TM 55-1520-240-23-7
8-80.5.1
TEST AND ADJUST FUEL QUANTITY INDICATOR USING PSD 60-1AF FUEL QUANTITY
TEST SET
(Continued)
8-80.5.1
9.
If measuring a MAIN TANK, connect "T" cable
lead marked "MAIN LOZ" to TU terminal (J-4).
10.
If measuring an AUX TANK, connect "T" cable
lead marked "AUX LOZ" to TU terminal (J-4).
11.
Rotate tester FUNCT switch to MEASURE EXT.
12.
Rotate tester SELECT switch to TU.
13.
Read and record cable LOZ-HIZ capacitance
displayed on LCD. If capacitance is over .5 pf,
repair or replace cable.
14.
Disconnect fuel quantity system harness from
tank wall connector listed below:
TANK
HARNESS#
TANK
CONN#
RIGHT MAIN
300W7
057W2
LEFT MAIN
300W6
057W9
FWD RT AUX
300W4
057W1
FWD LT AUX
300W2
057W10
AFT RT AUX
300W5
057W5
AFT LT AUX
300W3
057W6
NO BREAK - WORK HARDER
15.
If measuring a MAIN TANK, connect "T" cable
(P-1) to tank wall connector DO NOT connect
(J-1) to aircraft wiring connector.
16.
If measuring an AUX TANK, connect "T" cable
(P-2) to tank wall connector. DO NOT connect
(J-2) to aircraft wiring connector.
17.
Read capacitance of "T" cable plus empty tank
on tester LCD.
18.
Subtract capacitance measured in step 13 from
reading in step 17. This is actual empty tank
capacitance, compare with Table 1.
TABLE 1 — FUEL TANK CAPACITANCE VALUES
EMPTY
TANK
MIN
NOMINAL
MAX
ADDED
NOMINAL
FULL
NOMINAL
READING IN LB
MAIN
360.7 pf
361.7 pf
367.9 pf
434.4 pf
796.1 pf
2200
AUX
120.2 pf
121.6 pf
122.7 pf
144.8 pf
266.4 pf
950
8-247
