CEN21LA473

NTSB accident investigation · Beech 35-A33 · Mineral Wells, TX · July 23, 2021

Accident · Minor injuriesClass 3 · LimitedFinal report
Date
July 23, 2021, 07:45 local (12:45 UTC)
Place
Mineral Wells, TX
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N5MLBeech 35-A33
Defining event
Approach-VFR pattern final: Unknown or undetermined
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20210723011939A
Case key
104113

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

A partial loss of engine power for reasons that could not be determined based on available evidence.

Findings · 1

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.

Engine (reciprocating)Aircraft › Aircraft power plant · Unknown/Not determinedBeech 35-A33: 2 casesAll aircraft: 497 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

After a normal takeoff, the pilot encountered low clouds en route to his destination. He diverted to a nearby airport and avoided the clouds as he descended toward the airport. He entered a downwind for the runway and reduced the engine to a low power setting. After turning final, the pilot attempted to add power; however, the engine did not respond. He manipulated the throttle several times, but the engine did not increase from idle power. The pilot initiated a landing to a nearby field. The airplane touched down hard, the nose gear collapsed, and the airplane came to rest. During an on-scene examination, the fuel selector was found positioned on the left tank. About 3 inches of fuel was observed in the right-wing fuel tank, and no visible fuel was noted in the left-wing fuel tank. During a discussion with the pilot, he reported that the airplane was on the right fuel tank when the loss of power occurred. After recovery, a temporary fuel tank was connected to the fuel line at the left-wing root to facilitate an engine run. The airplane started and operated uneventfully at various engine speeds with no anomalies noted. Since the engine operated normally postaccident, and fuel was present in the right fuel tank, it is likely the engine was starved of fuel during the accident flight, which resulted in a loss of engine power.

Factual narrative

On July 23, 2021, at 0745 central daylight time, a Beech 35-A33 airplane, N5ML, was substantially damaged when it was involved in an accident near Mineral Wells Regional Airport (MWL), Mineral Wells, Texas. The pilot and passenger sustained minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot and passenger reported that the purpose of the flight was to fill the airplane with fuel for an upcoming flight. After a normal takeoff, they encountered low, dense clouds. The pilot elected to divert to MWL, and he conducted a spiral descent through a hole in the clouds. When the airplane entered downwind for runway 13, he reduced the engine to a low power setting. After turning final, the pilot attempted to add power; however, the engine did not respond. He confirmed the engine was still operating by looking at the manifold and fuel pressure gauges. He then manipulated the throttle several times, but the engine did not increase from idle. The pilot initiated a landing to a nearby field. The airplane touched down hard, the nose gear collapsed, and the airplane came to rest. On-scene examination by a Federal Aviation Administration (FAA) inspector noted that the right wing was wrinkled; however, there were no visible indications of a fuel leak. The auxiliary fuel tank gauge indicated empty, and the main fuel tank gauge indicated ¼ tank full when power was applied to the airplane. The right-wing fuel tank contained about 3 inches of fuel, and no visible fuel was noted in the left-wing fuel tank. The fuel selector was found selected to the left tank; however, during a discussion with the pilot, he reported that the right fuel tank was selected when the loss of power occurred. He reported that he turned off the fuel after the accident but must have accidentally placed the fuel selector on the left fuel tank. After the airplane was recovered, the propeller was replaced, and a temporary fuel tank was connected to the fuel line at the left-wing root to facilitate an engine run. The airplane started uneventfully and idled for a short time. The throttle was advanced to various rpm settings, and the engine responded accordingly. The propeller control was manipulated, and a magneto check was completed with no anomalies noted.

Aircraft

Registration
N5ML
Reported as
Beech 35-A33
Category
Airplane
Serial number
CD-225
Built
1060
Engine
Continental Motors IO-520-BB, 285 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
The Red Team LLC
Airworthiness certificate
Standard, Normal
Departed
XS53 · Weatherford, TX
Destination
Same as departure
Airport
MWL · Mineral Wells Regional Airport, runway 13, 5,996 × 100 ft, asphalt
Equipment
Unknown

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
47
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Seat
Left
Restraint
Lap only
Flight hours
782 total · 1 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 7 knots
Visibility
10 statute miles
Lowest ceiling
1,900 ft broken
Temperature
73 °F, dew point 70 °F
Altimeter
30.11 inHg
Observed at
KMWL, 1 nm away
METAR
KMWL 231253Z AUTO 14007KT 10SM BKN019 OVC024 23/21 A3011 RMK AO2 SLP182 T02330211

Docket · 6

The files NTSB released with the investigation on September 1, 2022, on NTSB’s docket system: statements, records, photos and specialists’ reports. 21.2 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.