-
wing tank probe 10 and 11 failed

 -
wing tank probe 11 and 12 failed

 -
center tank probe 1 and 2 failed

 -
center tank probe 1 and 3 failed

 -
FQIC signal conditioning board 1 failed

 -
FQIC signal conditioning board 2 failed.

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 (c) FQI Failure (In One Tank)
 If the fuel quantity indication data is more than 5 times less accurate than that specified for normal operation, then the indication for that tank and the Fuel On Board (FOB) shows amber X's.
 If the same failure occurs during a refuel/defuel operation (with the refuel/defuel panel door open), the components that follow do show an indication:
 -
the indicator (6QT)

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

 -
wing tank probes 5 and 6 failed

 -
wing tank probes 7 and 8 failed

 -
wing tank probes 8 and 9 failed

 -
wing tank probes 9 and 10 failed

 -
center tank probes 3 and 5 failed

 -
center tank probes 4 and 5 failed

 -FQIC signal conditioning board 1 and 2 failed.
 (2) Refuel/Defuel Control Panel

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 002)
 **ON A/C 301-399,
 (Ref. Fig. 002A)
 **ON A/C ALL
 During a refuel or defuel operation the preselector 5QT shows: The ACTUAL quantity of fuel in the aircraft.
 -
The display shows the fuel quantity in units of 1000 kg (1000 lb)

 and to a resolution of 100 kg (100 lb). The PRESELECTED quantity of fuel for an automatic refuel.

 -
The display shows the fuel quantity in units of 1000 kg (1000 lb) and to a resolution of 100 kg (100lb).

 1EFF : ALL 1 28-42-00Page 83 1 1 Aug 01/05 1 1 1CES 1 The preselection switch is used to change the PRESELECTED quantity.

 The switch has three positions:
 -INC (increase)
 -neutral
 -DEC (decrease).
 The switch is biased to the neutral position. When the switch is initially set to the INC (or DEC) position, the rate of change in the figures of the PRESELECTED window display is slow. But after 4 seconds the rate of change increases. This difference gives a fine adjustment (slow rate change) and a coarse adjustment (fast rate change) of the PRESELECTED fuel quantity.
 The END annunciator LED
 When a refuel operation is completed, the END annunciator LED comes on. If an unusual condition occurs during refuel, the END annunciator LED flashes. It does this if:
 -all the high level sensors (Ref. 28-46-00) are wet before the ACTUAL fuel quantity equals the PRESELECTED fuel quantity (+ or -100kg (200 lb))
 -an ARINC transmission failure from the preselector 5QT occurs during the refuel procedure.
 - one of the two wing high level sensors (Ref. 28-46-00) is dry and the center tank contains more than 250kg (550lb) (when the automatic refuel is completed)
 - out of balance of the LEFT and RIGHT quantities is more than 200kg (450lb) and the two wing high level sensor (Ref. 28-46-00) are dry (when the refuel is complete)
 -the ACTUAL fuel quantity is more than the PRESELECTED fuel quantity
 -FQIS errors cause the FQIC to fail.
 C. Accuracy
 The FQI system is accurate to +/- 0.5% of each tanks total capacity + 0.5% of actual FOB. This is when the aircraft is on the ground between an attitude of +/- 3 degrees in both pitch and roll.
 In flight, during normal cruise attitude, the FQI system is accurate to + 1.0% and - (0.5% of total capacity + 0.5% of actual FOB). Normal cruise attitude is defined as between - 3 and + 5 degree's pitch and +/- 3 degree's roll. At higher attitudes the accuracy can be degraded to - 1.0% of the total capacity + 2.5% of actual FOB. Effective Attitude The FQIC takes acceleration data from the Air Data/Inertial Reference System (ADIRS) (Ref. 34-10-00) to calculate the effective attitude. If
 1EFF : ALL 1 28-42-00Page 84 1 1 Aug 01/05R 1 1 1CES 1

 this data is not available, then the FQIC uses the capacitance values from known fuel probes to calculate the effective attitude.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 If neither of these data sources are available it is assumed that the aicraft is at:
 -0 degrees pitch and 0 degrees roll on the ground
 - +2.0 degrees pitch and 0 degrees roll in flight.

 1EFF : ALL 1 28-42-00Page 85 1 1 Aug 01/05 1 1 1CES 1 **ON A/C 301-399,
　
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