Aircraft Squib Tester – Indigenized Squib & Igniter Circuit Testing System

Jetsys Defence presents an indigenously developed Squib Tester designed for safe testing of electro-explosive devices used in aircraft and defence systems. This advanced tester measures continuity, firing circuit integrity, and resistance values without intentionally initiating the device, supporting safer maintenance and system checks.

Built for military and commercial aviation fleets, our Squib Tester provides precise diagnostics for mission-critical systems such as ejection seats, countermeasure deployment, rocket ignition sequences, fire suppression bottles, airbag triggers, and explosive bolts.

What Is Squib Testing?

A squib is a small electrically initiated device, also called an electro-explosive device (EED). When a firing current passes through it, the squib sets off a cartridge or igniter. On aircraft and defence systems, squibs are used in ejection seats, canopy severance devices, fire bottle cartridges, and flare or countermeasure dispensers.

Squib testing is the electrical check of the squib and its firing circuit. It confirms continuity, measures resistance, and looks for wiring faults or stray voltage, using a test current kept below the level needed to fire the device. This lets maintenance teams verify the circuit without initiating the squib.

What is a Squib Tester?

A Squib Tester (also known as an Aircraft Squib Tester, Squib Igniter Tester, or Squib Firing Circuit Tester) is an electronic instrument used to verify the electrical health of explosive components without intentionally firing them. It applies a controlled, current-limited test current—below the firing threshold—to measure resistance, continuity, and wiring faults.

Why Squib Testing Is Critical

Helps confirm that the firing circuits of ejection seats, explosive valves, and deployment systems are electrically intact
Reduces the risk of unintended initiation during maintenance
Detects broken wiring, incorrect harness routing, stray voltages, and degraded igniters
Helps find circuit faults before they affect aircraft or crew safety
Supports defence readiness and lifecycle reliability

Key Features of Jetsys Defence Squib Tester

Current-Limited Testing Test current is limited below the firing threshold during checks.
Current-Limited Testing Fail-safe current limiting reduces the risk of unintended initiation while measuring.
High-Accuracy Measurement Precision micro-ohm resistance readings for reliable diagnostics.
High-Accuracy Measurement Detects short/open circuits, leakage, and stray voltage conditions.
Rugged Design Rugged, shock-resistant housing suited for field and workshop use.
Rugged Design Compatible with major aircraft platforms and EED families.

High-Accuracy Measurement Instant, stable readings on a large, easy-to-read digital display.
Rugged Design Portable, battery-operated configuration ideal for flightline operations.
Operator-Friendly Single-person operation for quick turnarounds.
Operator-Friendly 4-wire (Kelvin) test lead configuration for precise low-resistance tests.
Operator-Friendly Digital calibration and automation support to streamline procedures.
Operator-Friendly Optional data logging for maintenance records and traceability.

Technical Specifications – Squib Tester

Parameter	Specification
Measurement Range	Micro-ohm to low-ohm range (model-dependent)
Test Current	Safe micro-current level, below ignition threshold
Accuracy	High-precision digital measurement
Display	High-visibility LCD/OLED display
Lead Configuration	4-wire Kelvin sensing
Power	Rechargeable battery or external DC
Safety	Fail-safe current limiting & redundant protection
Data Storage	Local logging / USB export (optional)
Operating Temperature	–20°C to +50°C
Use Case Compatibility	Squibs, igniters, explosive bolts, fire suppression cartridges, airbag initiators

Squib Tester Applications

Aircraft Safety Systems Used for ejection seats to ensure reliable ignition during emergency deployment.
Aircraft Safety Systems Validates canopy severance devices for safe pilot exit operations.
Aircraft Safety Systems Checks emergency fire bottle squib cartridges to ensure rapid discharge.
Aircraft Safety Systems Used for flare and countermeasure deployment verification.
Rocket & Missile Systems Performs igniter circuit continuity and resistance checks.
Rocket & Missile Systems Validates stage-separation charges for mission-critical sequencing.

Rocket & Missile Systems Tests safety and arming circuits for correct electrical parameters.
Maintenance & Diagnostics Used for continuity and firing-circuit validation in on-ground inspections.
Maintenance & Diagnostics Supports pre-flight and post-storage safety inspections.
Maintenance & Diagnostics Essential for depot-level electrical testing of explosive devices.
Defence & Aerospace Manufacturing Ensures production quality assurance for squibs and cartridges.
Defence & Aerospace Manufacturing Used for acceptance testing and periodic verification.

Why Use a Dedicated Squib Tester?

Enhanced System Safety Verifies electrical continuity and firing integrity to reduce risks of accidental misfires.
Non-Destructive Testing Allows circuit diagnostics without intentionally firing the squib, so checks can be repeated.
Accurate Fault Detection Identifies wiring faults, high resistance, stray voltage, or defective cartridges before activation.
Pre-Flight Assurance Helps confirm the firing circuits of systems like ejection seats, canopy severance, fire bottles, and igniters are electrically serviceable.

Portable & Field-Ready Technicians can test directly on aircraft or at remote maintenance locations.
Wide Compatibility Works with squibs, igniters, explosive bolts, pyrotechnic cartridges, and multiple aircraft platforms.
Reduced Downtime Rapid diagnostics improve fleet readiness and maintenance efficiency.
Procedure Support Suited to squib circuit checks carried out under OEM maintenance procedures.

Why Choose the Jetsys Defence Squib Tester

100% Indigenous Design Engineered and manufactured in India, supporting strategic self-reliance.
Full Local Support Spare parts, repair, and calibration services available within India for faster turnaround.
Multi-Aircraft Compatibility Works with diverse aircraft platforms and igniter families across defence fleets.

Rugged and Reliable Operational in harsh climates, rough field environments, and high-vibration conditions.
Custom-Built Variants Available with multi-channel support, rack-mount configurations, and rugged field deployments.

Frequently Asked Questions

What is a squib tester?

A squib tester is an electronic instrument that checks the electrical condition of squibs, igniters, and their firing circuits. It measures continuity and resistance with a current-limited test, without intentionally firing the device.

What is squib testing in aircraft?

It is the maintenance check of the squib firing circuits on an aircraft, such as those for ejection seats, canopy severance, fire bottles, and countermeasure dispensers. The aim is to confirm each circuit is intact and within its expected resistance before the aircraft is released.

What does a squib tester measure?

The Jetsys Defence Squib Tester measures circuit continuity and low resistance values using 4-wire Kelvin sensing, and detects open circuits, short circuits, leakage, and stray voltage.

Where are aircraft squibs used?

Squibs are used in ejection seats, canopy severance devices, emergency fire bottle cartridges, and flare and countermeasure deployment. In rocket and missile systems they are used in igniter and stage-separation circuits.

Why is squib circuit testing required?

These systems must work the first time they are needed and cannot be function-tested by firing them. Circuit testing finds broken wiring, high resistance, and stray voltage during routine maintenance, before they can cause a failure to fire or an unintended initiation.

The Squib Tester is part of our range of indigenized defence equipment. For aircraft system checks, see our ground test equipment, or contact our team to discuss your requirement.