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In the aerospace and defense industries, maximizing safety and functionality is critical. Pyrotechnic devices are integral components of aircraft systems, so they must work regardless of how long they’ve been dormant. A single dud in an ejection seat or fire suppression system can be catastrophic for aircraft integrity and human safety. Integrity testing for pyrotechnic devices helps manufacturers and engineers validate the safety of aircraft components and protect against defects in mission-critical applications.

Why Integrity Testing Is Critical for Safety Certification of Aircraft Devices

Integrity testing is integral in aviation for its:

  • High-stakes application: Unlike mechanical parts, pyrotechnics cannot be test-fired before use, so these components have only one chance to work properly.
  • Risk mitigation: Integrity testing identifies latent defects that would otherwise lead to inadvertent firing or a dud. Some of these defects can include moisture ingress, bridge-wire corrosion and propellant degradation.
  • Reliability metrics: Cartridge-actuated device reliability is the primary metric for procurement.
  • Life cycle assurance: Integrity testing validates performance not just at manufacture, but throughout the component’s certified service life.

Types of Detonator and Initiator Testing for Integrity

Three key aspects of integrity testing for pyrotechnic devices include:

  • Electrical and ignition integrity: Integrity testing includes bridgewire resistance checks and insulation resistance testing to prevent short circuits.
  • Mechanical testing: Mechanical tests such as vibration and shock testing simulate the extreme G-forces of launch and flight to ensure the device’s structure remains intact.
  • Environmental extremes: Aircraft experience harsh conditions in flights, so pyrotechnics need to be tested to prove they can withstand these operational environments. These tests include thermal cycling, humidity exposure and salt fog testing.

Nondestructive vs. Destructive Testing Methods

Integrity testing can involve both destructive and nondestructive testing methods. Using a combination of both in aircraft pyrotechnic testing is the best approach for confidence in the quality of the product.

One type of destructive testing is lot acceptance testing (LAT). During LAT, a statistical sample of the product is fired to verify batch performance. In nondestructive testing, all units are inspected without damage using techniques like helium leak testing and X-rays.

How Manufacturers Document and Certify Results

After a component has been tested, manufacturers include Certificates of Conformance and Lot Acceptance Reports in every shipment to establish traceability. These documents also establish regulatory compliance with:

  • Department of Defense standards.
  • International Traffic in Arms Regulations.
  • The Federal Aviation Administration.
  • OEM requirements.
  • The Bureau of Alcohol, Tobacco, Firearms and Explosives.

Procurement managers can use documentation as auditable proof of quality and have transparency into manufacturing practices.

Contact Applied Energy Today

Applied Energy supports aircraft for military and commercial operations through high-quality components and custom solutions. Learn more about our pyrotechnic components by contacting us online or calling 1-979-347-2324 today.