Thursday, July 20, 2017

Enstrom F-28C, N5697B, DuBois Aviation Inc: Accident occurred July 19, 2017 near Chino Airport (KCNO), San Bernardino County, California

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Riverside, California

Aviation Accident Preliminary Report - National Transportation Safety Board:

DuBois Aviation Inc:

NTSB Identification: WPR17LA158
14 CFR Part 91: General Aviation
Accident occurred Wednesday, July 19, 2017 in Ontario, CA
Aircraft: ENSTROM F 28C, registration: N5697B
Injuries: 1 Serious.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On July 19, 2017, about 1010 Pacific daylight time, an Enstrom F28-C rotorcraft, N5697B, experienced a partial loss of engine power and landed hard in a dirt pasture about 1/2-mile northeast of the Chino Airport (CNO), Ontario, California. The student pilot, sole occupant, was seriously injured and the helicopter sustained substantial damage to the tailboom and main rotor blades. The helicopter was registered to Dubois Aviation Inc and operated by the pilot as a 14 Code of Federal Regulations Part 91 solo instructional flight. Visual meteorological conditions prevailed and no flight plan was filed. The flight originated from CNO at about 1005.

The student pilot reported he entered the downwind leg to set up for the first landing of the day. When abeam his touchdown location, he conducted the prelanding checks with no anomalies noted. Prior to turning base the pilot lowered the collective, reduced the throttle, and started to descend at about 100 feet per minute. During the descent, he observed the engine RPM to be slightly above 2,900 RPM, and he reduced the throttle. The RPMs reduced slightly, however, went back to 2,900 RPM, and the manifold pressure was about 10 inches of HG. At about 400 feet above the ground, he heard the engine sound increase and he observed 3,300-2,500 RPM. Unable to make the runway, he continued the descent towards a pasture and landed hard in the dirt. 

The airplane has been moved to a secure location for further examination.

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