Aviation English
MEL and CDL MEL and CDL

What is ADIRS-1 inoperative?

ADIRS-1 inoperative Primary ADIRS channel 1 failed; aircraft relying on remaining or standby navigation sources in accordance with MEL.

Source: ICAO Doc 9432, FAA PCG

How is “ADIRS-1 inoperative” Used in Practice?

Center, EAGLE 440, ADIRS-1 inoperative, request direct routing due degraded navigation.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related Aviation English Terms

Standby ADIRUinertial reference unitInertial Navigation SystemCompass deviation

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Frequently Asked Questions

What is ADIRS-1 inoperative?

Primary ADIRS channel 1 failed; aircraft relying on remaining or standby navigation sources in accordance with MEL.

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