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ASN Wikibase Occurrence # 166193
Last updated: 26 November 2021
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Type:Silhouette image of generic BE40 model; specific model in this crash may look slightly different
Beechcraft 400A Beechjet
Owner/operator:MLW La Paloma Inc
Registration: N412GJ
MSN: RK-412
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Sugar Land Regional Airport, TX -   United States of America
Phase: Take off
Departure airport:Sugar Land Regional Airport
Destination airport:Sparta/Fort McCoy Airport
Investigating agency: NTSB
The No. 2 engine sustained a yellow-crowned night-heron birdstrike during takeoff roll from Sugar Land Regional Airport (SGR)- Sugar Land, Texas. The impact from the birdstrike resulted in contact between the fan and inlet case that separated all nineteen (19) fan blades. The released blade fragments penetrated the engine case and cowl and caused an engine fire. A blade fragment impacted the right wing and punctured the fuel tank resulting in fuel spillage onto the wing surface and runway. Materials analysis on recovered fan blade fragments determined that all separated blades failed due to overload and no evidence of fatigue was identified. A series of modal tests including: tap hammer, high energy shaker, and computer model simulation were conducted at the system and component level. The tests identified a four nodal diameter coincidence at about 72% N1 speed. When sufficient energy is imparted to the engine fan during a foreign object ingestion event like a birdstrike, it may result in a rub induced excitation and subsequent fan blade separation and catastrophic engine failure.

The National Transportation Safety Board determines the probable cause(s) of this incident as follows:
The probable cause of the uncontained No. 2 engine failure on the Raytheon Beechjet 400A was a yellow-crowned night-heron birdstrike that resulted in fan blade contact with the inlet case and rub induced excitation of a previously unidentified natural frequency (resonance) within the engine operating range.


Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Download report: Final report


Revision history:

14-May-2014 09:20 Lexi Added
14-May-2014 09:21 harro Updated [Aircraft type, Cn, Location, Source]
14-May-2014 18:15 harro Updated [Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Apr-2017 22:14 Aerossurance Updated [Location, Source, Damage, Narrative]
05-Apr-2017 17:28 harro Updated [Source, Photo, ]

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