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ASN Wikibase Occurrence # 34980
Last updated: 27 April 2019
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Date:31-DEC-1992
Time:15:36
Type:Silhouette image of generic AC90 model; specific model in this crash may look slightly different
Rockwell Aero Commander 690B
Owner/operator:Medic Air
Registration: N300CP
C/n / msn: 11374
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Herlong, CA -   United States of America
Phase: Approach
Nature:Unknown
Departure airport:Reno, NV (RNO)
Destination airport:Susanville, CA (SVE)
Investigating agency: NTSB
Narrative:
THE PILOT AND FLIGHT NURSE WERE EN ROUTE TO PICK UP A MEDICAL PATIENT. THE AIRPLANE EXPERIENCED AN IN-FLIGHT BREAKUP WHILE FLYING BY THE LEEWARD SIDE OF THE SIERRA NEVADA MOUNTAINS IN THE GENERAL AREA WHERE STANDING LENTICULAR CLOUDS HAD BEEN OBSERVED. NO EVIDENCE WAS FOUND THAT THE PILOT OBTAINED A WEATHER BRIEFING FROM FLIGHT SERVICE OR THE DUAT VENDORS PRIOR TO DEPARTURE. PILOTS FLYING IN THE GENERAL AREA HAD REPORTED AIRSPEED VARIANCES FROM PLUS 60 TO MINUS 40 KTS. AN IN-FLIGHT WEATHER ADVISORY FOR OCCASIONAL MODERATE TURBULENCE WAS IN EFFECT. ABOUT ONE HOUR AFTER THE ACCIDENT THE WEATHER SERVICE ISSUED A SIGMET FOR SEVERE TURBULENCE. CAUSE: AN INADVERTENT ENCOUNTER WITH SEVERE TURBULENCE WHICH EXCEEDED THE DESIGN STRENGTH OF THE AIRPLANE'S STRUCTURE.

Sources:

NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X16173
Air Britain's Business Turboprops International 2009
AVL 316


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
11-Feb-2012 11:41 Gwydd Updated [Aircraft type, Source]
10-Jul-2013 16:08 Anon. Updated [Phase, Source]

Corrections or additions? ... Edit this accident description