Supply Chain & Manufacturing Challenges   Aircraft Manufacturing (OEMs)  

UAC puts modified flap arrangement for import-substituted MC-21-310 through tests

United Aircraft says it is testing a revised flap system for the MC-21-310 developed during import substitution. The inboard and outboard flaps are designed to converge when extended for takeoff and landing, but UAC says a cruise-flight “gap” remains, creating airflow leakage that must be managed.

Discovered 2026-04-16T02:09:21.456290-07:00 | 2026-04-16T02:09:21.456290-07:00

Briefing

What Hype is tracking

  • Controls and airflow around the flaps are core to approach, landing and potentially high-lift performance; the disclosed “gap” and resulting leakage on the MC-21-310’s flap design raise practical certification and performance-verification questions.
  • The modification is explicitly tied to import-substitution engineering, underscoring how supply-chain-driven redesigns are propagating into aerodynamic hardware that must be re-tested and revalidated (see related MC-21 import-substitution progress claims: source:5eeff008-40cf-4ef7-91b5-0262f32bcceb).
  • For airlines and lessors planning fleets around the MC-21 schedule, this is a signal that airframe configuration changes—beyond engine and systems—are still in active development during the aircraft’s rollout to operators.

Reported By

ruavia.su aerotelegraph.com FlightGlobal
Sources Tracked
3
First Seen
2026-04-16T02:09:21.456290-07:00
Latest Update
2026-04-18T14:30:48.169700-07:00
Coverage
Aviation

Sources

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