WPR11LA190

NTSB accident investigation · Bell 47G · Torrance, CA · April 6, 2011

Accident · Minor injuriesLimited investigationFinal report
Date
April 6, 2011, 13:55 local (20:55 UTC)
Place
Torrance, CA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N9FKBell 47G
Defining event
Takeoff: Dynamic rollover
Weather
Visual (VMC) · Day
Status
Completed · report March 20, 2012
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
FAA FSDO
FAA report
20110406006399A
Case key
78803

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot did not maintain adequate altitude during takeoff, which resulted in ground contact and a dynamic rollover.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Action: incorrect action sequencePersonnel issues › Action/decision · PilotBell 47G: 1 caseAll aircraft: 77 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBell 47G: 3 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedBell 47G: 1 caseAll aircraft: 1,310 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The helicopter pilot reported that he applied power and pitch for takeoff and lifted up about 2 to 3 feet while starting a pedal turn to the right. He said that the helicopter then abruptly started to turn hard to the right and that he then had no control over the helicopter, so he immediately lowered the collective to stop the rotation. When the helicopter touched down, it immediately rolled onto its right side, shattering the cabin bubble and the main rotor blades. An airport operations employee heard the noise and responded to assist the pilot. He said that the pilot told him that he was in a hover just above the ground and that he “was cleared for takeoff and it just went over.” No gusts were reported on the day of the accident. The pilot did not report any known preimpact mechanical discrepancies with the helicopter. It is likely that the pilot simultaneously performed a right-pedal turn while transitioning to forward flight at too low an altitude.

Factual narrative

On April 6, 2011, at 1355 Pacific daylight time, a Bell 47G helicopter, N9FK, sustained substantial damage when it impacted terrain following a loss of control during departure at Zamperini Field (TOA), Torrance, California. The private pilot, the sole occupant, received minor injuries. The owner/pilot was operating the helicopter under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed for the personal cross-country flight, which was originating at the time of the accident. A flight plan had not been filed. The pilot reported that he received clearance to take off. He applied power and pitch, and lifted up approximately 2 to 3 feet while starting a pedal turn to the right. He stated that the helicopter "abruptly started to turn right hard and he had no control over the helicopter." He immediately lowered the collective to stop the rotation. When the helicopter touched down, it immediately rolled onto its right side, shattering the cabin bubble and main rotor blades. Additionally, the fuselage was distorted and bent. An airport operations employee heard the noise and responded to assist the pilot. He said the pilot told him that he “was in a hover just above the ground. I was cleared for takeoff and it just went over.” The wind reported at 1357, at Torrance, was from 270 degrees at 8 knots; no wind gusts were reported during the 24-hour period on the day of the accident. The pilot did not report any known preimpact mechanical discrepancies with the helicopter.

Aircraft

Registration
N9FK
Reported as
Bell 47G
Category
Helicopter
Serial number
1675
Airframe hours
14,339
Engine
Franklin 6V350a, 235 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Rodriguez Danny
Registered owner
Rodriguez Danny
Airworthiness certificate
Special, Restricted (Special); Standard, Normal
Last inspection
Annual · August 13, 2010
Departed
TOA · Torrance, CA
Destination
HHR · Hawthorne, CA
Flight plan
Unknown
Airport
TOA · Zamperini Field

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
62
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
September 22, 2010
Seat
Left
Flight hours
1,686 total · 686 in this make and model · 27 in the last 90 days · 10 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 8 knots
Visibility
7 statute miles
Lowest ceiling
8,000 ft broken
Temperature
68 °F, dew point 54 °F
Altimeter
29.97 inHg
Observed at
TOA

Docket · 3

The files NTSB released with the investigation on February 9, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.4 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N9FK · 1

Matched to the same aircraft by N-number and date.