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ASN Wikibase Occurrence # 44143
Last updated: 10 March 2020
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Type:Silhouette image of generic C170 model; specific model in this crash may look slightly different
Cessna 170B
Registration: N4488B
C/n / msn: 26832
Fatalities:Fatalities: 4 / Occupants: 4
Other fatalities:5
Aircraft damage: Written off (damaged beyond repair)
Location:Chugiak , AK -   United States of America
Phase: En route
Departure airport:Chugiak, AK (PABV)
Destination airport:Talkeetna, AK (PATK)
Investigating agency: NTSB
On April 23, 2006, about 1158 Alaska daylight time, a wheel-equipped Cessna 170B airplane, N4488B, and a wheel-equipped Cessna 172 airplane, N5049A, collided in midair, approximately 7 miles north-northwest of Chugiak, Alaska. Both airplanes were being operated as visual flight rules (VFR) personal flights under Title 14, CFR Part 91, in visual meteorological conditions when the accident occurred. The certificated airline transport pilot, and the three passengers aboard the Cessna 170B, sustained fatal injuries. The sole occupant of the Cessna 172, a certificated commercial pilot, also sustained fatal injures. Both airplanes were destroyed during the collision, uncontrolled descent, and impact with tidal mud flats.

The 172, piloted by a solo commercial pilot, was traveling in a west-southwest direction. The 170B, with an airline transport certificated pilot and three passengers, was flying northbound, at an estimated altitude between 1,500 and 2,000 feet. A pilot-rated ground witness said he saw the two airplanes collide. He stated that as the Cessna 172 approached the Cessna 170B's right side, and as their flight paths converged, he heard the 172's engine power increase, and then saw the airplane pitch-up sharply. He said the two airplanes then collided, with the 170B striking the left side of the 172. Both airplanes became momentarily entwined, and then fell vertically to the ground. An examination of the wreckage disclosed impact signatures consistent with the witness's statement, with the 170B displaying black tire rubber deposits on portions of the white paint that covered the left lift strut. Traces of black, tire material were also discovered on portions of the 170B's propeller assembly. The Cessna 172's left main tire and inner tube were slashed longitudinally, consistent with a propeller strike, through to the aluminum wheel hub assembly. No radar coverage existed for the air space near the accident site, and neither pilot was in communication with any air traffic control facility. Toxicological samples were submitted from both pilots, and both tested negative for alcohol or drugs.
Probable Cause: The inadequate visual lookout by the pilots of both airplanes during cruise flight, which resulted in their failure to see-and-avoid each other, and a subsequent midair collision.



Revision history:

28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
05-Dec-2017 09:05 ASN Update Bot Updated [Operator, Total fatalities, Total occupants, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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