LAX08CA209

NTSB accident investigation · Aerostar International S-77A · Boulder, CO · July 2, 2008

Accident · Minor injuriesData collectionFinal report
Date
July 2, 2008, 06:00 local (12:00 UTC)
Place
Boulder, CO
Injuries
2 minor, 5 uninjured
Damage
Substantial damage
Phase of flight
Standing
Aircraft
N9014WAerostar International S-77A
Defining event
Standing: Miscellaneous/other
Weather
Visual (VMC) · Dawn
Status
Completed · report September 26, 2008
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20080702840569A
Case key
68379

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

An encounter with a sudden gust of wind, which rendered the balloon uncontrollable and led to a collision with a tree.

Findings · 5

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.

Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Not specifiedAerostar International S-77A: 1 caseAll aircraft: 1,199 casesProbable cause
Wind: updraftEnvironmental issues › Conditions/weather/phenomena · Not specifiedAerostar International S-77A: 1 caseAll aircraft: 14 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Not specifiedAerostar International S-77A: 1 caseAll aircraft: 933 cases

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 pilot performed a normal cold-inflation of the balloon and instructed the passengers to board. The balloon was suddenly overcome by a gust of wind that pushed the envelope into a tree. The balloon was drawn upward by the wind, with its vent lines still entangled in the tree. As the lines became taut, sections of material ripped from the envelope, resulting in several long vertical tears. The pilot elected to abort the flight due to increasing wind speeds. The pilot attempted to gain control and stabilize the balloon, but it descended and collided with a tree. The basket came to rest about 20 feet above terrain. The pilot stated that there were no preimpact mechanical malfunctions or failures with the balloon.

Factual narrative

In a written statement, the pilot reported that he performed a normal cold-inflation of the balloon. He instructed the passengers to board and prepared for flight by arranging lines. The balloon was suddenly overcome by a gust of wind, pushing the envelope into a tree. The pilot elected to abort the flight due to increasing wind speeds. The balloon was suddenly dragged upward by the wind, but several rotation vent lines remained entangled in the tree. As the lines became taut, they ripped a section of material from the envelope, resulting in several long vertical tears (4 to 5 yards in length).

The pilot opened the burners in an attempt to gain control. As the balloon's airspeed increased to the wind speed, it descended and the basket collided with the wall of a building. It was again pulled up by the wind, and the pilot again applied heat to gain control. The balloon descended, and collided with a tree. The basket came to rest about 20 feet above terrain.

The pilot added that there were no preimpact mechanical malfunctions or failures with the balloon. He stated that the weather information he gathered via the Flight Service Station (FSS) did not predict wind gusts.

Aircraft

Registration
N9014W
Reported as
Aerostar International S-77A
Category
Balloon
Serial number
S77A-3024
Engine
Damage
Substantial damage
Flight
Aerial observation · Part 91
Operator
Tommy Cederlund, doing business as Sunny Day Come Fly Away
Registered owner
Colorado Rocky Ballooning LLC
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · May 1, 2008
Departed
Boulder, CO
Airport
KBDU · Boulder Municipal Airport

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
59
Certificate
Commercial
Flight hours
2,810 total · 1,000 in this make and model

Weather

Conditions
Visual (VMC) · Dawn
Wind
310° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Observed at
BJC, 12 nm away

FAA reports on this event · 1

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