GAA17CA468

NTSB accident investigation · Cessna 170 · Moab, UT · August 4, 2017

Accident · Serious injuriesData collectionFinal report
Date
August 3, 2017, 19:50 local (Aug 4, 2017, 01:50 UTC)
Place
Moab, UT
Injuries
1 serious, 1 minor
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N1214DCessna 170
Defining event
Enroute-climb to cruise: Windshear or thunderstorm
Weather
Visual (VMC) · Dusk
Status
Completed · report March 14, 2018
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20170803010289A
Case key
95748

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 improper decision to depart in unfavorable weather conditions, which resulted in a hard, forced landing.

Findings · 4

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.

Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationCessna 170A: 9 casesAll aircraft: 1,199 cases
Wind: sudden wind shiftEnvironmental issues › Conditions/weather/phenomena · Effect on operationCessna 170A: 1 caseAll aircraft: 114 cases
Wind: downdraftEnvironmental issues › Conditions/weather/phenomena · Effect on operationCessna 170A: 2 casesAll aircraft: 178 cases

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

According to the pilot, he and his passenger were waiting in the fixed-base operator building for the storm system to pass. When the storm system appeared to have passed and the wind had calmed significantly, the pilot checked the Automated Surface Observing System and took off from runway 21. During the initial climb, the pilot observed "just beyond the end of the pavement was the obvious sign of a small microburst developing with blowing dust curling up in several different directions centered just to the right of the centerline, and it was growing spreading out quickly." The pilot was able to climb the airplane to about 400 ft before encountering wind at the departure end of the runway. He made a slight left turn to avoid power lines and performed a forced landing. The airplane landed hard and sustained substantial damage to both wings, the fuselage, and empennage. The Special METAR reported that, about the time of the accident, the wind was from 280° at 23 knots, gusting to 34 knots. The visibility was 10 statute miles with light rain. There were few clouds at 3,500 ft, and the ceiling was broken at 9,000 ft and 11,000 ft. The temperature was 84°F, and the dew point was 45°F. The altimeter setting was 30.06 inches of mercury. The peak wind was from 10° at 40 knots at 1903, and the wind shifted direction at 1910. The rain began at 1958 with trace precipitation. The density altitude was 7,164 ft. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

According to the pilot, he and his passenger were waiting in the fixed-base operator building for the storm system to pass. When the storm system appeared to have passed and the wind had calmed significantly, the pilot checked the Automated Surface Observing System (ASOS) and took off on runway 21. During the initial climb, the pilot observed "Just beyond the end of the pavement was the obvious sign of a small microburst developing with blowing dust curling up in several different directions centered just to the right of the centerline, and it was growing spreading out quickly". The pilot was able to climb about 400ft before encountering the wind at the departure end of the runway. He made a slight left turn to avoid powerlines and performed a forced landing. The airplane landed hard and sustained substantial damage to both wings, the fuselage and the empennage. The Special METAR, reported that about the time of the accident the wind was from 280° at 23 knots gusting to 34 knots. The visibility was10 statute miles with light rain. There were few clouds at 3,500 feet and the ceiling was broken at 9,000 feet and 11,000 feet. The temperature was 84°F and the dew point was 45°F. The altimeter setting was 30.06 inches of mercury. The peak wind was from 10° at 40 knots at 1903 MDT and the wind shifted direction at 1910 MDT. The rain began at 1958 MDT with trace precipitation. The density altitude was 7,164ft. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N1214D
Reported as
Cessna 170 (A)
Category
Airplane
Serial number
19768
Built
1950
Airframe hours
3,309
Engine
Continental O-300-A, 145 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · August 13, 2016
Departed
CNY · Moab, UT
Destination
U69 · Duchesne, UT
Airport
CNY · Canyonlands Field, runway 21, 7,100 × 75 ft
Equipment
Electronic flight bag or handheld device, 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
46
Injuries
Minor
Certificates
Flight instructor, Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
June 13, 2017
Seat
Left
Restraint
3-point
Flight hours
12,169 total · 633 in this make and model · 7,968 as pilot in command · 130 in the last 90 days · 40 in the last 30 days

Weather

Conditions
Visual (VMC) · Dusk
Wind
280° at 23 knots, gusting 34
Visibility
10 statute miles
Lowest ceiling
9,000 ft broken
Temperature
84 °F, dew point 45 °F
Altimeter
30.05 inHg
Observed at
KCNY, 1 nm away

Docket · 4

The files NTSB released with the investigation on January 30, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 5.2 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.

Other investigations on N1214D · 1

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