ASN Wikibase Occurrence # 141892
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| Date: | Sunday 15 January 2012 |
| Time: | |
| Type: |  HAL Dhruv |
| Owner/operator: | Border Security Force (BSF), opb Pawan Hans Helicopter |
| Registration: | VT-BSN |
| MSN: | DCWF-05 |
| Year of manufacture: | 2010 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Mana (VARP), Raipur -
 India
|
| Phase: | En route |
| Nature: | Test |
| Departure airport: | Mana Airport (VARP) |
| Mana Airport (VARP) | |
| Investigating agency: | AAIB India |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Dhruv Advanced Light Helicopter (ALH) VT-BSN, suffered an accident at Raipur Aerodrome at 06:57 UTC. The helicopter was undergoing a Vibrex Check for Dynamic Balancing after Tail Rotor (TR) blade paint touch up work. On completion of first part of the check in ‘Out of Ground Effect’ (OGE) hover, the PIC had initiated a vertical descent wherein descent rate became high. He raised the Collective pitch lever to arrest the descent which further aggravated the situation. The descent continued and the helicopter impacted ground uncontrolled. It bounced upwards after the initial impact and settled back on runway after rotation through approximately 360 degrees.
The helicopter was extensively damaged and all five occupants, including two Flight Crew received injuries to varied extent. There was no fire.
Probable Causes and Contributing Factors
The accident is attributed to loss of Situational Awareness by the PIC wherein he allowed the helicopter to enter Vortex Ring state during vertical descent. High rate of descent in low power settings had led to onset of the phenomenon. The Flight Crew failed to recognize the condition, therefore, stipulated recovery actions were not initiated. Instead, the PIC attempted to arrest the descent by raising Collective lever which aggravated the situation. Crew’s fixation to vibrations’ history of this helicopter and other speculated failures contributed towards misjudgement of the situation. Limited experience on type and inadequate knowledge of the helicopter systems also contributed towards the accident.
Accident investigation:
 |
|
Sources:
http://www.dnaindia.com/india/report-bsf-helicopter-crashes-in-raipur-three-injured-1637796
https://www.youtube.com/watch?v=Pmlrb9mOYT0 (video)
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Jan-2012 03:37 | gerard57 | Added |
| 15-Jan-2012 05:05 | RobertMB | Updated [Aircraft type, Registration, Location, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 15-Jan-2012 17:24 | RobertMB | Updated [Registration, Cn, Total occupants, Source, Narrative] |
| 15-Mar-2013 21:18 | TB | Updated [Time, Aircraft type, Operator, Location, Departure airport, Destination airport, Source, Narrative] |
| 15-Mar-2013 21:26 | TB | Updated [Total occupants, Source, Narrative] |
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