WPR18LA014

NTSB accident investigation · American AA 1A · Maricopa, AZ · October 21, 2017

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
October 21, 2017, 11:13 local (18:13 UTC)
Place
Maricopa, AZ
Injuries
2 serious
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N9239LAmerican AA 1A
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20171021021519A
Case key
96224

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 failure to see and avoid unmarked power lines during the approach to land.

Findings · 2

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: wireEnvironmental issues › Physical environment · Effect on operationAmerican AA-1A: 1 caseAll aircraft: 588 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 conducting a local personal flight. His son reported that his father was returning to the departure airport when the accident occurred. One witness reported that the airplane “seemed slow and too low” during the approach to land and that it struck power lines near the approach end of the runway. Subsequently, the airplane descended rapidly and impacted the runway. Several other witnesses reported that the airplane impacted unmarked power lines that were above a power line marked with orange guide balls. The pilot did not recall the accident sequence. Postaccident examination of the airplane did not reveal any preaccident mechanical malfunctions or failures that would have precluded normal operation. Given the witness statements, it is likely that, during the approach to land, the pilot allowed the airplane to drop below the glideslope, and he failed to see and avoid the unmarked power lines that were above the marked power line.

Factual narrative

On October 21, 2017, about 1113 mountain standard time, an American Aviation AA-1A airplane, N9239L, was substantially damaged when it was involved in an accident near Maricopa, Arizona. The pilot and passenger were seriously injured. The airplane was being operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot’s son reported that his father was returning to the departure airport when the accident occurred. A witness reported that the airplane “seemed slow and low” during the approach to land and that it then struck power lines. Subsequently, the airplane descended rapidly and impacted the runway, sustaining substantial damage to the right wing and fuselage. Several witnesses reported that the power lines were unmarked and were above a power line marked with orange guide balls. The pilot did not recall the accident. One of the witnesses reported seeing a power line wrapped around the landing gear. Examination of the airplane did not reveal evidence of any preaccident mechanical malfunctions or failures that would have precluded normal operation. Control continuity was established.

Aircraft

Registration
N9239L
Reported as
American AA 1A
Category
Airplane
Serial number
AA1A-0139
Engine
Lycoming O-235, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Departed
2AZ4 · Maricopa, AZ
Destination
2AZ4 · Maricopa, AZ
Airport
2AZ4 · Millar Airport, runway 16, 2,600 × 75 ft, asphalt
Equipment
None

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
75
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Medical
BasicMed
Seat
Left
Restraint
3-point
Flight hours
1 total · 1 in this make and model · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F, dew point 45 °F
Altimeter
30.02 inHg
Observed at
CHD, 21 nm away

Docket · 5

The files NTSB released with the investigation on January 8, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 6.8 MB 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.