Mdyd583avi 2021 [best] -

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1. Preflight: Crew reported intermittent navigation‑display instabilities and an unresolved advisory regarding inertial reference alignment. Maintenance deferred corrective action with a Minimum Equipment List (MEL) entry permitting dispatch.
2. Taxi and takeoff: During initial climb, crew observed conflicting attitude indications between standby instruments and primary PFDs; autopilot engaged then disengaged with an aural warning.
3. Enroute: The aircraft deviated laterally while the autopilot attempted to capture the published airway; TCAS issued a TA for a nearby traffic, increasing crew workload. FMS position updates lagged and required manual cross‑checks with radio navigation.
4. Descent and approach: Crew executed a non‑precision approach using raw data guidance because vertical navigation path data had been flagged unreliable by the FMS. A stabilized approach was not achieved; a go‑around was performed after late runway visual acquisition.
5. Postflight: Maintenance inspection found intermittent data bus errors, one pitot‑static discrepancy, and a degraded Inertial Reference Unit (IRU). Records showed recurring fault codes dating months prior.

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