Accident de Havilland Canada DHC-6 Twin Otter 300 N361V, Tuesday 15 February 1983
ASN logo
 

Date:Tuesday 15 February 1983
Time:11:02
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different    
de Havilland Canada DHC-6 Twin Otter 300
Owner/operator:Sierra Pacific Airlines
Registration: N361V
MSN: 361
Year of manufacture:1973
Total airframe hrs:4767 hours
Engine model:Pratt & Whitney Canada PT6A-27
Fatalities:Fatalities: 0 / Occupants: 8
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:1,7 km S of Hailey-Sun Valley Airport, ID (SUN) -   United States of America
Phase: Approach
Nature:Passenger - Scheduled
Departure airport:Boise Air Terminal, ID (BOI/KBOI)
Destination airport:Hailey-Sun Valley Airport, ID (SUN/KSUN)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The Twin Otter, operating on a flight for Transwestern, approached Hailey runway 31 at an altitude of 800 feet when the captain reduced power. Suddenly, the aircraft nosed over and descended steeply. The pilot tried to control the descent by adding power. The plane crash-landed on a highway, veered off and struck a 4 feet high snow bank.

PROBABLE CAUSE: "The in-flight loss of elevator control following separation of the control rod from the torque tube at a connection where the company's maintenance department had used a non-standard, unsecured bolt, which the company's inspection department had failed to detect. Contributing to the accident was the company's failure to maintain the separation of maintenance and inspection functions required by the maintenance program approved by the Federal Aviation Administration, and the failure of the FAA to detect the company's deviation from approved maintenance procedures during surveillance inspection."

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: NTSB/AAR-84-03
Status: Investigation completed
Duration: 1 year
Download report: Final report

Sources:

Location of Commercial Aircraft Accidents/Incidents Relative to Runways / FAA, Office of Safety Oversight (DOT/FAA/AOV 90-1)
NTSB-AAR-84-03

Images:


photo (c) via Werner Fischdick; Marana-Pinal Air Park, AZ (MZJ); October 1982

Revision history:

Date/timeContributorUpdates

The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF on social media FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2024 Flight Safety Foundation

1920 Ballenger Av, 4th Fl.
Alexandria, Virginia 22314
www.FlightSafety.org