20050913020519A

Accident · Substantial damage

FAA accident report · Bell 47G-3B-1 · Rock Springs, WY · September 13, 2005

Date: September 13, 2005 · 11:50 local
Place: Rock Springs, WY
Phase of flight: Forced/Precautionary Landing
Operating rules: General operating rules (Part 91)
Damage: Substantial damage
Aircraft: N24SD
NTSB investigation: NTSBDEN05LA137
Reported as: Bell 47G3B1
People aboard: 2
Fatal injuries: 0
Pilot’s flight hours: 2,940 total1,540 in this make and model309 in the last 90 days

N24SDRegistration cancelled Jul 14, 2008 · Bell 47G-3B-1S/N 3671 · Built 1967 Airframe modelBell 47G-3B-1 Engine modelLycoming TVO-435-GIATurbo-prop

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-23) Inspection of the aircraft revealed that the upper planetary gear in the transmission failed, this caused an engine overspeed and emergency landing. During a wild horse roundup when the aircraft had just moved forward from a hover at about twenty-five feet AGL, the pilot heard a grinding noise. The engine began to overspeed and an autorotation was initiated. The aircraft landed hard causing substantial damage to the aircraft. Inspection of the aircraft revealed that the upper planetary gear failed.

As the FAA filed it

(-23) INSPECTION OF THE AIRCRAFT REVEALED THAT THE UPPER PLANETARY GEAR IN THE TRANSMISSION FAILED, THIS CAUSED AN ENGINE OVERSPEED AND EMERGENCY LANDING. DURING A WILD HORSE ROUNDUP WHEN THE AIRCRAFT HAD JUST MOVED FORWARD FROM A HOVER AT ABOUT TWENTY-FIVE FEET AGL, THE PILOT HEARD A GRINDING NOISE. THE ENGINE BEGAN TO OVERSPEED AND AN AUTOROTATION WAS INITIATED. THE AIRCRAFT LANDED HARD CAUSING SUBSTANTIAL DAMAGE TO THE AIRCRAFT. INSPECTION OF THE AIRCRAFT REVEALED THAT THE UPPER PLANETARY GEAR FAILED.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB DEN05LA137Accident · No injuriesLimited investigationFinal reportRock Springs, WYthe pilot's failure to maintain control of the helicopter during the attempted autorotation after he experienced an engine overspeed that occurred for reasons undetermined.Sep 13, 2005 · Substantial damage

Other reports on N24SD · 1

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

Accident 20080411836879AHovering · Dinio, NV(-23) Accident occurred on a predator eradication flight (coyote). After culling a coyote they returned to the carcass to determine status of same when at approximately twenty feet above the ground in a near hover the gear box started to make a grinding…Apr 11, 2008 · Substantial damage