US Airways A319 And A Cargolux B747 Had Only 100 Feet Vertical,
.33 Mile Lateral Separation
The NTSB has launched an investigation into the near midair
collision of a passenger jetliner and a cargo jumbo jet at
Anchorage International Airport (KANC).
On May 21, 2010, at about 0010 Alaska Daylight Savings Time, an
Airbus A319, operating as US Airways flight 140, and a Boeing
747-400, operating as Cargolux Airlines International flight 658,
came within an estimated 100 feet vertically and a .33 mile lateral
separation as the B747 was departing KANC, and the A319 was
executing go-around procedures at the airport.
The A319, with 138 passengers and crew aboard, was inbound from
Phoenix (KPHX) to runway 14 and the B747, with a crew of 2, was
departing Anchorage en route to Chicago (KORD) on runway 25R. The
incident occurred in night visual meteorological conditions with 10
miles of visibility.
According to the TCAS report from the A319 crew, that aircraft
was approaching ANC when, because of the effects of tailwinds on
the aircraft's approach path, the crew initiated a missed approach
and requested new instructions from air traffic control. The tower
controller instructed the A319 to turn right heading 300 and report
the departing B747 in sight. After the A319 crew reported the B747
in sight, the controller instructed the A319 to maintain visual
separation from the B747, climb to 3000 feet, and turn right
heading 320. The A319 crew refused the right turn because the turn
would have put their flight in direct conflict with the B747. The
A319 crew then received a resolution advisory to "monitor vertical
speed" and the crew complied with the descent command. During the
descent, the A319 crew lost sight of the B747. At about 1700 feet
above ground level, the A319 crew received a "clear of conflict"
There were no reported injuries or damage to either
NTSB investigator Dan Bartlett, an air traffic control
specialist based in Washington, will be traveling to Anchorage to
begin the investigation. A preliminary report of the incident will
be available on the Board's website within 10 business days.