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Aircraft External Refuel Preselect Panel


Liquid Measurement Systems (LMS) provides fuel gauging and interface controls for service, maintenance, and flight crew personnel, at the primary refuel point on the aircraft.

External Refuel Preselect Panels can display the quantity of fuel in each tank, calculate the total quantity of fuel onboard, allow service teams to pre-select desired fuel quantity, and display fault codes. LMS’ external refuel preselect panels are compact, lightweight, and rugged systems that can be adapted to a variety of platforms.


  • Material: Nickel plated aluminum
  • Dimensions: 5.06″ x 5.37″ x 3.36″
  • Weight 1.20 pounds maximum
  • Mil-STD-38999, shell size 13, 22 pins, environmentally sealed


  • Receives fuel quantities from two separate ARINC 429 buses
  • Certified to FAA TSO C55A
  • Software DO-178
  • Environmental DO-160
  • Capable of driving shutoff valves open and closed to enable automatic refueling


  • Start/Off toggle switch
  • Increment/decrement toggle switch used to preselect the desired total fuel quantity

Operational Temp. Range

  • -55° C to +75° C


  • Up to Five (5) Open/28VDC discrete inputs
  • One (1) Open/GND discrete input
  • ARINC 429 or customer specific requirement


  • Up to Two (2) Discrete Open/GND
  • Displays several tank quantities and calculates the total quantity
  • Displays preselected fuel quantity
  • Displays fault codes

Power Requirements

  • 28VDC
  • Current Draw: < 150mA
  • Maximum Power Consumption: 4W


Section and DescriptionCategory
1Temperature & AltitudeB2
2Temperature VariationA
4Operational Shocks and Crash SafetyB
5VibrationS (Curve T)
6Explosive AtmosphereE
8Fluids SusceptibilityF (Spray)
9Sand and DustD
10Fungus ResistanceF
11Salt FogS
12Magnetic EffectA
13Power InputZ(XX)
14Voltage SpikeA
15Audio Frequency Conducted SusceptibilityZ
16Induced Signal SusceptibilityZCX
17Radio Frequency Susceptibility (Radiated and Conducted)TT
18Emission of Radio Frequency EnergyM
19Lightning Induced Transient SusceptibilityA3J3L3
20Lightning Direct EffectsXXXX
22Electrostatic Discharge (ESD)A
23Fire, FlammabilityC

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