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Improved Aircraft Signal Conditioner Unit


  • Delivers Class III accuracy
  • Processes signals from up to 12 probes/sensors
  • Capacity for up to 8 different tank configurations
  • All in one signal conditioning unit


  • Dimensions: 6.4”x 6.3”x 2.7” (16.3cm x 16.0cm x 6.9cm)
  • Weight: Approx 2 lbs (0.9kg)
  • Connectors: D38999/26SC35SN, D38999/26SD35SA, D38999/26SE35SN, D38999/26SD35SN
  • Material: Nickel plated aluminum


  • Safety
    • Detect Fuel Imbalance
    • DO-160 Level 4 Lightning Protection
  • Reliability:
    • Startup, Continuous, and Initiated Built-In-Test (SBIT, CBIT, IBIT)
    • Increased Operational Availability via Operational Fault Management (Reduced Common Mode Failures)
  • Fuel temperature measurement
  • No field calibration required when paired with LMS probes and sensors
  • Slosh filtering
  • High and Low-Level detection

System Accuracy

  • MIL-G-26988C Class III (±1% indication, ±0.5% full scale)
    • Densitometer Required
    • No Compensator Required for One Fuel Type
    • Compensator Required for Multiple Fuel Types
  • MIL-G-26988C Class II (±2% indication, ±0.75% full scale)
    • No Compensator Required for One Fuel Type
    • Compensator Required for Multiple Fuel Types
  • MIL-G-26988C Class I (±4% indication, ±2% full scale)
    • No Compensator Required for Multiple Fuel Types

Operational Temp. Range

  • -55° C to +75° C


  • One SCU can excite and monitor up to twelve (12) fuel probes or compensators and up to twelve (12) temperature sensors (Reduces number of SCU’s per Aircraft)
  • Select up to Eight (8) different tank configurations
  • Up to One (1) ARINC 429 receive only data busses
  • 8 discrete inputs (4 open/gnd, 4 open/28V)
  • Input: 28VDC


  • Up to two (2) ARINC 429 transmit/receive data busses
  • Two 0-10V analog outputs
  • Up to 8 discrete outputs
  • Customer Specific Requirement

Power Requirements

  • Input: 28VDC per MIL-STD-704
  • Current Draw: < 100mA
  • Maximum Power Consumption: 7W
DO-160GSection and DescriptionCategory
4Temperature & AltitudeB2
5Temperature VariationA
7Operational Shocks and Crash SafetyB
8VibrationS (Curve T)
R (Curve G)
9Explosive AtmosphereE
11Fluids SusceptibilityF
12Sand and DustS
13Fungus ResistanceF
14Salt FogS
15Magnetic EffectY
16Power InputZXX
17Voltage SpikeA
18Audio Frequency Conducted SusceptibilityZ
19Induced Signal SusceptibilityZCX
20Radio Frequency Susceptibility (Radiated and Conducted)R
Emission of Radio Frequency EnergyM
22Lightning Induced Transient SusceptibilityA4J4L4
23Lightning Direct EffectsX
25Electrostatic Discharge (ESD)A
26Fire, FlammabilityC

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