G. Ultracomp (50QT, 52QT)
(Ref. Fig. 010)
The ultracomp has:
-
a housing
-
a mounting plate
-
a parallel plate capacitor
-
a velocimeter
-an interconnecting board
-a temperature sensor. R The housing is installed on the mounting plate. The parallel plate R capacitor, the velocimeter and the temperature sensor are installed in
the housing and are connected to the interconnecting board. The interconnecting board has five threaded pins that connect the ultracomp to the related tank harnesses.
Fuel moves freely into and out of the ultracomp. The fuel acts as a
di-electric between the parallel plates of the capacitor. The FQIC R calculates the charge on plates, from which K, the relative permittivity R of the fuel, is calculated.
The velocimeter measures the Velocity Of Sound (VOS) through the fuel. The velocimeter transmits a sound wave through the fuel to a fixed target. The FQIC monitors the velocimeter and calculates the time taken for the sound wave to reach the target and return. The temperature sensor has an electrical resistor, the value of which changes in relation to the temperature of the adjacent fuel. The FQIC continuously monitors the resistance value and uses it to calculate the Temperature (T) of the fuel. The FQIC uses the values K, VOS and T to calculate the density of the fuel.
H. Dualcomp (53QT)
(Ref. Fig. 011)
The dualcomp has:
-
a housing
-
a mounting plate
-two parallel plate capacitors
-an interconnecting board.
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Ultracomp - Detail
Figure 010
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Dualcomp - Detail
Figure 011
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The housing is installed on the mounting plate. The two parallel plate capacitors are installed in the housing and are connected to the interconnecting board. The interconnecting board has two sets of three threaded pins, one set for each capacitor. The threaded pins connect the dualcomp to the related wing tank harnesses.
The fuel moves freely into and out of the dualcomp. The fuel acts as a di-electric between parallel plates of the capacitors. The FQIC calculates the charge on the plates, from which K, the relative permittivity of the fuel is calculated. The FQIC uses the value K with the VOS and T values from the ultracomp in the opposite wing tank to calculate the density of the fuel.
**ON A/C 001-049, 051-061, 101-105, 201-203, 301-399,
J. FQI Probe Shorting Plug Connectors 4041VC-A (4042VC-A) and 4043VC-A (4044VC-A) (Ref. Fig. 008)
Shorting plug connectors are installed between the external wiring harness and the in-tank wiring harness at the false spar, zone 574 (674). They are used to connect the external wiring harness to the in-tank wiring harness. The shorting plug connector has a different pin configuration to a fused plug connector. This is to make sure that only a shorting plug can be installed into the shorting plug connector receptacle.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Post SB 28-1087 For A/C 001-049,051-061,101-105,201-203,
J. FQI Probe Fused Plug Connectors 4041VC-A (4042VC-A) and 4043VC-A (4044VC-A) (Ref. Fig. 008A)
Fused plug connectors are installed between the external wiring harness and the in-tank wiring harness at the false spar, zone 574 (674). They are used to connect the external wiring harness to the in-tank wiring harness. The fuses are used to prevent short circuits between the FQIS system cables and the 28V supply cable. This decreases the risk of the in-tank components to become too hot. The fused plug connector has a different pin configuration to a shorting plug connector. This is to make sure that only a fused plug can be installed into the fused plug connector receptacle.
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