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Last updated: 27 September 2021
Statuts:Enquête Officielle
Date:dimanche 10 novembre 2013
Heure:18:29
Type/Sous-type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AC Metro III
Compagnie:Bearskin Airlines
Immatriculation: C-FFZN
Numéro de série: AC-785B
Année de Fabrication: 1991
Heures de vol:35474
Moteurs: 2 Garrett TPE331-11U-612G
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 3 / à bord: 5
Total:victimes: 5 / à bord: 7
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:ca 0,8 km S of Red Lake Airport, ON (YRL) (   Canada)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Sioux Lookout Airport, ON (YXL/CYXL), Canada
Aéroport de destination:Red Lake Airport, ON (YRL/CYRL), Canada
Numéro de vol:JV311
Détails:
Bearskin Airlines Flight JV311 crashed while on approach to runway 26 at Red Lake Airport, Ontario, Canada. Both pilots and three of the five passengers were killed in the accident.
Flight 311 was a scheduled flight between Thunder Bay, Ontario, and Winnipeg, Manitoba, with stops in Sioux Lookout, Ontario, and Red Lake, Ontario. The flight from Thunder Bay and the subsequent departure from Sioux Lookout were uneventful.
At 18:16, Winnipeg ACC cleared Bearskin 311 to the Red Lake Airport for the VOR/DME runway 26 approach, and advised the pilots to contact Kenora Flight Service Station (FSS).
The descent checklist was carried out and, at 18:17, the crew advised Kenora FSS that they had been cleared by Winnipeg ACC for an approach to runway 26 at the Red Lake Airport. Because the crew were expecting to encounter visual conditions prior to landing, a full approach briefing was not carried out.
The landing checklist was completed and, at 18:27, the crew advised Kenora FSS that they were 5 nautical miles (nm) on final approach for runway 26 at the Red Lake Airport. At 18:28, at approximately 500 feet above ground level and approximately 1.4 nm from the runway, the crew noted an aircraft malfunction but did not immediately identify the nature of it. Maximum power was applied to one or both engines, and the landing gear was initially selected up and then re-selected down before it could fully retract. The crew declared an emergency with Kenora FSS and unsuccessfully attempted to initiate a climb. Shortly afterwards, the aircraft veered and rolled to the left, descended, and struck trees with its left wing. The aircraft continued through the trees and struck a series of hydro lines that ran parallel to Ontario Highway 125, before coming to rest in a wooded area adjacent to the highway.
A post-crash fire erupted.

Probable Cause:

Findings as to causes and contributing factors:
1. A first-stage turbine wheel blade in the left engine failed due to a combination of metallurgical issues and stator vane burn-through.
2. As a result of the blade failure, the left engine continued to operate but experienced a near-total loss of power at approximately 500 feet above ground level, on final approach to Runway 26 at the Red Lake Airport.
3. The crew were unable to identify the nature of the engine malfunction, which prevented them from taking timely and appropriate action to control the aircraft.
4. The nature of the engine malfunction resulted in the left propeller being at a very low blade angle, which, together with the landing configuration of the aircraft, resulted in the aircraft being in an increasingly high drag and asymmetric state. When the aircraft’s speed reduced below minimum control speed (VMC), the crew lost control at an altitude from which a recovery was not possible.

Findings as to risk:
1. If pilots believe that the negative torque sensing (NTS) system in the SA227 aircraft will activate in the event of any power loss or that NTS activation alone can provide adequate anti-drag protection in the event of an engine power loss, there is a risk that flight crews operating these aircraft types may not initiate the Engine Failures In Flight checklist in a timely manner.
2. If there is no requirement for a boroscope inspection of the TPE331-11U-612G’s internal engine components in conjunction with the 450-hour fuel nozzle inspection, there is an increased risk that premature internal engine damage will not be detected.
3. If there are discrepancies between the fuel nozzle testing procedures described in the TPE331-11U-612G maintenance manual and the corresponding fuel nozzle overhaul manual, there is a risk that unserviceable fuel nozzles may be evaluated as serviceable and re-installed on aircraft.

Accident investigation:
cover
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 1 year and 5 months
Accident number: A13C0150
Download report: Final report

Sources:
» CADORS 2013O3414

METAR Weather report:
00:00 UTC / 18:00 local time:
CYRL 110000Z 30014G22KT 10SM -SN DRSN OVC018 M10/M13 A3008 RMK SC8 SLP212

00:44 UTC / 18:44 local time:
CYRL 110044Z 32010KT 8SM -SN DRSN SCT020 RMK SC3 ACCIDENT CHECK VIA CYPL
Wind 320 degrees at 10 knots; Visibility: 8 miles; Light snow, low drifting snow; Scattered clouds at 2000 feet AGL.

01:00 UTC / 19:00 local time:
CYRL 110100Z 32010KT 8SM -SN DRSN SCT020 M11/M13 A3011 RMK SC3 VIA CYPL SLP224


Photos

photo of Swearingen-SA227-AC-Metro-III-C-FFZN
accident date: 10-11-2013
type: Swearingen SA227-AC Metro III
registration: C-FFZN
photo of Swearingen-SA227-AC-Metro-III-C-FFZN
accident date: 10-11-2013
type: Swearingen SA227-AC Metro III
registration: C-FFZN
photo of Swearingen-SA227-AC-Metro-III-C-FFZN
accident date: 10-11-2013
type: Swearingen SA227-AC Metro III
registration: C-FFZN
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Sioux Lookout Airport, ON et Red Lake Airport, ON est de 169 km (106 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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