NTSB Identification: DEN07IA069.
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Scheduled 14 CFR operation of Frontier Airlines
Incident occurred Friday, February 16, 2007 in Denver, CO
Probable Cause Approval Date: 06/27/2007
Aircraft: Airbus Industrie A319-111, registration: N927FR
Injuries: 5 Uninjured.

NTSB investigators used data provided by various sources and may have traveled in support of this investigation to prepare this aircraft incident report.

According to the captain, the airplane had just departed and was making a turn to a heading of 270 degrees when they noticed the first officer's windshield cracking and beginning to arc. The captain alerted Air Traffic Control that they were returning to the airport and noticed that his windshield was also cracking, but not arcing. The first officer's windscreen stopped arcing and the flight crew landed the airplane without further incident. During the course of the afternoon, 14 airplanes experienced 26 fractured windshields. One flight crew reported that during the landing roll they "heard a loud thump" and observed the first officer's window "spider web." They did not observe anything impacting the windscreen. Another flight crew reported taxiing through "dirt and dust being blown around." Examination of the windshields revealed that the impact markings on all 26 windshields were the result of impact with foreign object debris (FOD). No pre-impact anomalies were noted with any of the windshields. Winds at the time of the event were reported as 280 degrees to 030 degrees with sustained winds between 28 and 36 knots. Wind gusts as high as 44 knots were recorded.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

Fracturing of the aircraft windscreens due to impact with foreign object debris. Contributing to the event was the high, gusty surface winds.

Full narrative available

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