TABLE 3
(b) (c) (d) (e) Open GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6. Disconnect electrical plug connector at each fuel quantity indicator except the one indicator being calibrated. Close GRD FUELING and FUEL QTY circuit breakers on circuit breaker panel P6. Adjust fuel quantity indicator on P2 panel to respective full value given in Table 4 by means of full adjustment screw at rear of indicator.
INDICATOR FULL ADJUSTMENT READINGS
FUEL TANK FUEL & FUELING QUANTITY INDICATOR
No. 1, 2 Center (Integral) 10,000 +50 Lbs 16,800 +50 Lbs
TABLE 4
(f)
Press to test fuel quantity indicator test button; indicator pointer or dial shall move downscale. Release test button; indicator shall return to adjusted full position.
(g)
If fuel quantity pointer or dial does not return to adjusted full position after press-to-test switch operation, repeat steps (e) and (f).
(h)
Adjust fueling quantity indicator on fueling control panel P15 to value given in Table 4 by means of full adjustment screw at rear of indicator.
(i)
Press fueling indicator test switch to TEST GAGE position. 1) On P15 panel, fueling quantity indicator pointer shall move downscale. 2) On P2 panel, fuel quantity indicator pointer shall move upscale.
(j)
Release test switch. 1) On P15 panel, fueling quantity indicator pointer should return to original position
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+ 50 pounds.
2) On P2 panel, fuel quantity indicator pointer should return to original position + 50 pounds.
(k) If fueling quantity indicator pointer does not return to adjusted position, repeat steps
(h) thru (j).
(4) Check system empty adjustment.
NOTE: A recheck of calibration procedures is advisable as there may be electrical interactions between empty and full adjustments.
(a) Repeat steps 3.D.(1) (g) thru 3.D.(2).
(5) Perform comparison check of Fuel Quantity Indicating System (FQIS) using the fuel measuring sticks.
(a)
Open fueling station door.
(b)
Calculate the fuel quantity for each tank using the fuel measuring sticks (AMM 12-11-0).
(c)
Verify that the calculated fuel quantity (using fuel measuring sticks) for each tank is within the following value of the fuel quantity shown on the fuel quantity indicator is within +/-400 lbs.
(d)
Close fueling station door.
E. Return Airplane to Normal
(1)
Open GRD FUELING and FUEL QTY circuit breakers on P6 panel.
(2)
Disconnect system tester from test set harness.
(3)
Disconnect test set harness from airplane wiring bussing plug.
(4)
Reconnect tank and compensator unit bussing plug to fuel tank bulkhead receptacle on wing spar.
(5)
Remove leading edge flap locks (AMM 27-81-0/201).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONS.
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FUEL QUANTITY INDICATING SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
Airplanes with Precalibrated Indicators
1. General
A. The fuel quantity indicating system measures the weight of usable fuel in the fuel tanks. Precalibrated fuel quantity indicators on the pilots' center instrument panel (P2) and indicators at the fueling station provide visual indication of the fuel weight in each of the tanks. In addition, a fuel summation unit located on the first officer's auxiliary panel P23 provides a continuous summation signal input to an on-board computer where it is converted to an on-demand display of combined tank total remaining fuel or is used by the computer in various performance parameters. In each of fuel tanks No. 1 and 2, five fuel measuring sticks are provided to determine fuel quantity of the respective tank by mechanical means. Measuring sticks are not provided for the center tank.
B. System components are located in the control cabin, in the fuel tanks, and at the fueling station (Fig. 1). Control cabin components consist of fuel quantity indicators, a fuel summation unit, and a fuel quantity indicator test switch. Fuel tank components consist of tank units, compensator units and fuel measuring sticks. Fueling quantity indicators and a fueling quantity indicator test switch are located at the fueling station panel (P15). The fueling quantity indicators are interchangeable with the corresponding fuel quantity indicators located on pilots' center instrument panel (P2).
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