ASN logo
ASN Wikibase Occurrence # 147398
Last updated: 14 January 2021
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Time:19:30 LT
Type:Silhouette image of generic MI8 model; specific model in this crash may look slightly different
Mil Mi-8T
Owner/operator:Techmont Heli Co.
Registration: OM-TMT
C/n / msn: 98308361
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Substantial
Location:near Poprad-Tatry Airport - LZTT -   Slovakia
Phase: En route
Departure airport:LZTT
Destination airport:
During the construction works this helicopter flew several times to Chata pod Rysmi mountain hut, located at 2250 meters over the sea. When the goods were offloaded there (carried on the rope under the helicopter), during the steep descent through the valley the free end of the rope hit the tail rotor blades, causing damage to it. The crew was able to fly the chopper to Poprad airport (TAT/ LZTT), but on approach controlling the helicopter became more and more difficult until it crash-landed within the airport perimeter and rolled to its side with main rotor and tail section destructed. OM-TMT was written off afterwards. Not any serious injuries to its crew.

Causes of air accidents:
• the entry of the helicopter in a massive vortex generated by convective activity in its descending part. The acummulation of the helicopter swing and the assymetric air circulation with regard to the lateral motion provoked by MR activated an impulse which at a speed of 180 km.h-1 tossed the loose end of transport cable to the working area of antitorque
• the pilot´s decision to make hover landing with damaged anti-torque rotor. This type of landing manoeuvre requires higher engine output and hence increased reaction moment, which the damaged anti-torque rotor was unable to counterbalance even by full actuation of the rudder pedal.
Secondary cause:
• performance of aerial work in difficult mountain terrain and specific weather conditions.



LZSV Spisska Nova Ves; July 18, 2009

OM-TNT at Nitra back in 2008 photo: Peter Hupka

Revision history:

03-Aug-2012 12:25 Anon. Added
03-Aug-2012 12:26 harro Updated [Aircraft type, Total fatalities, Other fatalities, Damage, Narrative]
03-Aug-2012 12:30 Anon. Updated [Time]
03-Aug-2012 12:48 DaPlane Updated [Registration, Operator]
03-Aug-2012 12:50 Anon. Updated [Total occupants, Source]
04-Aug-2012 01:02 DaPlane Updated [Embed code]
04-Aug-2012 01:06 harro Updated [Aircraft type, Cn, Operator, Total occupants, Location, Phase, Departure airport, Narrative]
07-Aug-2012 09:47 Alpine Flight Updated [Time, Location, Departure airport]
17-Aug-2012 03:13 Lubos Sramek Updated [[Time, Location, Departure airport]]
25-Dec-2015 08:45 Anon. Updated [Source, Narrative, Photo, ]
21-Aug-2017 20:45 Aerossurance Updated [Source]
21-Aug-2017 21:09 Aerossurance Updated [Location, Source, Narrative]

Corrections or additions? ... Edit this accident description