7. Operation/Control and Indicating
________________________________
 For full operation of the quantity indicating system it is necessary to:
 -energize the 28VDC ESS BUS (801PP) (channel 1 supply) and the 28VDC BUS 2 (206PP) (channel 2 supply) and 28VDC FUELLING BUS 2 (502PP)
 -
close the related circuit breakers 1QT (801PP), 2QT (206PP) and 8QT (502PP).

 A.
 Operation/Control

 The FQIC has full control of the FQI system. Each fuel probe has an electrical capacitance value that is in relation to the depth of fuel in the related tank. The FQIC uses the probe capacitance values and the fuel permittivity to find the volume of usable fuel in that tank.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The cadensicons 19QT1(19QT2) and 20QT send signals to the FQIC from which the density of the fuel is calculated.
 The FQIC uses the fuel volume calculation, together with the density data, to find the fuel mass (fuel quantity). This is then transmitted to the EWD (Ref. 31-66-00) and the SD (FUEL page) (which together make up the ECAM).
 **ON A/C 301-399,
 The ultracomps 50QT and 52QT and the dualcomp 53QT send signals to the FQIC from which the density of the fuel is calculated.
 The FQIC uses the fuel volume calculation, together with the density data, to find the fuel mass (fuel quantity). This is then transmitted to the EWD (Ref. 31-66-00) and the SD (FUEL page) (which together make up the ECAM).
 1EFF : ALL 1 28-42-00Page 77 1 1 Aug 01/05 1 1 1CES 1 1EFF : ALL 1 28-42-00Page 78 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL
 B. Refuel/Defuel Operations (Ref. 28-25-00)
 During a refuel or defuel operation the FQIC also supplies fuel quantity data to the: - preselector 5QT - multi-tank indicator 6QT.
 If the FQIC has no data, the indicator and the preselector do not operate and the LED displays will be blank.
 (1) Cockpit Indications
 (a) Usual Indications 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
 (Ref. Fig. 012) 
R  **ON A/C 301-399,
 (Ref. Fig. 012A) 
R  **ON A/C 401-499,
R  (Ref. Fig. 012B) 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (b) Degraded-Mode (For One Tank)
 If the fuel quantity indication data is between 3 and 5 times less accurate than that specified for normal operation, then degraded-mode indications are given. The indication for the applicable tank is still shown on the SD FUEL page, but the last two numbers have two (amber) horizontal lines through them.
 If the same failure occurs during a refuel/defuel operation (with the refuel/defuel panel door open), the components that follow show a dash in place of the least significant digit:

 SD (FUEL Page) - Fuel Quantity Indications
 Figure 012

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-42-00Page 79 1201-299, 1Aug 01/05 1 1 1CES 1

 SD (FUEL Page) - Fuel Quantity Indications R Figure 012A
R 1EFF : 301-399, 1 28-42-00Page 80 1 1 Aug 01/05 1 1 1CES 1

 SD (FUEL Page) - Fuel Quantity Indications R Figure 012B
R 1EFF : 401-499, 1 28-42-00Page 81 1 1 Aug 01/05 1 1 1CES 1

 -
the indicator (6QT)

 -
the ACTUAL fuel quantity on the preselector (5QT).

 Degraded mode will be caused by any one of the conditions that follow:
 -FQI probe No. 14 failed (wing tanks only)
 -any two FQI probes, not associated with a common FQIC oscillator failed
 -more than one FQI probe associated with a common FQIC oscillator failed
 -
FQIC oscillator 1 failed

 -
FQIC oscillator 2 failed.

 **ON A/C 301-399,
 (b) Degraded-Mode (For One Tank)
 If the fuel quantity indication data is between 3 and 5 times less accurate than that specified for normal operation, then degraded-mode indications are given. The indication for the applicable tank is still shown on the SD FUEL page, but the last two numbers have two (amber) horizontal lines through them.
 If the same failure occurs during a refuel/defuel operation (with the refuel/defuel panel door open), the components that follow show a dash in place of the least significant digit:
 -
the indicator (6QT)

 -
the ACTUAL fuel quantity on the preselector (5QT). Degraded mode will be caused by any one of the conditions that follow:

 -
wing tank probe 2 and 3 failed

 -
wing tank probe 3 and 4 failed

 -
wing tank probe 4 and 5 failed

 -
wing tank probe 6 and 7 failed
　
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