SEA06CA137

NTSB accident investigation · Hughes 369A · Medford, OR · July 6, 2006

Accident · No injuriesData collectionFinal report
Date
July 6, 2006, 16:55 local (23:55 UTC)
Place
Medford, OR
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N72LBHughes 369A
Weather
Visual (VMC) · Day
Status
Completed · report October 31, 2006
Report
Approved by Office Director
Parties
FAA FSDO
Case key
64130

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

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Probable cause

The pilot's misinterpretation of the wind direction (in-flight planning) and subsequent improper descent rate to the ground during a landing attempt. A factor was the tailwind conditions.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Hard landingLanding
Weather condition - tailwindFactor
Proper descent rate - not maintainedPilot in commandCause
In-flight planning/decision - inadequatePilot in commandCause

Analysis

The pilot said that he flew a high reconnaissance circle over his intended landing site. He observed ripples on a pond which led him to believe that the wind was from the south. During his landing approach, as he descended to 10 to 15 feet AGL, he pulled up on the collective to extend his glide. The pilot said the helicopter started to settle and became very unstable. He "recognized it as settling with power down wind." He leveled the skids and the helicopter hit the ground; he said that 1 or 2 seconds later the helicopter began to lift and turn to the right. He applied left pedal with no response; he then lowered the collective. Subsequently, the left skid tube caught the ground and collapsed, and the helicopter came to rest on its left side. The main rotor blades did not come in contact with the ground or any part of the helicopter, but the tail rotor blades were broken. Additionally the tail boom and tail rotor drive shaft were broken. The pilot said that after he got out of the helicopter, he noticed that the wind was variable with light gusts. He said that the pond was being filled with water which gave him an incorrect interpretation of the wind conditions for landing.

Factual narrative

On July 6, 2006, at approximately 1655 Pacific daylight time, a Hughes 369A, N72LB, was substantially damaged during a hard landing near Medford, Oregon. The commercial pilot and his three passengers were not injured. The helicopter was being operated under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the personal, cross-country flight which had originated from a private residence approximately 25 minutes earlier. The pilot had not filed a flight plan.

The pilot said that he flew a high reconnaissance circle over his intended landing site. He observed ripples on a pond which led him to believe that the wind was from the south. During his landing approach, as he descended to 10 to 15 feet AGL, he pulled up on the collective to extend his glide. The pilot said the helicopter started to settle and become very unstable. He "recognized it as settling with power down wind." He leveled the skids and the helicopter hit the ground; he said that 1 or 2 seconds later the helicopter began to lift and turn to the right. He applied left pedal with no response; he then lowered the collective. Subsequently, the left skid tube caught the ground and collapsed, and the helicopter came to rest on its left side. The main rotor blades did not come in contact with the ground or any part of the helicopter, but the tail rotor blades were broken. Additionally the tail boom and tail rotor drive shaft were broken.

The pilot said that after he got out of the helicopter, he noticed that the wind was variable with light gusts. He said that the pond was being filled with water which gave him an incorrect interpretation of the wind conditions for landing.

Aircraft

Registration
N72LB
Reported as
Hughes 369A
Category
Helicopter
Serial number
691194
Airframe hours
4,405
Engine
Allison 250-C10D, 317 horsepower, turbo shaft
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
John Holmes
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 1, 2005 · 44 hours before
Departed
NONE · Medford, OR
Destination
NONE · Jacksonville, OR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
34
Injuries
None
Certificate
Commercial
Medical
Class 2, Without waivers/limitations
Last flight review
June 1, 2006
Seat
Right
Flight hours
188 total · 160 in this make and model · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
280° at 12 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 48 °F
Altimeter
30.14 inHg
Observed at
MFR, 7 nm away