At walking pace, a Boeing 777 still sweeps 65 meters of wing through everything in its path — including, on one recent taxi, a radar mast that ended up inside the cabin.
When the Turkish Airlines 777 struck the tower and was grounded, the instinct is to look for pilot error or procedural failure. The more durable question is simpler: why was that mast inside the aircraft's clearance envelope in the first place?
The geometry is unforgiving. ICAO Annex 14 mandates obstacle-free zones along taxiway centerlines, scaled by aircraft Code Letter — E for most widebodies, F for the A380 and 777X. Those standards define how far any fixed object must sit from the taxiway edge. But the keyword is current.
Infrastructure installed under older standards — radar masts, ILS arrays, nav aid equipment — was sized for narrowbodies. The 777's wingspan, ranging from 60.9 meters on Classic variants to 64.8 meters on the ER, didn't exist when many of those placements were engineered.
Legacy airports are full of these ghosts. Facilities built around 707s and 727s were later adapted for 747s, then for the twin-aisle proliferation of the 1990s. Each generation stretched the margins. Ground equipment migrated, or didn't. Taxiway geometry was redrawn on paper without always moving the hardware.
Taxi strikes are chronically under-investigated — and the classification system explains why. When a wingtip clips a mast on the ground, it's typically logged as a ramp incident rather than an accident, sitting below the threshold that triggers mandatory investigative intensity. Airborne events get black boxes and formal inquiries. Ground strikes get maintenance reports. And yet ramp incidents account for a disproportionate share of hull damage across the industry — a systemic risk managed at the level of paperwork rather than root cause.
The 777 didn't expose a flaw in airport design. It exposed how long that flaw had been waiting for an aircraft wide enough to find it.