Register

Parallel Runway Traps

When simultaneous instrument approaches are being conducted to parallel runways, ATC employs a no-transgression zone (NTZ) of variable dimensions to monitor and ensure proper separation, as depicted below. The FAA's Aeronautical Information Manual has lots more detail on the various ways NTZs are implemented, which aren't really relevant to VFR pattern operations at either towered or non-towered airports.
Gemini Sparkle

Key Takeaways:

  • Parallel runway configurations, particularly those with offset thresholds, are a significant yet often overlooked factor contributing to "Wrong-Surface Events" (WSEs) where aircraft land or depart on the incorrect runway.
  • WSEs occur frequently, often involving general aviation in daylight visual conditions, as tragically demonstrated by a recent fatal mid-air collision at North Las Vegas Airport where a pilot mistakenly lined up for the wrong parallel runway.
  • To mitigate these risks, pilots must thoroughly review airport layouts, actively listen to and read back ATC clearances, utilize electronic guidance for runway alignment, and maintain vigilant situational awareness to see and avoid other aircraft.
See a mistake? Contact us.

Airports and their runways come in all shapes and sizes, from turf strips lacking any real markings, but with trees at both ends, to massive, busy, complicated affairs like ATL, DFW, JFK or ORD. And pilots are expected to understand and comply with all procedures for operating at them, including taxiways and hotspots, runway intersections, LAHSO (land and hold short operations), and even soft-field takeoffs and landings on unpaved surfaces. As too many close calls involving runway incursions and near-misses remind us, sometimes things don’t go as planned.

A lot of the incursions and near-misses involve single- or crossing-runway events—and pilot error right alongside ATC mistakes. The industry’s conversation about these events is ongoing, but doesn’t often consider a common airport configuration: parallel runways. That’s too bad, especially since that configuration likely was a contributing factor in a recent fatal mid-air.

Ready to Sell Your Aircraft?

List your airplane on AircraftForSale.com and reach qualified buyers.

List Your Aircraft
AircraftForSale Logo | FLYING Logo
Pilot in aircraft
Sign-up for newsletters & special offers!

Get the latest stories & special offers delivered directly to your inbox.

SUBSCRIBE