The Gulfstream G-280 Fuel Quantity test box speeds diagnosing failed Capacitance Probes, and wire harness failures.
- Each of the LOW-Z selection test switches connects the Barfield LOW-Z to the specific probe.
- The switch is labeled with the AMM Nomenclature for the probe, (10Q OUTER RT #1), as well as the IPC long part number for that probe (P/N 765931-1-0).
- Additionally, the allowable capacitance range is labeled (45.20 to 50.00). The final label is the associated HI-Z (Hi-Z RT OUTER). The arrow points to the installation position in the wing, with the number of the closest fuel panel access door (10Q is closest to RH DOOR #6.)
- The test box cables access the FQMC, located in the aft RH avionics closet.
- This allows evaluation of the entire 400HZ capacitance wiring, from the probes, to the wing disconnects, right through the fuselage harness.
