Product

Aircraft Configurable Signal Conditioner Unit (SCU)

The Essential Link Between Your Fuel Probes and Cockpit

The Aircraft Signal Conditioner Unit (SCU) plays a vital role in your aircraft’s fuel management system. It acts as the brain of the system, processing signals from your fuel quantity probes and transmitting accurate fuel level data to the cockpit.

The LMS Configurable Aircraft Signal Conditioner Unit is a revolutionary solution designed to meet the needs of modern aviation. This innovative SCU offers unparalleled flexibility and control, empowering you to customize a fuel management system that perfectly aligns with your specific requirements.

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Product Benefits

Accurate Fuel Measurement

Processes signals from LMS fuel probes (and compatible compensators) to deliver precise fuel quantity data for each tank.

Multi-Probe Capability

Each SCU can handle up to twelve (12) fuel probes with temperature detection, ensuring comprehensive fuel level monitoring.

Advanced Signal Processing

Features built-in slosh filtering to eliminate false readings caused by fuel movement, ensuring accurate data even in turbulent conditions.

High-Level and Low-Level Detection

Provides critical alerts for low fuel or overfill situations, enhancing safety and operational efficiency.

Built-in Diagnostics

Features Startup and Continuous Built-In-Test (SBIT and CBIT) for continuous health monitoring of the unit.

Increased Channel Capacity

Accommodate a larger number of fuel probes compared to a standard SCU, ideal for complex fuel systems with numerous tanks.

Potential for Improved Accuracy

The modular design allows for the integration of advanced processing capabilities that may contribute to even more precise fuel level readings.

Sustainable Design

Built with obsolescence mitigation strategies, ensuring long-term availability of components and minimizing future maintenance challenges.

For applications with less complex fuel systems, we also offer lighter and smaller SCU solutions with reduced functionality.

Technical Specifications

Accuracy

Achieves Class III accuracy as per MIL-G-26988C (±1% indication, ±0.5% full scale) – Requires a densitometer for optimal performance.
Offers compatibility with MIL-G-26988C Class I, II, and III accuracy standards depending on your specific requirements.
Compensator compatibility ensures accurate readings with various fuel types.

Processing Power

Processes signals from up to 12 probes and sensors simultaneously, ideal for complex fuel systems with numerous tanks.
Reduces the number of SCUs required per aircraft, simplifying integration and minimizing weight.

Advanced Functionality

Safety Features: Detects fuel imbalance and offers DO-160 Level 4 lightning protection for enhanced operational safety.
Reliability Features: Includes Startup, Continuous, and Initiated Built-In-Test (SBIT, CBIT, IBIT) for continuous health monitoring and fault detection.
Operational Fault Management: Minimizes common mode failures, improving overall system availability.
Standard Features: Provides fuel temperature measurement, slosh filtering, high and low-level detection, and eliminates the need for field calibration when used with LMS probes and sensors.

Physical Specifications

Enclosure:
- Dimensions: 6.4” x 6.3” x 2.7” (16.3cm x 16.0cm x 6.9cm) – Compact design for easy integration.
- Weight: Approximately 2 lbs (0.9kg) – Lightweight construction minimizes overall weight.
- Material: Nickel plated aluminum for durability and EMI shielding.
Connectors: Utilizes D38999 series connectors for reliable signal transmission.

Inputs/Output

Inputs
- Supports up to 12 probes/sensors and 12 temperature sensors, reducing the number of SCUs needed.
- Capable of selecting up to eight (8) different tank configurations for versatility.
- Features additional inputs for ARINC 429 data reception, discrete signals, and 28VDC power.
Outputs
- Offers up to two ARINC 429 data buses for seamless communication with modern avionics systems.
- Provides two 0-10V analog outputs for interfacing with various display units.
- Includes eight discrete outputs for customized alerts and functionalities.
- Supports customer-specific output requirements for tailored integration.

Power

Operates on 28VDC power supply as per MIL-STD-704.
Maintains low power consumption with a current draw of less than 100mA and a maximum power consumption of 7W.

Technical Information

No.	Section and Description	Category
4	Temperature & Altitude	B2
5	Temperature Variation	A
6	Humidity	B
7	Operational Shocks and Crash Safety	B
8	Vibration	S (Curve T) R (Curve G)
9	Explosive Atmosphere	E
10	Waterproofness	W
11	Fluids Susceptibility	F
12	Sand and Dust	S
13	Fungus Resistance	F
14	Salt Fog	S
15	Magnetic Effect	Z
16	Power Input	ZXX
17	Voltage Spike	A
18	Audio Frequency Conducted Susceptibility	Z
19	Induced Signal Susceptibility	ZCX
20	Radio Frequency Susceptibility (Radiated and Conducted)	R
21	Emission of Radio Frequency Energy	M
22	Lightning Induced Transient Susceptibility	A3J3L3
23	Lightning Direct Effects	X
24	Icing	A
25	Electrostatic Discharge (ESD)	A
26	Fire, Flammability	C

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Contact us today to discuss your specific requirements and learn more about how our solutions can help you achieve optimal aircraft performance.