I found this out for you Sprint.
Accident: United Airlines A319 at Newark on Jan 10th 2010, right main gear did not deploy
By Simon Hradecky, created Sunday, Jan 10th 2010 17:20Z, last updated Monday, Jan 11th 2010 07:46Z
N816UA on runway 04L
A United Airlines Airbus A319-100, registration N816UA performing flight UA-634 from Chicago O'Hare,IL to Newark,NJ (USA) with 48 passengers and 5 crew, aborted the approach to Newark's runway 04R when the crew received an unsafe indication for the right hand main gear. The airplane entered a holding for troubleshooting, performed a low approach to runway 11 for a visual inspection of the landing gear and subsequently landed on runway 04L without the right main gear being locked about 35 minutes after aborting the first approach. The airplane came to a stop on the left main and nose gear and the right hand engine, the passengers were evacuated via slides. No injuries occured.
United Airlines said, that the right hand main gear failed to deploy in full. Three passsengers reported very minor injuries but declined any medical treatment. The passenger ticket's will be refunded and the passengers are going to receive vouchers toward a future trip.
The FAA reported, that the right hand main gear did not extend.
The airport reported, that the airport was closed for about 20 minutes. The closure and the lack of one runway causes delays of up to 100 minutes.
Passengers reported, that the captain made an announcement some time after the go-around saying: "We are going to have an unusual landing." further explaining, they would have to land without one of the main gear struts. Upon final approach the crew ordered brace position and settled the airplane on the left hand main gear, nose gear and the right hand engine sending sparks, the airplane kept going straight until full stop. Smoke of unknown origin was observed, the evacuation was initiated.
Runway 04L/22R is currently still closed (Jan 11th 07:30Z).
http://flightaware.com/live/flight/UAL634/...1212Z/KORD/KEWRRelevant NOTAMs:
01/041 (A0066/10) - RWY 4L/22R CLSD. WIE UNTIL UFN. CREATED: 10 JAN 14:52 2010
01/045 - OBST CRANE 83 (65 AGL) AT ARP. WIE UNTIL UFN. CREATED: 11 JAN 00:22 2010
N816UA on runway 04L (Photo: AP/Kathy Willens):
Map (Courtesy Google Earth):
United Airlines A319 Accident At Newark...
Jan 11 2010, 08:26 PM
@ "smoke of an unknown origin", while I wasn't there...one can probably imagine aluminum to concrete friction at 150+ MPH being a likely factor 
