Avionics Technician how-to

How to Troubleshoot an Intermittent Avionics Fault

Intermittent faults require patience and a methodical approach.

Updated By the Career Education Institute Curriculum Team
Quick answer

Intermittent faults require patience and a methodical approach. In short: interview; try; check, then complete the remaining steps below.

Step by step

  1. Interview the pilot and review the fault history.

  2. Try to reproduce the fault on the ground.

  3. Check connectors and grounds for corrosion or looseness.

  4. Use wiring diagrams to plan tests.

  5. Wiggle-test harnesses while monitoring the system.

  6. Repair, test thoroughly and document.

Safety reminders for avionics technicians

  • Follow ESD procedures when handling electronics
  • De-energize circuits and verify before working
  • Use proper ladders and stands around aircraft
  • Follow hangar safety rules around moving aircraft and engines

Avionics · ADS-B · Transponder · Autopilot · Pitot-static system · Wiring harness: see the full avionics technician glossary.

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