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Crash of a De Havilland DHC-6 Twin Otter 300 in Etsouali: 3 killed

Date & Time: Mar 12, 1992
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
TN-ACX
Flight Phase:
Flight
Flight Type:
Scheduled Revenue Flight
Survivors:
Yes
Site:
Plain, Valley
Schedule:
Owando - Brazzaville
MSN:
452
YOM:
1975
Location:
Etsouali
Plateaux
Country:
Congo
Region:
Africa
Crew on board:
3
Crew fatalities:
Pax on board:
5
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
En route from Owando to Brazzaville, while in cruising altitude, the crew encountered stormy weather when the aircraft lost height and crashed in a prairie. All five passengers were seriously injured and all three crew members were killed. The loss of control occurred in thunderstorm activity.

Crash of a De Havilland DHC-6 Twin Otter 200 in Poste-Montagnais

Date & Time: Jan 20, 1992 at 1510 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
C-FHNM
Flight Phase:
Takeoff (climb)
Flight Type:
Cargo
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
Schedule:
Poste-Montagnais - Seven Islands
MSN:
127
YOM:
1968
Location:
Poste-Montagnais
Quebec
Country:
Canada
Region:
North America
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
During the takeoff roll on icy runway 18, the aircraft deviated to the left but the crew continued the takeoff procedure. At liftoff, the aircraft struck a 1,2 metre snowdrift and crashed, coming to rest upside down. Both pilots escaped uninjured and the aircraft was damaged beyond repair and later transferred to Norway on static display.

Crash of a De Havilland DHC-6 Twin Otter 300 on Mt Nasuha: 15 killed

Date & Time: Sep 27, 1991
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
H4-SIA
Flight Phase:
Flight
Flight Type:
Scheduled Revenue Flight
Survivors:
No
Site:
Mountains
Schedule:
Honiara - Kirakira
MSN:
271
YOM:
1969
Location:
Mt Nasuha
All Solomon Islands
Country:
Solomon Islands
Region:
Oceania
Crew on board:
2
Crew fatalities:
Pax on board:
13
Pax fatalities:
Other fatalities:
Total fatalities:
15
Circumstances:
The aircraft departed Honiara-Henderson Airport on a flight to Kirakira, carrying 13 passengers and two pilots. En route, the crew encountered poor weather conditions and while cruising at an altitude of 4,100 feet in poor visibility, the aircraft struck the southern slope of Mt Nasuha located in the southeast part of the Guadalcanal Island. The wreckage was found three days later in an isolated area and all 15 occupants were killed. It was reported that a local DME system was out of service at the time of the accident due to maintenance and the crew was flying under VFR mode in IMC conditions.
Probable cause:
Controlled flight into terrain.

Crash of a De Havilland DHC-6 Twin Otter near Surkhet: 3 killed

Date & Time: Jul 10, 1991 at 1200 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
RAN-26
Flight Phase:
Takeoff (climb)
Flight Type:
Military
Survivors:
No
Site:
Mountains
Schedule:
Surkhet - Jumla
MSN:
843
YOM:
1988
Location:
Surkhet
Bheri
Country:
Nepal
Region:
Asia
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
Four minutes after his takeoff from Surkhet Airport, while climbing to an altitude of 5,800 feet, the captain informed ATC about good flight conditions and that he was leaving the valley shortly. A minute later, while flying in clouds, the aircraft struck the slope of a mountain (6,300 feet high) located few km from Surkhet Airport. The wreckage was found 500 feet below the summit and all three occupants were killed.
Probable cause:
Controlled flight into terrain following a wrong altimeter setting. It was determined that the crew departed Surkhet Airport under VFR mode but while climbing, he encountered limited visibility as the mountain struck by the aircraft was shrouded in clouds. At impact, the captain's altimeter showed 7,350 feet while the aircraft's real altitude was 5,800 feet.

Crash of a De Havilland DHC-6 Twin Otter 300 in Yopal: 3 killed

Date & Time: Jul 4, 1991 at 0910 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
HK-2889X
Flight Phase:
Landing (descent or approach)
Flight Type:
Charter/Taxi (Non Scheduled Revenue Flight)
Survivors:
No
Site:
Airport (less than 10 km from airport)
MSN:
606
YOM:
1979
Location:
Yopal
Casanare
Country:
Colombia
Region:
South America
Crew on board:
2
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
While approaching Yopal Airport under VFR mode in poor weather conditions, the aircraft struck the slope of a mountain located about 8 km from the airstrip. The aircraft was destroyed and all three occupants were killed. At the time of the accident, the aircraft deviated 20° to the left of the intended course. The exact cause of this deviation could not be determined, because of strong winds or because the crew elected to avoid bad weather.
Probable cause:
Controlled flight into terrain following a VFR approach in IMC conditions.

Crash of a De Havilland DHC-6 Twin Otter in Simikot

Date & Time: Jun 20, 1991 at 1224 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
9N-ABS
Flight Phase:
Landing (descent or approach)
Flight Type:
Humanitarian
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
Schedule:
Nepalgunj - Simikot
MSN:
795
YOM:
1982
Location:
Simikot
Karnali
Country:
Nepal
Region:
Asia
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
On final approach to Simikot Airport, the twin engine aircraft struck a tree and crashed 500 meters short of runway. Both pilots were injured.

Crash of a De Havilland DHC-6 Twin Otter 300 in Lukla

Date & Time: Jun 9, 1991 at 1010 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
9N-ABA
Flight Phase:
Landing (descent or approach)
Flight Type:
Scheduled Revenue Flight
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
Schedule:
Kathmandu - Lukla
MSN:
301
YOM:
1971
Location:
Lukla-Tenzing-Hillary
Sagarmatha
Country:
Nepal
Region:
Asia
Crew on board:
3
Crew fatalities:
Pax on board:
14
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
While descending to Lukla Airport, weather conditions deteriorated and the captain decided to go-around and to follow a holding pattern. Few minutes later, as he thought weather conditions improved, he decided to attempt to land and initiated a second approach. On short final, the aircraft entered a layer of low clouds and the aircraft was not properly aligned when it struck the runway surface and bounced. Out of control, it veered off runway and came to rest in a ravine. All 17 occupants were injured and the aircraft was destroyed.

Crash of a De Havilland DHC-6 Twin Otter 300 near Taisha: 22 killed

Date & Time: Feb 14, 1991
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
FAE447
Flight Phase:
Flight
Flight Type:
Scheduled Revenue Flight
Survivors:
No
Site:
Mountains
Schedule:
Macas - Taisha
MSN:
832
YOM:
1986
Location:
Taisha
Pichincha
Country:
Ecuador
Region:
South America
Crew on board:
2
Crew fatalities:
Pax on board:
20
Pax fatalities:
Other fatalities:
Total fatalities:
22
Circumstances:
En route from Macas to Taisha on behalf of the Mission Aviation Fellowship (MAF), the crew encountered poor weather conditions and limited visibility. The aircraft struck the slope of Mt Paso Macuna (1,500 meters high) located about 34 km west of Taisha. The wreckage was found 35 meters below the summit and all 22 occupants were killed.
Probable cause:
Controlled flight into terrain.

Crash of a De Havilland DHC-6 Twin Otter 300 in Iran: 3 killed

Date & Time: Dec 1, 1990
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
EP-IOD
Flight Phase:
Flight
Flight Type:
Executive/Corporate/Business
Survivors:
No
Site:
Mountains
MSN:
460
YOM:
1975
Location:
Iran
All Iran
Country:
Iran
Region:
Asia
Crew on board:
2
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
Crashed in unknown circumstances in a mountainous area located in the south part of Iran.

Crash of a De Havilland DHC-6 Twin Otter 100 in Honningsvåg: 3 killed

Date & Time: Oct 29, 1990 at 1430 LT
Type of aircraft:
De Havilland DHC-6 Twin Otter
Operator:
Registration:
67-063
Flight Phase:
Landing (descent or approach)
Flight Type:
Military
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
MSN:
63
YOM:
1967
Location:
Honningsvåg
Finnmark
Country:
Norway
Region:
Europe
Crew on board:
3
Crew fatalities:
Pax on board:
12
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
On final approach to Honningsvåg-Valan in marginal weather conditions, the aircraft started to pitch up and down then stalled. The crew increased power and the aircraft was able to gain a little height when it stalled a second time and crashed 150 meters short of runway threshold. Both pilots and a passenger were killed while 12 other occupants were injured.
Probable cause:
It was determined that the crew completed the approach at a too low airspeed according to the wind component and force. At the time of the accident, atmospheric turbulences and relative strong winds were present in the approach path and the crew failed to adapt his speed according to these phenomenons. The relative low experience of the crew was considered as a contributing factor.
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