R **ON A/C ALL
D. Fuel Quantity Preselector 5QT
The preselector includes these components: - an electronic module - an end plate module - a green Light Emitting Diode (LED) display module - an END annunciator LED - a CKPT (cockpit) priority annunciator LED - an INC/DEC rocker switch.
The preselector gets fuel quantity data from the FQIC through an ARINC 429 bus. The LED display module then gives these fuel quantity indications: - the preselected quantity (PRESELECTED) - the total quantity (ACTUAL).
R **ON A/C 301-399,
R R R R R R R R The preselector is pre-programmed to display in either kgs or lbs. The preselector receives the numbers to be displayed from the FQIC. The FQIC also sends an identification bit that will identify if the numbers sent are in kgs or lbs. If there is a difference between the identification bit and the preselector program, the preselector prevents an LED display.
R **ON A/C ALL
E. Multi-Tank Indicator 6QT
The multi-tank indicator includes these components: - an electronic module - an end plate module - a green LED display module.
The indicator gets fuel quantity data from the FQIC through an ARINC 429 bus. The LED display module then gives these fuel quantity indications: - the LH wing tank (LEFT) - the RH wing tank (RIGHT) - the center tank (CTR).
If there is a difference between the identification bit and the indicator program, the indicator prevents an LED display.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
F. FQI Probe
(Ref. Fig. 007)
Wing Tanks - 21QT1(21QT2) thru 34QT1(34QT2).
Center Tank - 35QT thru 39QT.
**ON A/C 301-399,
F. FQI Probe (Ref. Fig. 007A) Wing Tanks - 21QT1(21QT2), 23QT1(23QT2), 25QT1(25QT2) thru 30QT1(30QT2), 34QT1(34QT2), 54QT1(54QT2), 56QT1(56QT2) and 59QT1(59QT2) thru 61QT1(61QT2). Center Tank - 35QT thru 38QT and 51QT.
**ON A/C ALL
Each probe is assembled in the same way. To make an allowance for the depth and size of the fuel tanks, the lengths of the probes are different.
**ON A/C 001-049, 051-061, 101-105, 201-203,
The probe has two concentric aluminium tubes which are anodized and covered with polyurethane. Sets of centralising pins are installed at different places along the length of the tubes. These keep the inner tube concentric with the outer tube. The open ends of the tubes let the fuel move freely up and down between the tubes.
The probes 21QT1(21QT2), 22QT1(22QT2) and 35QT thru 39QT have a mounting bracket at their lower end and a sleeve at their upper end. The mounting bracket is attached to the probe and does not move. The sleeve is free to move around the probe to include tolerance differences in the manufacture of the fuel tank.
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Typical Fuel Probe and Combined Fuel Probe and CIC Installation
Figure 007
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1201-299, 401-499, 1 Aug 01/05
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INTENTIONALLY BLANK
R 1 1
28-42-00Page 63
1 1 May 01/04 1 1 1CES 1
R FQI Probes - Detail
R Figure 007A (SHEET 1)
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1 1 May 01/04
1 1
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R FQI Probes - Detail
R Figure 007A (SHEET 2)
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1 1 May 01/04
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R FQI Probes - Detail
R Figure 007A (SHEET 3)
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The other probes have a mounting bracket at each end. The bottom bracket is attached to the probe and does not move. The top mounting bracket can move around the probe to include tolerance differences in the manufacture of the fuel tank. A terminal block is installed on the side of each probe to connect with the related tank harness. Shorting plug connectors are installed between the probes and the wing tank harnesses. (Ref. Fig. 008)
**ON A/C 301-399,
The probe has two concentric aluminium tubes which are anodized and covered with polyurethane. Sets of three teflon spacers are installed at different places along the length of the tubes. These keep the inner tube concentric with the outer tube. The open ends of the tubes let the fuel move freely up and down between the tubes.
The probes 21QT1(21QT2), 35QT thru 38QT, 51QT and 54QT1(54QT2) have a mounting bracket at their lower end and a sleeve at their upper end. The mounting bracket is attached to the probe and does not move. The sleeve is free to move around the probe to include tolerance differences in the manufacture of the fuel tank. The other probes have a mounting bracket at each end. The bottom bracket is attached to the probe and does not move. The top mounting bracket can move around the probe to include tolerance differences in the manufacture of the fuel tank. A terminal block is installed on the side of each probe to connect with the related tank harness.
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