7.
The indicator in the flight compartment Open Lo-Z
goes to the low end of the scale.
The refuel indicator follows.
8.
The indicator in the flight compartment Open Comp Lo-Z
reads HIGH.
The refuel indicator reads LOW.
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FAULT INDICATION (Cont) CAUSE OF THE FAULT (Cont)
9.
The indicator in the flight compartment Open shield reads HIGH. The refuel indicator follows the flight compartment indicator (normal)
10.
The indicator in the flight compartment Grounded Shield (other than at is sometimes erratic and indicator). undependable. Probably reads HIGH. Causes ground loop, induces
error in Hi-Z to indicator.
11.
The indicator in the flight compartment Low insulation is sluggish, travel time high, poor resistance between: repeatability of readings. -Hi-Z and Lo-Z The refuel indicator follows the flight -Hi-Z and Ground compartment indicator (normal) -Lo-Z and Ground
2. Prepare for Trouble Shooting
A. Provide external electrical power (Ref Chapter 24).
B. If fuel tank does not contain known quantity of fuel, establish true tank quantity (AMM 12-11-0, Fuel Servicing).
(1)
If trouble is in tank No. 1 or 2, use measuring stick to measure fuel quantity in tank.
(2)
If trouble is in center tank, transfer fuel in and out of tank No. 1 and 2 measuring fuel quantity in the process.
C. Ensure GROUND EP REFUELING, FUEL QTY, and CAPTAINS AND CTR PANEL AND INSTR LIGHT circuit breakers on P6 panel and PDC circuit breaker on P18 panel are closed.
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FUEL QUANTITY INDICATING SYSTEM-ADJUSTMENT/TEST
EFFECTIVITY
Airplanes with Non-Precalibrated Indicators
1. General
A. System adjustment consists of adjusting quantity indicators to EMPTY, FULL values by means of adjustment screws on indicators. Indicators on center instrument panel P2 are referred to as FUEL quantity indicators; repeater indicators on fueling panel P15 (Fig. 501) are referred to as FUELING quantity indicators.
B. There are two methods of fuel quantity indicating system adjustment:
(1)
Empty tank method (preferred) is accomplished without fuel in tanks or sumps. It is an accurate method as indicator's zero reading is set to actual empty tank condition assuring integrity of indicator's lower range. A capacitance value, applied to system by a precision tester, is substituted for equivalent quantity of fuel in tank. The indicator is adjusted to read this high range fuel quantity by means of FULL adjusting screw. This method is most accurate because it provides a means of measuring stray capacitance so it can be accounted for in the indicator adjustment.
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