WPR24LA305

NTSB accident investigation · Mooney M20F · Cottonwood, AZ · September 8, 2024

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
September 8, 2024, 06:50 local (13:50 UTC)
Place
Cottonwood, AZ
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N9628MMooney M20F
Defining event
Enroute: Abrupt maneuver
Weather
Visual (VMC) · Day
Status
Completed · report July 29, 2026
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20240908016249A
Case key
195129

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

On this page

Probable cause

The pilot’s evasive maneuver to avoid birds while on final approach at a low altitude, which resulted in the airplane colliding with a tree.

Findings · 3

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.

Object/animal/substance: animal(s)/bird(s)Environmental issues › Physical environment · Response/compensationMooney M20F: 1 caseAll aircraft: 358 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotMooney M20F: 15 casesAll aircraft: 9,295 casesProbable cause
ActionPersonnel issues › Action/decision · PilotMooney M20F: 1 caseAll aircraft: 111 casesProbable cause

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 was on final approach to the destination airport. Witnesses observed the airplane flying at a low altitude and heard the engine operating as it maneuvered toward the airport. The airplane appeared to encounter a flock of about 20 birds that rose from a dead tree about 35 ft above the ground. The airplane pitched up and turned left, consistent with the pilot attempting an evasive maneuver to avoid the birds. The airplane collided with a tree and residence. The pilot succumbed to his injuries and could not be interviewed. No bird DNA or feather fragments were detected in samples taken from the airplane. Although no physical evidence of a bird strike was identified, witness observations indicated that the pilot maneuvered to avoid birds that had risen into the airplane’s flight path. Witnesses observed the airplane flying at a low altitude as it approached the airport. The pilot likely did not have sufficient altitude to recover from the evasive maneuver before the airplane collided with a tree.

Factual narrative

On September 08, 2024, about 0650 Pacific daylight time, a Mooney M20F airplane, N9628M, was substantially damaged when it was involved in an accident near Cottonwood, Arizona. The pilot sustained serious injuries and later succumbed to his injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot departed from Deer Valley Airport, Phoenix, Arizona about 0625 with the intention of landing at Cottonwood Airport, Cottonwood, Arizona, and having breakfast with friends. A witness observed the airplane at a low altitude and then pitched up before colliding with a tree. The witness heard the engine operating as the airplane flew at a low altitude before it pitched up. He reported that the engine sound increased immediately before the airplane struck the tree. Another witness, who lives about a block from the impact location, reported the airplane flew very low over his street and appeared to encounter a flock of about 20 birds that rose from a dead tree about 35 feet above the ground. He stated the birds were likely western bluebirds about 7 inches long and that large numbers had been roosting and feeding on berries across the street from his home. He observed the airplane turn left, appear sideways, and then pass out of view. He stated he heard the impact shortly thereafter but did not witness the collision. The airplane came to rest inverted about 2,000 ft from the departure end of runway 32. The right fuel tank was breached and the fuel quantity before impact could not be ascertained. Three gallons of fuel were recovered from the fuel system as part of the retrieval efforts. There was evidence of fuel staining near the fuel caps on the upside-down wings, consistent with fluid in the wing tanks after impact. The landing gear had released from the uplocks but remained partially retracted within the wheel wells. The flaps were extended. A piece of windscreen and numerous swabs of the airframe were sent to the Smithsonian Institution's Feather Identification Lab for examination. No bird DNA or feather fragments were detected in any of the samples. The pilot succumbed to his injuries on October 15, 2024.

Aircraft

Registration
N9628M
Reported as
Mooney M20F
Category
Airplane
Serial number
670205
Built
1966
Engine
Lycoming IO-360-A1A, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Departed
KDVT · Phoenix, AZ
Destination
Same as departure
Airport
P52 · Cottonwood, runway 14/32, 4,250 × 75 ft, asphalt
Equipment
ADS-B

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
82
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
BasicMed, With waivers/limitations
Seat
Left
Flight hours
3,215 total

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 2 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
66 °F, dew point 37 °F
Altimeter
29.99 inHg
Observed at
KPRC, 20 nm away

Docket · 3

The files NTSB released with the investigation on July 29, 2026, on NTSB’s docket system: statements, records, photos and specialists’ reports. 994 KB in all.

FAA reports on this event · 1

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