Accident
Last updated: 20 April 2014
Status:Schlussbericht
Datum:Samstag 28 Dezember 1991
Zeit:21:46
Flugzeugtyp:Silhouette image of generic B190 model; specific model in this crash may look slightly different
Beechcraft 1900C
Betrieben durch:Delta Connection
Gemietet von :Business Express Airlines
Kennzeichen: N811BE
Werknummer: UB-49
Baujahr: 1985
Betriebsstunden:11265
Triebwerk: 2 Pratt & Whitney Canada PT6A-65B
Besatzung:Todesopfer: 3 / Insassen: 3
Fluggäste:Todesopfer: 0 / Insassen: 0
Gesamt:Todesopfer: 3 / Insassen: 3
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:17 km (10.6 Meilen) ENE vom Land entfernt von Block Island, RI (   USA) show on map
Flugphase: Manövrieren (MNV)
Betriebsart:Ausbildungsflug
Flug von:Bridgeport-Igor I. Sikorsky Memorial Airport, CT (BDR/KBDR), USA
Flug nach:Bridgeport-Igor I. Sikorsky Memorial Airport, CT (BDR/KBDR), USA
Unfallbericht:
Two co-pilots were preparing for an upgrade flight. The instructor disabled the student's attitude indicator and an engine failure was simulated in the procedure turn for an instrument approach. The student became disoriented and asked the instructor to take control, which he refused. The aircraft later struck the sea.

PROBABLE CAUSE: "The instructor pilot's loss of altitude awareness and possible spatial disorientation, which resulted in the loss of control of the airplane at an altitude too low for recovery; and company management's lack of involvement in and oversight of its Beechcraft 1900 flight training program. Contributing to the accident was the instructor pilot's exercise of poor judgment in establishing a flight situation and airplane configuration conducive to spatial disorientation that afforded the pilots little or no margin for error."
The ALPA did not agree with the probable cause adopter by the NTSB. In a 1997 ALPA petition they claim that a whirl mode flutter was induced to the right engine and propeller assembly, due to pre-existing right engine truss tube failures. This whirl mode flutter caused a catastrophic failure within the truss mount system. This failure allowed the right engine and nacelle to depart the right wing. The right engine struck and removed the right horizontal stabilizer. The propeller probably damaged the left horizontal stabilizer. The aircraft then pitched over violently and instantly and crashed.

Informationsquelle:
» Aircraft Damage Detection From Acoustic Signals Found By A Cockpit Voice Recorder / Ronald O. Stearman et al
» Air Safety Week 3.5.1993 (p. 3)
» ICAO Adrep Summary 4/94 (#14)
» Petition for Reconsideration of Probable Cause, N811BE (The Investigation Process Research Resource Site)

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-93-01-SUM
download report: NTSB/AAR-93-01-SUM
cover

Sicherheitsempfehlungen

NTSB issued 5 Safety Recommendations

Show all AD's and Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Bridgeport-Igor I. Sikorsky Memorial Airport, CT to Bridgeport-Igor I. Sikorsky Memorial Airport, CT as the crow flies is NAN km (NAN miles).

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