MRO (Maintenance, Repair & Overhaul) Aircraft Manufacturing (OEMs) Aviation Safety & Regulation Airlines Boeing United Airlines

United’s new 787-9s remain grounded as TCAS antenna issues persist despite Boeing fixes

United’s newest premium-heavy Boeing 787-9 Dreamliner has reportedly been grounded again after Traffic Alert and Collision Avoidance System (TCAS) problems, including antenna-related failures. The aircraft was previously sent back to Boeing, but further TCAS issues were reported. Meanwhile, Air New Zealand says all its 787s are now ungrounded and available without restriction.

Discovered 2026-07-04T00:59:05.508146-07:00 | 2026-07-04T00:59:05.508146-07:00

Briefing

What Hype is tracking

Persistent TCAS antenna/TCAS failures keep a newly delivered United 787-9 out of service, creating direct schedule, reliability, and acceptance risk for premium widebody deployments.
The reports describe a cycle of grounding, return to Boeing, and continued issues—highlighting how long-running avionics fixes can affect delivery timelines and fleet readiness.
Air New Zealand’s reported resolution—its 787s ungrounded after years—sets a timely benchmark for how quickly similar aircraft can return to unrestricted operation, informing grounding-to-service assumptions across operators.

Reported By

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