How the Viavi/Aeroflex PSD90-1C Improves Aircraft Fuel System Accuracy for MROs

Accurate fuel measurement is not just a performance metric in aviation—it’s a safety requirement. Faulty or drifting fuel-capacitance readings can lead to incorrect fuel quantity indications, troubleshooting delays, deferred maintenance, and in worst cases, unnecessary Aircraft-on-Ground (AOG) situations. For MROs and avionics technicians, having a reliable and versatile test set to verify fuel probes, tank harnesses, and capacitance-based fuel quantity systems is essential.

This is where the Viavi/Aeroflex PSD90-1C Universal AC/DC Fuel Capacitance Test Set continues to prove its value.

The Importance of Fuel System Accuracy in MRO Operations

Capacitance-type fuel quantity systems are widely used in commercial and business aviation. These systems rely on precise electrical capacitance values generated by fuel tank probes and wiring harnesses. When issues arise—such as wiring degradation, connector resistance, probe drift, or system faults—technicians need a test platform that can simulate, measure, and validate capacitance behavior under real-world conditions.

Without proper verification, shops may experience:

• Misdiagnosed fuel-quantity system faults

• Longer troubleshooting cycles

• Repeat inspections or unnecessary component replacements

• Compliance challenges during audits

• Aircraft downtime impacting revenue and scheduling

A dedicated capacitance test set eliminates guesswork and restores confidence.

How the PSD90-1C Enhances Accuracy for MROs

The PSD90-1C delivers several practical benefits that MROs depend on:

1. Universal AC/DC Capacitance Simulation and Measurement

The unit supports both AC and DC excitation, allowing technicians to test a wide variety of aircraft fuel systems with one universal platform—no need for multiple test sets or adapters.

2. High-Precision Capacitance Validation

Designed for fuel-probe and harness testing, the PSD90-1C accurately measures capacitance values, enabling technicians to pinpoint drift, confirm probe integrity, or validate wiring behavior end-to-end.

3. Built for Certification and Compliance

When properly calibrated, the PSD90-1C provides traceable and repeatable measurements that support regulatory documentation needs—critical for both internal QA and external audits.

4. Faster Fault Isolation = Less Downtime

Technicians can simulate fuel-level capacitance behavior, validate probe outputs, and identify wiring or system issues without pulling aircraft parts prematurely. This results in:

• Shorter test cycles

• Fewer repeat inspections

• Less time spent swapping components

• Reduced risk of grounding an aircraft unnecessarily

5. Technician Adoption and Shop Efficiency

The platform’s clear readouts and simulation controls make it ideal for both experienced technicians and teams standardizing test procedures across shifts.

Refurbished or Rental: Flexible Deployment Options

Many MROs adopt the PSD90-1C not only as a primary test platform, but also as:

• A shop backup unit for redundancy

• A rental test set during peak maintenance windows

• A certified troubleshooting tool for avionics and fuel system specialists

With proper calibration and support, refurbished or rental units can deliver near-new reliability at a smarter capital cost.

Why MROs Continue to Trust This Platform

The PSD90-1C remains a respected workhorse in fuel-capacitance testing because it combines:

• Versatility (AC + DC support)

• Accuracy (precise capacitance measurement)

• Universal compatibility across fuel-quantity systems

• Faster technician adoption

• Proven reliability when sourced and serviced correctly

But one thing is equally important as the test set itself—the supplier behind it.

Need an PSD90-1C or other avionics test solutions?

AvionTEq is a trusted global supplier of aircraft and avionics test equipment, supporting MROs with:

• Refurbished test sets

• Universal test-equipment rental programs

• In-house and partner-lab repairs

• Pre-calibrated, certified, and ready-to-deploy units

• Trade-in credits toward upgraded platforms

• Worldwide logistics and compliance support

We don’t just deliver test equipment—we deliver confidence, compliance, and accuracy from day one.

Improve Your Fuel System Testing Capability in 2026

If your facility is looking to purchase, rent, or repair a Viavi/Aeroflex PSD90-1C, or you simply want to upgrade your fuel-system test capability, AvionTEq is ready to help.

Explore available inventory, rental, calibration & repair support at: www.AvionTEq.com

Empower your technicians with test equipment that reduces downtime, improves accuracy, and supports compliance without compromise.