FTW97LA061

NTSB accident investigation · Piper PA-24-400 · Broomfield, CO · December 10, 1996

Accident · No injuriesLimited investigationFinal report
Date
December 10, 1996, 13:26 local (20:26 UTC)
Place
Broomfield, CO
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N8450PPiper PA-24-400
Weather
Visual (VMC) · Day
Status
Completed · report May 23, 1997
Report
Approved by Office Director
FAA report
19961210047559A
Case key
20126

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

failure of the pilot to maintain proper alignment with the runway, while landing. A factor relating to the accident was: the variable/gusty wind condition with possible windshear.

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.

Loss of control - in flightLanding - flare/touchdown
Weather condition - variable windFactor
Weather condition - gustsFactor
Weather condition - sudden windshiftFactor
Proper alignment - not maintainedPilot in commandCause
In flight collision with objectLanding
Object - vasi light/system
Object - airport sign/marker

Analysis

According to the pilot, the wind was variable from 230 to 270 degrees at 25 to 35 knots, although the ATIS reported the wind was from 260 degrees at 20 gusting 30 knots. Due to the wind condition (with moderate turbulence), the pilot decided to land 'a little long and 10 knots fast with no flaps.' As he flared for landing, the airplane 'gusted up, then down, with left wing high and strongly to the right.' The airplane struck two VASI light structures, while airborne. After the pilot realigned the airplane with the runway, he landed and the airplane departed the right side of the runway. Airport officials later reported three runway signs and four runway lights damaged.

Factual narrative

On December 10, 1996, at 1326 mountain standard time, a Piper PA-24-400, N8450P, owned and operated by Altob, Inc., was substantially damaged when it collided with taxiway signs and runway lights during landing at Broomfield, Colorado. The private pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the business flight conducted under Title 14 CFR Part 91. The flight originated at Lamar, Colorado, on December 10, 1996, at 1201.

According to the pilot's accident report, ATIS (Automatic Terminal Information Service) Information X-ray reported the wind to be from 260 degrees at 20 knots, with gusts to 30 knots. The pilot said that due to moderate turbulence he was experiencing, he decided to land "a little long and 10 knots fast with no flaps." As he flared for landing, the airplane "suddenly gusted up, then down, with left wing high and strongly to the right." He corrected with full left rudder and full power, but the airplane did not respond. The right landing gear struck a VARSI (sic) tower, then collided with a second VARSI structure. The pilot said he regained control and was able to align the airplane with the runway centerline at an altitude of 10 to 15 feet. He "rejected (the) impulse to 'go around'" and landed, holding the nose up with full up elevator "to minimize engine damage if (nose) gear (was) gone." As the nose was lowered, the airplane departed the right side of the runway. Jeffco Airport officials reported three runway signs and four runway lights were damaged.

The pilot also enclosed a hand-written transcript of his radio communications with the control tower, and a diagram of wind directions and velocities recorded at various times during the approach and landing. At 1325:57, the wind was from 270 degrees at 35 knots. Forty-five seconds later, at 1326:42, the wind was from 230 degrees at 25 knots. The pilot said this difference of 40 degrees and 10 knots was "evidence of wind shear almost exactly as landing flair commenced," and that it felt like "a sudden quartering tail wind from the left, leaving no rudder authority."

In his accident report, the pilot indicated his last biennial flight review was in 1989. No exact date was given.

Aircraft

Registration
N8450P
Reported as
Piper PA-24-400
Category
Airplane
Serial number
26-26
Airframe hours
4,877
Engine
Lycoming IO-720-A1A, 400 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Registered owner
James R. Chado
Airworthiness certificate
Standard, Normal
Last inspection
Annual · December 15, 1995 · 111 hours before
Departed
LAA · Lamar, CO
Destination
BJC
Airport
BJC · Jefferson County, runway 29R, 9,000 × 100 ft, asphalt

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
69
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
3,700 total · 2,400 in this make and model · 3,700 as pilot in command · 26 in the last 90 days · 15 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 20 knots, gusting 30
Visibility
75 statute miles
Lowest ceiling
6,000 ft broken
Temperature
54 °F, dew point 27 °F
Altimeter
29.00 inHg
Observed at
BJC

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 N8450P · 1

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