July 15/02
Airplanes with Smiths 2307 Model Fuel Quantity Indicators
with TSU
(BARFIELD SYSTEM TESTER)
