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BRUSSELS (AP) — It was the end of a long-haul passenger flight from Newark, N.J., and the LOT Polish Airlines Boeing 767 was about to land in Warsaw.
But the pilots had a problem: The plane’s hydraulic system had failed a half-hour into the flight. Now the landing gear would not deploy. None of it — not the nose gear or the wheel assemblies under the wings.
With 231 people aboard a wheelless aircraft weighing nearly 90 tons, what’s a pilot to do?
The answer: Do everything exactly as you would if you were landing with the gear down — only make sure you execute to perfection.
That is just what LOT Capt. Tadeusz Wrona appears to have done Tuesday, according to pilots who have flown this type of plane.
Not only did Mr. Wrona prevent any injuries to passengers and crew, but he landed the aircraft on its belly so smoothly that many on board thought it had landed on its wheels. The plane apparently suffered no structural damage.
“This was a testament to the crew’s training, professionalism and preparedness, (but) from a pilot’s perspective, for most intents and purposes you’re making a normal landing until the plane actually touches the runway,” said Patrick Smith, a Boston-based airline pilot who flies a Boeing 767-300, the same type involved in Tuesday’s incident.
A failure to deploy of all three sections of the undercarriage — the nose gear and the two main underwing gears — is rare but not unheard of in civil aviation.
There have been several incidents in the past decade where one of the assemblies could not be lowered. But in 2008, a Boeing 737 executed a belly landing at the Kaliningrad airport in Russia after it suffered a total undercarriage failure. There were no casualties among the 144 passengers and crew, but in that case the aircraft sustained serious damage.
On the 767 in Tuesday’s incident, the main hydraulic system handles the retraction and extension of the undercarriage, while electric motors control the opening and closing of the gear doors. For the main and nose gears to have failed to lower, either or both may have malfunctioned, in addition to a manual backup system that relies on gravity.
Normally when only one of the gears fails to deploy, the pilots will try to keep the plane balanced on the other two after touching down, while waiting for the speed to fall off. This allows them to keep directional control until almost the very end of the landing roll. But that was not an option for Mr. Wrona, meaning he would be incapable of affecting the plane’s direction after it set down on the tarmac.
LOT said the plane suffered “a central hydraulic system failure” about a half-hour after leaving Newark. The decision was made to continue to Warsaw's Frederic Chopin Airport, apparently in order to use up the heavy fuel load supplied for the trans-Atlantic flight. The 767 can dump fuel only from its central tank, with no such possibility for the wing tanks; the pilots likely would have been concerned about a possible fire breaking out if they landed with too much fuel still on board.
Rare as total undercarriage failure is, pilots regularly train on simulators to execute this emergency procedure.
Air traffic control services also prepare for such landings, giving absolute priority to the flight, dispatching the fire brigade and medical services and foaming the runway to prevent a fire. Those procedures are universal, set by the U.N. civil aviation organization.
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