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ASN Wikibase Occurrence # 76303
Last updated: 26 November 2021
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Date:06-MAY-1989
Time:12:38
Type:Silhouette image of generic B412 model; specific model in this crash may look slightly different
Bell 412
Owner/operator:Era Aviation
Registration: N524EH
MSN: 33069
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Girdwood, AK -   United States of America
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Valdez, AK
Destination airport:Anchorage, AK
Investigating agency: NTSB
Narrative:
WHILE IFR AT 10,000 FEET OVER MOUNTAINOUS TERRAIN, THE HELCIOPTER EXPERIENCED VIOLENT VERTICAL VIBRATIONS, WHICH CONTINUED UNTIL THE CRASH-LANDING ABOUT FIVE MINUTES LATER. ON BOARD WEATHER RADAR WAS USED TO GUIDE THE HELICOPTER AROUND THE MOUNTAIN TOPS, WHICH WERE IN THE CLOUDS. AT ABOUT 200 FEET ABOVE THE GROUND, THE HELICOPTER CAUGHT FIRE, TAIL ROTOR CONTROL WAS LOST, BOTH ENGINES QUIT, AND CYCLIC CONTROL BECAME UNRESPONSIVE. THE HELICOPTER WAS DESTROYED BY POST-CRASH FIRE. ABOUT ONE HOUR OF FLT TIME EARLIER, THE HELICOPTER HAD UNDERGONE AN INSPECTION, DURING WHICH THE MAIN ROTOR FLIGHT CONTROL SYSTEM BOLTS HAD BEEN RETORQUED. ALL BUT ONE OF THESE BOLTS WERE FOUND IN THE WRECKAGE. HOWEVER, THE ROD END FOR THE MISSING BOLT WAS FOUND.

Sources:

https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X28212&key=1
https://www.ntsb.gov/ntsb/GenPDF.asp?id=ANC89FA069&rpt=fa
https://www.ntsb.gov/ntsb/GenPDF.asp?id=ANC89FA069&rpt=fi


Revision history:

Date/timeContributorUpdates
14-Aug-2010 12:48 Alpine Flight Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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