Calibration - Thrush Aircraft S2R–T660 Maintenance Manual

THRUSH AIRCRAFT INC – T660 TURBO THRUSH AIRCRAFT MAINTENANCE MANUAL

Calibration

The fuel quantity transmitter and indicator have been calibrated at the factory and should not
require recalibration. However, if for some reason the system requires recalibration, the electrical
system should be carefully checked prior to recalibration. When necessary, the fuel quantity
indicating system is calibrated as follows:
A. Defuel aircraft as outlined in Section II.
B. Connect an APU (auxiliary power unit) to the external power connector.
C. Turn APU on and adjust to 27.5 volts.
D. Turn battery switch ON. Readjust APU to 27.5 volts, if necessary.
E. Place fuel quantity switch to L.H. MAIN tank.
F. With the transmitter float resting on the bottom of the fuel tank, set indicator needle to the
empty mark by adjusting the screw on front of indicator.
G. Raise float to touch top of fuel tank and set indicator needle to the full mark by adjusting
trimmer screw on back of indicator.
H. Place fuel quantity switch to R.H. MAIN tank.
I. Repeat steps F and G for right fuel tank.
J. Turn battery switch OFF.
K. Turn APU OFF.
L. Level aircraft as outlined in Section II.
M. Disconnect right fuel tank fuel line at header tank. Cap header tank fitting and disconnected
fuel line.
N. Fill header tank and lines with fuel.
O. Add one (1) U.S. gallon of fuel to each wing tank.
P. Turn APU ON.
Q. Turn Battery switch ON.
R. Check fuel quantity indicator for correct reading of each tank. Indicator should read empty
(O) at one gallon.
S. Complete the calibration (see Table below on this page).
T. After completion of the preceding steps, the calibration should be correct. If not, check
transmitter float arm for correct down (empty) position and correct by bending float support
arm as needed. Recalibrate system and check for correct reading.
U. If the system is still out of calibration, remove and replace the transmitter and/or the
indicator.
5 -5
Effective: 12/17/03