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ASN Wikibase Occurrence # 132818
Last updated: 29 May 2017
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Date:20-JAN-1988
Time:17:10
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Aérospatiale AS 350B
Owner/operator:Rocky Mountain Helicopters Inc
Registration: N26TM
C/n / msn: 1644
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Category:Accident
Location:Gemini Heliport, Omaha, Nebraska -   United States of America
Phase: Initial climb
Nature:Ferry/positioning
Departure airport:Gemini Heliport, Omaha, Nebraska (NE46)
Destination airport:
Investigating agency: National Transport Safety Bureau (NTSB) - United States of America
Narrative:
THE PILOT PICKED THE AIRCRAFT UP TO A HOVER AND MADE A HOVERING TURN IN PREPARATION FOR DEPARTURE. THE NOSE OF THE AIRCRAFT BEGAN TO RISE. THE PILOT STATED LATER THAT HE COULD NOT CONTROL THE AIRCRAFT. THE AIRCRAFT BEGAN TO DESCEND AND THE TAIL ROTOR STRUCK A SECURITY FENCE AROUND THE HELIPORT. THE MAIN ROTOR THEN STRUCK A WINDSOCK POLE, A TREE, A LIGHT POLE, AND A CONCRETE BENCH DURING THE ACCIDENT SEQUENCE.

THE ACCOMPLISHMENT OF THE MANUFACTURER'S SERVICE BULLETIN (SB) #67-05 HAD BEEN PARTIALLY COMPLETED. THE SB PROVIDED FOR PROTECTION AGAINST ICE IN THE HYDRAULIC SERVO BY INSTALLATION OF PROTECTIVE COVERS. THE PROTECTIVE COVERS HAD BEEN INSTALLED TO PROTECT THE OTHER TWO MAIN ROTOR SERVOS BUT NOT THE SERVO WHICH CONTROLLED FORE AND AFT CYCLIC CONTROL.

THE OMAHA AREA EXPERIENCED FREEZING PRECIPITATION THE NIGHT BEFORE THE ACCIDENT,THE TEMPERATURE HAD NOT RISEN ABOVE FREEZING DURING THE DAY, AND FREEZING PRECIPITATION WAS FORECAST.THIS WAS THE FIRST FLIGHT OF THE DAY FOR THIS AIRCRAFT

Sources:

1. NTSB: http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001213X24963&key=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=26tm
3. http://coptercrazy.brinkster.net/search/se350show.asp?start=601&count=50
4. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=11568
5. http://aircrashed.com/accident/MKC88FA043.shtml

Safety recommendations:

Safety recommendation A-89-78 issued 9 August 1989 by NTSB to FAA


Revision history:

Date/timeContributorUpdates
29-Jun-2014 03:54 Dr. John Smith Updated [Time, Location, Phase, Departure airport, Source, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

Corrections or additions? ... Edit this accident description