ANC22LA034

NTSB accident investigation · Cessna 170B · Big Lake, AK · May 21, 2022

Accident · No injuriesClass 4 · LimitedFinal report
Date
May 20, 2022, 17:30 local (May 21, 2022, 01:30 UTC)
Place
Big Lake, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N2692DCessna 170B
Defining event
Landing-flare/touchdown: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Alaska Regional Office
Parties
FAA
FAA report
20220520007399A
Case key
105111

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 NTSB’s determination of the probable cause, and any contributing factors.

The pilot's failure to maintain adequate airspeed during final approach which resulted in the airplane exceeding its critical angle of attack and a subsequent aerodynamic stall at too low of an altitude to recover.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings.

Analysis

The pilot reported that, while on final approach to landing at a private airstrip, he was slow to correct for a slower-than-normal airspeed. Subsequently, the airplane entered an aerodynamic stall, and descended into a swampy area short of the runway. The airplane sustained substantial damage to the wings. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident.

Aircraft

Registration
N2692D
Reported as
Cessna 170B
Category
Airplane
Serial number
20844
Built
1952
Airframe hours
4,424.4
Engine
Continental O-300, 145 hp, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 19, 2022 · 0.5 hours before
Destination
PAGQ · Big Lake, AK
Airport
PAGQ · Big Lake Airport, runway 070, 800 × 60 ft, dirt
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
60
Injuries
None
Certificate
Commercial
Instrument ratings
Helicopter
Medical
Class 3, With waivers/limitations
Seat
Left
Restraint
Lap only
Flight hours
3,920 total · 27 in this make and model · 2,905 as pilot in command · 1 in the last 90 days · 1 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
190° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
70 °F, dew point 30 °F
Altimeter
30.30 inHg
Observed at
PAWS, 9 nm away
METAR
PAWS 210156Z AUTO 19006KT 10SM CLR 21/M01 A3030 RMK AO2 SLP264 T02111006

Docket · 2

The files NTSB released with the investigation on October 20, 2022, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.8 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.

Other investigations on N2692D · 1

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