Beechcraft 400A N193BJ

Summary

On 13 March 2014 at about 15:20 local time, a Beechcraft 400A registered N193BJ, operated by Guardian Pharmacy LLC, was involved in an incident near Rochester, New York, United States. 7 people were on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

13 March 2014 at 15:20

Classification

Incident

Location

Rochester, New York, United States

Nearest airport

Greater Rochester Intl (ROC)

Coordinates

43.1192, -77.6672

Aircraft

Beechcraft 400A

Registration

N193BJ

Category

Airplane

Year built

1998

Engines

2

Operator

Guardian Pharmacy LLC

Operating rule

Part 91: General Aviation

Purpose of flight

Executive/Corporate

Phase of flight

Not recorded

Route

Rochester → Unknown

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

ENG14IA011

Nobody was injured.

The probable cause of the uncontained No. 2 engine failure on the Raytheon Beechjet 400A was a herring gull 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.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The No. 2 engine sustained a herring gull bird strike during takeoff climb from Rochester International Airport- Rochester, NY. The impact from the birdstrike resulted in contact between the fan and inlet case that separated eleven (11) of the nineteen (19) fan blades and subsequently led to the failure of the No. 1 bearing housing, and a midshaft fracture of the low pressure turbine shaft. 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.

Quoted verbatim from the NTSB record.