Loss of control Accident Nanchang CJ-6A (Yak-18A) N99YK,
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ASN Wikibase Occurrence # 56845
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Date:Saturday 3 January 2009
Type:Silhouette image of generic CJ6 model; specific model in this crash may look slightly different    
Nanchang CJ-6A (Yak-18A)
Owner/operator:Centrol Inc
Registration: N99YK
MSN: 1332010
Engine model:Vendeneyev M14P
Fatalities:Fatalities: 2 / Occupants: 2
Aircraft damage: Destroyed
Location:near Justin-Propwash Airport, TX -   United States of America
Phase: Approach
Departure airport:Justin, TX (16X)
Destination airport:Justin, TX (16X)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
After leading a three-ship formation to the destination airport, and while in pattern to land, the lead airplane was observed to be in a very steep right turn that immediately turned to a near vertical nose-down descent. The airplane then impacted terrain in a near vertical nose-down attitude. A postimpact fire consumed portions of the cockpit, fuselage, right aileron, left elevator, rudder, and vertical fin. Prevailing winds were from 40 degrees from runway heading at 10 knots gusting to 19 knots. The investigation could not determine if the wind conditions contributed to the pilot's decision to use a steeper-than-normal bank angle. federal Aviation Administration Advisory Circulatory 61-67C informs pilots that accelerated stall can occur at higher-than-normal airspeed if there are abrupt and/or excessive control inputs such as during steep turns. An examination of the engine and airframe did not reveal any preimpact anomalies.
Probable Cause: The pilot's failure to maintain adequate airspeed while maneuvering on approach, which resulted in an accelerated stall and subsequent loss of control.

Accident investigation:
Investigating agency: NTSB
Report number: CEN09FA115
Status: Investigation completed
Duration: 1 year and 3 months
Download report: Final report





Photo: NTSB

Revision history:

04-Jan-2009 02:58 harro Added
04-Jan-2009 02:59 harro Updated
04-Jan-2009 23:41 Anon. Updated
05-Jan-2009 11:28 Anon. Updated
03-Mar-2010 10:48 harro Updated [Time, Phase, Nature, Departure airport, Destination airport, Source, Narrative]
10-Mar-2011 11:22 TB Updated [Aircraft type, Source, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 11:38 ASN Update Bot Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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