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ASN Wikibase Occurrence # 43643
Last updated: 14 November 2021
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Date:23-OCT-2007
Time:22:12
Type:Silhouette image of generic PA44 model; specific model in this crash may look slightly different
Piper PA-44-180
Owner/operator:University Of North Dakota
Registration: N327ND
MSN: 4496174
Fatalities:Fatalities: 2 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Browerville, MN -   United States of America
Phase: En route
Nature:Training
Departure airport:St Paul, MN (STP)
Destination airport:Grand Forks, ND (GFK)
Investigating agency: NTSB
Narrative:
The accident flight was the third of a three-leg dual instructional night cross-country flight. The airplane was established in normal cruise flight at 4,500 feet mean sea level (msl) when the airplane abruptly departed controlled flight and impacted a bog. The bog was about 15 to 20 feet deep, with a thin layer of vegetation floating on the surface. The airplane came to rest inverted, and damage to the airframe was consistent with an inverted impact to the surface of the bog. Data recovered from the airplane's flight display system indicated that the airplane was in stable flight on a 320-degree magnetic heading, at 4,500 feet msl, and approximately 160 knots true airspeed prior to the accident, when it abruptly departed from controlled flight. The airplane rolled approximately 20 degrees left wing down, yawed to the left about 30 degrees, and simultaneously pitched nose-down about 40 degrees. It then reversed and immediately entered a descending, right roll for the duration of the flight. The airplane impacted the bog within 30 seconds of the upset. The post accident examination noted that the left half of the horizontal stabilator was bent upward approximately 90 degrees, inconsistent with the damage to the remainder of the airframe. This damage was consistent with the initial left yaw and nose down pitch recorded during the upset. In addition, a depression and tear were observed on the upper wing skin near the left wing tip. Microscopic examination and DNA testing of material on the inside surface of the wing skin was identified as remains of a Canada goose. The natural history of this species was consistent with the location, time, and date of the accident.
Probable Cause: An in-flight collision with at least one Canada goose, and the resulting damage to the left stabilator that caused the airplane to become uncontrollable. Contributing to the accident was the night lighting condition, which precluded any possibility of the flight crew seeing the bird(s) prior to impact.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20071102X01708&key=1

Location


Revision history:

Date/timeContributorUpdates
28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
04-Dec-2017 18:57 ASN Update Bot Updated [Cn, Operator, Other fatalities, Source, Narrative]

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