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ASN Wikibase Occurrence # 134621
Last updated: 6 March 2021
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Type:Silhouette image of generic UH12 model; specific model in this crash may look slightly different
Hiller UH-12E
Owner/operator:B and S Air, Inc.
Registration: N112EC
C/n / msn: HA3012
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Cleveland, TN -   United States of America
Phase: Standing
Departure airport:Cleveland, TN
Destination airport:
Investigating agency: NTSB
According to the pilot, the externally slung, hydraulically operated fertilizer bucket stopped dispensing. With no ground handling crewman available, the pilot set the rotorcraft down to troubleshoot the problem. With engine rpm near maximum to run the hydraulic pump to its maximum output, the pilot climbed out of the left seat, onto the left skid to read the externally mounted hydraulic pressure gage. While egressing the cockpit, the pilot accidentally bumped the collective control to the "increase rotor pitch" position, and the rotorcraft became airborne without him aboard. The rotorcraft climbed to about 500 feet agl, in circling flight until the loaded fertilizer bucket began swinging in ever-divergent oscillations causing rotorcraft instability and eventual main rotor-to-boom strike and crash.
Probable Cause: The PIC's failure to follow safe operating procedures for the maintenance of the rotorcraft's external aerial application equipment, resulting in inadvertent activation of collective as he egressed the rotorcraft, causing unmanned flight, in-flight break-up, and collision with terrain.



Revision history:

21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
10-Dec-2017 10:25 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Source, Narrative]

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