Serious incident HAL Chetak (SA 316B Alouette III) VT-EGK, Friday 4 January 2013
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Date:Friday 4 January 2013
Time:
Type:Silhouette image of generic ALO3 model; specific model in this crash may look slightly different    
HAL Chetak (SA 316B Alouette III)
Owner/operator:Prabhatam Aviation
Registration: VT-EGK
MSN: AH-240
Year of manufacture:1979
Fatalities:Fatalities: 0 / Occupants: 5
Other fatalities:0
Aircraft damage: Substantial
Category:Serious incident
Location:Indira Gandhi International Airport - VIDP -   India
Phase: Taxi
Nature:Test
Departure airport:VIDP
Destination airport:
Investigating agency: AAIB India
Confidence Rating: Accident investigation report completed and information captured
Narrative:
While carrying out taxi after the main rotor blade change, main rotor blades hit the tail boom damaging main and tail rotor blades including tail boom. All five occupants escaped uninjured.

Probable cause of the incident
During taxiing, for undertaking an in-flight vibrex recording, for the main rotor blades, the helicopter went into ground resonance. In order to control the resonance, the pilot picked up the helicopter for hover, but as the resonance could not be controlled, the helicopterwas hurriedly put down which resulted in the main rotor blades contacting the Stabilizer/tail boom with consequential damages. The undulated surface at the place of the incident probably contributed to the initiation of resonance.

Accident investigation:
cover
  
Investigating agency: AAIB India
Report number: 
Status: Investigation completed
Duration:
Download report: Final report

Sources:

http://www.bea.aero/fr/enquetes/2013/2013.semaine.02.pdf

History of this aircraft

Other occurrences involving this aircraft

22 May 2007 VT-EGK Prabhatam Aviation 0 Shri Kedarnathji helipad min

Revision history:

Date/timeContributorUpdates
18-Jan-2013 12:25 Alpine Flight Added

Corrections or additions? ... Edit this accident description

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