Crash of a Mitsubishi MU-2B-36 Marquise in Terrace: 2 killed

Date & Time: Dec 20, 2005 at 1834 LT
Type of aircraft:
Operator:
Registration:
C-FTWO
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Terrace – Vancouver
MSN:
672
YOM:
1975
Flight number:
FCV831
Country:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
2111
Captain / Total hours on type:
655.00
Copilot / Total flying hours:
2000
Copilot / Total hours on type:
500
Circumstances:
At 1834 Pacific standard time, the Nav Air Charter Inc. Mitsubishi MU-2B-36 aircraft (registration C-FTWO, serial number 672) took off from Runway 15 at the Terrace Airport for a courier flight to Vancouver, British Columbia. The left engine lost power shortly after take-off. The aircraft descended, with a slight left bank, into trees and crashed about 1600 feet east of the departure end of Runway 15 on a heading of 072° magnetic. The aircraft was destroyed by the impact and a post-crash fire, and the two pilots were fatally injured.
Probable cause:
Findings as to Causes and Contributing Factors:
1. During the take-off, the left engine combustion chamber plenum split open due to a fatigue crack. The rupture was so extensive that the engine flamed out.
2. The crew did not feather the left engine or retract the flaps, and the aircraft entered a moderate left-hand turn after take-off; the resulting drag caused the aircraft to descend until it contacted trees.
3. The first officer’s flying skills may have been challenged during the handling of the engine failure, and the checklist was conducted out of sequence, suggesting that there may have been uncertainty in the cockpit. A contributing factor may have been the captain’s unfamiliarity with handling an emergency from the right seat.
4. The use of flap 20 for take-off, although in accordance with company policy, contributed to the difficulty in handling the aircraft during the emergency.
Findings as to Risk:
1. The TPE331 series engine plenum is prone to developing cracks at bosses, particularly in areas where two bosses are in close proximity and a reinforcing weld has been made. Cracks that develop in this area cannot necessarily be detected by visual inspections or even by fluorescent dye-penetrant inspections (FPIs).
2. Because the wing was wet and the air temperature was at 0°C, it is possible that ice may have formed on top of the wing during the take-off, degrading the wing’s ability to generate lift.
3. Being required to conduct only flap 20 take-offs increases the risk of an accident in the event of an engine problem immediately after take-off.
Other Finding:
1. The plenum manufactured with a single machined casting, incorporating the P3 and bleed air bosses, is an improvement over the non-single casting boss plenum; however, cracks may still develop at bosses elsewhere on the plenum.
Final Report:

Crash of a De Havilland DHC-3 Otter near Terrace: 2 killed

Date & Time: May 9, 1996 at 1430 LT
Type of aircraft:
Registration:
C-GDOB
Flight Phase:
Flight Type:
Survivors:
No
Site:
Schedule:
Ketchikan – Prince Rupert – Dawson Creek – Buffalo Narrows
MSN:
194
YOM:
1957
Country:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
10000
Copilot / Total flying hours:
5000
Circumstances:
The single-engine, float-equipped DHC-3 Otter departed Ketchikan, Alaska, at 0905 Pacific daylight time (PDT) on 09 May 1996 with a pilot and co-pilot on board. They were on a visual flight rules (VFR) ferry flight to Dawson Creek, British Columbia, en route to Buffalo Narrows, Saskatchewan. After a refuelling stop and weather briefing at Prince Rupert, British Columbia, the aircraft departed eastbound along the published Telkwa Pass VFR route. When the aircraft did not arrive at Dawson Creek, it was reported overdue. The next day, an extensive search for the missing Otter was commenced and wreckage was located by search and rescue aircraft at 1930 PDT, 30 miles east of Terrace, in the Telkwa Pass. The aircraft had struck mountainous terrain and was destroyed. Both occupants were fatally injured.
Probable cause:
The absence of aircraft wreckage and documentation precludes an analysis of the technical aspects of this accident. This analysis, therefore, concentrates solely on the operational aspects. The high impact speed is indicative of either a loss of control followed by a rapid descent into terrain or controlled flight into unseen terrain. Given that the pilot reported encountering snow showers within 15 miles of the accident site, it is possible that the weather continued to deteriorate and may have adversely affected the pilot's ability to maintain visual contact with the terrain.
Findings:
1. The weight and centre of gravity of the aircraft at the last take-off were estimated to have been within the prescribed limits.
2. The pilot was certified, trained, and qualified for the flight in accordance with existing regulations.
3. Marginal visual weather conditions existed in the vicinity of the accident site.
4. It is possible that deteriorating weather affected the pilot's ability to maintain visual contact with the terrain.
Causes and Contributing Factors:
It was not determined why the aircraft struck terrain; however, it is likely that the contact occurred during conditions of reduced visibility.
Final Report:

Crash of a Piper PA-31-350 Navajo Chieftain near Terrace: 4 killed

Date & Time: Oct 22, 1990 at 1400 LT
Operator:
Registration:
C-GKIY
Flight Phase:
Survivors:
No
Schedule:
Terrace – Iskut – Dease Lake – Bronson Creek – Terrace
MSN:
31-7852004
YOM:
1978
Country:
Crew on board:
1
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
4
Captain / Total flying hours:
700
Aircraft flight hours:
5520
Circumstances:
The aircraft was on a scheduled visual flight rules (VFR) flight from Terrace to Iskut to Dease Lake to Bronson Creek and back to Terrace, British Columbia. The aircraft departed Terrace about 1005 Pacific standard time (PST) and arrived Iskut about 1145, departed Iskut about 1155 and arrived Dease Lake about 1230, and departed Dease Lake about 1250 and arrived Bronson Creek about 1340. All of these flights were completed without incident, and the aircraft departed Bronson Creek for Terrace at about 1350 with the pilot and three passengers on board. Ten minutes later, the pilot spoke on the radio to a pilot who was flying from Smithers to Bronson Creek when the two aircraft passed each other approximately 20 miles east of Bronson Creek. This was in the Iskut River valley just east of the confluence of the Forest Kerr River and the Iskut River. This was the last reported contact with the aircraft, and the pilot did not report a problem at that time. An air and ground search was started after the aircraft was reported missing, but the aircraft was not found and the search was abandoned. No emergency locator transmitter (ELT) signal was detected. The wreckage was found by chance on 05 August 1994, nearly four years after the accident.
Probable cause:
The pilot likely attempted to continue the visual flight into an area of instrument meteorological conditions.
Final Report:

Crash of a Swearingen SA227AC Metro III in Terrace: 7 killed

Date & Time: Sep 26, 1989 at 0828 LT
Type of aircraft:
Registration:
C-GSLB
Survivors:
No
Schedule:
Prince Rupert - Terrace
MSN:
AC-481
YOM:
1981
Flight number:
SLK070
Country:
Crew on board:
2
Crew fatalities:
Pax on board:
5
Pax fatalities:
Other fatalities:
Total fatalities:
7
Aircraft flight hours:
11177
Circumstances:
A Swearingen SA227-AC Metro III passenger plane, operating as Skylink Flight 070 was destroyed in accident at Terrace Airport, BC (YXT), Canada. All five passengers and two crew members were killed. Flight 070 took off from Vancouver, BC (YVR) at 06:51 on a scheduled domestic flight to Terrace, BC. At 08:20 Flight 070 was cleared for an approach at Terrace. At 08:27, at an altitude of 1,200 feet asl and just prior to reaching the published missed approach point (MAP), the captain stated "OK, I got the button here." Fourteen seconds after this, the captain saw the button of runway 27. At approximately this same time, the aircraft was observed on what corresponded to a downwind leg for runway 15 at about 500 feet above ground level (agl), flying straight and level over the threshold of runway 27, with the landing gear down. The aircraft crossed the localizer transmitter at an altitude of 1,100 feet asl and at an airspeed of 140 knots. Approximately 30 seconds after crossing the localizer transmitter, the aircraft commenced a descent out of 1,100 feet, and the flaps were lowered to the full position. The aircraft then levelled at an altitude of approximately 900 feet. At or about this same time, the aircraft was observed on base leg for runway 15 at a low altitude, close to the east/west ridge located about 1.5 miles north of the airport. Twenty-six seconds after full flap was selected, a missed approach was initiated, and the landing gear and flaps were selected up. Within five seconds of the initiation of the missed approach, the aircraft began to accelerate and a rate of climb of approximately 1,200 feet per minute was established. This rate of climb quickly diminished to zero, followed by the start of a descent which quickly increased to 3,000 feet per minute. As the aircraft descended, the co-pilot called "descending" twice. A few seconds later, the aircraft struck trees on the west side of runway 15 just inside the airport perimeter. A second and final impact with the ground occurred just outside the airport perimeter approximately 800 feet from the initial tree strike. A fire erupted following the ground impact.
Probable cause:
The crew continued with the approach beyond the missed approach point without establishing the required visual references. The evidence indicates that, while subsequently carrying out a missed approach in IFR conditions, the aircraft was flown into the ground in a manner consistent with disorientation. Contributing to the occurrence were the inadequacy of the company's operating procedures, the reduced operating standards, and the inadequate definition of the visual references required for a circling approach.

Crash of a De Havilland DHC-6 Twin Otter 300 in Terrace: 12 killed

Date & Time: Jan 14, 1977
Operator:
Registration:
C-GNTB
Survivors:
No
Schedule:
Prince George – Terrace
MSN:
463
YOM:
1975
Country:
Crew on board:
3
Crew fatalities:
Pax on board:
9
Pax fatalities:
Other fatalities:
Total fatalities:
12
Circumstances:
On approach to Terrace Airport, the crew encountered poor weather conditions with snow falls. On final, the pilot-in-command failed to realize his altitude was too low when, at an altitude of 1,200 feet, the airplane struck a hill located about 3 km short of runway. The aircraft was destroyed upon impact and all 12 occupants were killed.