20110408009569I

Incident · No damage

FAA incident report · Boeing 737-7H4 · Frisco, TX · April 8, 2011

Date: April 8, 2011 · 16:07 local
Place: Frisco, TX
Phase of flight: Cruise/Level Flight
Operating rules: Air carrier (Part 121)
Operator: SWAA
Damage: No damage
Aircraft: N934WN
Reported as: Boeing 737-7H4
Reported engine: CFM International CFM56-7B24/3
People aboard: 139
Fatal injuries: 0
Other injuries: 0

N934WNRegistration cancelled Jul 25, 2025 · Boeing 737-7H4S/N 36642 · Built 2009 Airframe modelBoeing 737-7H4 Engine modelCFM International CFM56-7B24/3 seriesTurbo-fan

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

TCAS resolution advisory (ra) and loss of separation due to TCAS climb command. N56RB, a VFR MO20, was southeast bound at an assigned altitude of 3,500 feet. SWA367, a B-737, was south bound at 4,000 feet. SWA367 was issued traffic and reported N56RB in sight. The mode c for N56RB was indicating 3,600 feet. SWA367 received a TCAS alert on N56RB and climbed to 4,300 feet. Traffic was AAL81, a B-777, which was passing above and in front of SWA367 at 5,000 feet. As SWA367 climbed, he entered the wake remnant from AAL81, resulting in a loss of separation. Closest proximity was 0.73 lateral and 800 feet vertical.

As the FAA filed it

TCAS RESOLUTION ADVISORY (RA) AND LOSS OF SEPARATION DUE TO TCAS CLIMB COMMAND. N56RB, A VFR MO20, WAS SOUTHEAST BOUND AT AN ASSIGNED ALTITUDE OF 3,500 FEET. SWA367, A B-737, WAS SOUTH BOUND AT 4,000 FEET. SWA367 WAS ISSUED TRAFFIC AND REPORTED N56RB IN SIGHT. THE MODE C FOR N56RB WAS INDICATING 3,600 FEET. SWA367 RECEIVED A TCAS ALERT ON N56RB AND CLIMBED TO 4,300 FEET. TRAFFIC WAS AAL81, A B-777, WHICH WAS PASSING ABOVE AND IN FRONT OF SWA367 AT 5,000 FEET. AS SWA367 CLIMBED, HE ENTERED THE WAKE REMNANT FROM AAL81, RESULTING IN A LOSS OF SEPARATION. CLOSEST PROXIMITY WAS 0.73 LATERAL AND 800 FEET VERTICAL.