Pilot Debrief

BELL 47G-3B-1 near Lakeville, MN — 2011-05-25

Final reportCEN11LA370
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Date
2011-05-25
Location
Lakeville, MN, USA
Aircraft
BELL 47G-3B-1
Registration
N96SH
Category
Helicopter
Highest injury
Serious
Fatalities
0
Phase of flight
Maneuvering

Probable cause

The loss of engine power due to a loose B-nut on the compressor discharge pressure bleed line.

NTSB narrative

The pilot stated that the helicopter experienced a total loss of engine power while maneuvering during an aerial application operation. He performed a forced landing to a swamp, which resulted in substantial damage to the airframe. Examination of the engine revealed that the compressor discharge pressure bleed line between the governor and the fuel control was leaking at a loose B-nut.

Analysis

Primary failure mode
Engine power loss
First missed decision gate
Proper maintenance could have prevented the engine power loss.

NTSB coding

Evidence available

  • 2 docket documents
View NTSB final reportView NTSB docket

Docket documents2

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