AIRPLANES WITH SMITHS SUNBURST FUEL QUANTITY INDICATORS
Digital fuel quantity indicators show the weight of fuel in each fuel
tank. Each fuel quantity indicator has a single chip microcomputer
system and a digital liquid crystal display (LCD). The microcomputer
measures capacitive and resistive current in the tank units. The
microcomputer also monitors the leakage current and other circuit
parameters. When a parameter reaches an unacceptable level an error code
is shown on the indicator face. The display will show ERR plus an error
code between 0 and 10 which will be used to help in troubleshooting the
system. The subsequent define the error codes.
1 Normal Open or short in COMP LO-Z line
2 Zero Short in compensator unit (HI-Z to COMP LO-Z)
3 Normal Excessive compensator unit leakage
4 Zero Open or short in TANK LO-Z line
5 Zero Short in tank unit (HI-Z to TANK LO-Z)
6 Normal Excessive tank unit leakage
7 Calibration unit failure
8 Blank Error in DCTU data
9 Indicator memory failure
10 Zero Open or short in HI-Z line
If at the gate you have a steady ERR code 3 (3 as an example), what do you do?
If you know what the code means, use your common sense and snag it at the end of the flying day, if not, get an Engineer out to have a look.