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WPR11CA243

2011-05-27 · Glendale, Arizona, United States · None · 1 aircraft · Status: Completed

Airport KGEU

Current FAA registration · N59383

Make / Model
BELL 206B
Year of manufacture
1973 · 38 years old at event
Engine
ALLISON 250 SER 400HP (400 hp)
Seats / Engines
5 seats · 1 engine
Last airworthiness date
19730913
ADS-B equipped
Yes — Mode-S A7AC18

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The certified flight instructor's failure to maintain adequate main rotor RPM during the autorotation.

Factual narrative

The certified flight instructor reported that he took off in the helicopter to show a student pilot a demonstration of various maneuvers. Near the end of the flight the instructor demonstrated a power on autorotation but he was late rolling on the throttle and did not have sufficient rotor RPM to recover the helicopter before impacting the ground. Upon ground impact the helicopter's tail rotor drive shaft and main rotor blades were damaged. The pilot reported no pre-impact mechanical malfunctions of failures with the airframe or the engine that would have precluded normal operation. The certified flight instructor reported that the purpose of the flight was to demonstrate a variety of maneuvers to the student in the helicopter. Near the end of the flight the instructor demonstrated a power-on autorotation; however, he delayed the application of power and did not have sufficient rotor RPM to recover the helicopter before impacting the ground. Upon ground impact, the helicopter's tail rotor drive shaft and main rotor blades were damaged. The pilot reported no preimpact mechanical malfunctions of failures with the airframe or the engine that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • C Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Instructor/check pilot - C
  • C Personnel issues-Task performance-Use of equip/info-Aircraft control-Instructor/check pilot - C
  • C Aircraft-Aircraft power plant-Engine controls-Power lever-Incorrect use/operation - C
  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Prop/rotor parameters-Not attained/maintained - C

Verbatim from NTSB's published report. Source file NTSB_2011_WPR11CA243.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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