CEN15CA036

NTSB accident investigation · Flight Design CTLSi · White Bear Lake, MN · October 23, 2014

Accident · Minor injuriesData collectionFinal report
Date
October 23, 2014, 14:30 local (19:30 UTC)
Place
White Bear Lake, MN
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N549CTFlight Design CTLSi
Defining event
Landing: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report June 15, 2016
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Minneapolis FSDO
FAA report
20141023018429A
Case key
90338

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 exceedance of the airplane's critical angle of attack during the landing, which resulted in an inadvertent aerodynamic stall, a hard landing, and a nose over.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotFlight Design CTLS: 22 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Capability exceededFlight Design CTLS: 4 casesAll aircraft: 990 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 reported that he was conducting touch-and-go landings. During his second approach, he reported that the airplane flew over the runway at 60 knots, he stalled the airplane too high, and the airplane impacted the runway "very hard" and bounced high. He reported that instead of executing a go-around, he tried to regain control of the airplane and after several bounces, the nose landing gear collapsed, and the airplane nosed over. The airplane sustained substantial damage to the fuselage and firewall. The pilot verified that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. As a safety recommendation, the pilot reported that he could have executed a go-around. The Federal Aviation Administration has published the Airplane Flying Handbook FAA-H-8083-3A (2004). This handbook discusses the roundout portion when landing and states in part: Sometimes when the airplane appears to temporarily stop moving downward, the roundout has been made too rapidly and the airplane is flying level, too high above the runway. Continuing the roundout would further reduce the airspeed, resulting in an increase in angle of attack to the critical angle. This would result in the airplane stalling and dropping hard onto the runway. To prevent this, the pitch attitude should be held constant until the airplane decelerates enough to again start descending. Then the roundout can be continued to establish the proper landing attitude. This procedure should only be used when there is adequate airspeed. It may be necessary to add a slight amount of power to keep the airspeed from decreasing excessively and to avoid losing lift too rapidly. It is recommended that a go-around be executed any time it appears the nose must be lowered significantly or that the landing is in any other way uncertain.

Factual narrative

The pilot reported that he was conducting touch-and-go landings. During his second approach, he reported that the airplane flew over the runway at 60 knots, he stalled the airplane too high, and the airplane impacted the runway "very hard" and bounced high. He reported that instead of executing a go-around, he tried to regain control of the airplane and after several bounces, the nose landing gear collapsed, and the airplane nosed over. The airplane sustained substantial damage to the fuselage and firewall. The pilot verified that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. As a safety recommendation, the pilot reported that he could have executed a go-around. The Federal Aviation Administration has published the Airplane Flying Handbook FAA-H-8083-3A (2004). This handbook discusses the roundout portion when landing and states in part: Sometimes when the airplane appears to temporarily stop moving downward, the roundout has been made too rapidly and the airplane is flying level, too high above the runway. Continuing the roundout would further reduce the airspeed, resulting in an increase in angle of attack to the critical angle. This would result in the airplane stalling and dropping hard onto the runway. To prevent this, the pitch attitude should be held constant until the airplane decelerates enough to again start descending. Then the roundout can be continued to establish the proper landing attitude. This procedure should only be used when there is adequate airspeed. It may be necessary to add a slight amount of power to keep the airspeed from decreasing excessively and to avoid losing lift too rapidly. It is recommended that a go-around be executed any time it appears the nose must be lowered significantly or that the landing is in any other way uncertain.

Aircraft

Registration
N549CT
Reported as
Flight Design CTLSi
Category
Airplane
Serial number
F-13-03-09
Built
2014
Engine
Rotax 912ULSi, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Special light-sport (Special)
Last inspection
Annual · July 1, 2015
Departed
6MN9 · White Bear Lake, MN
Destination
6MN9 · White Bear Lake, MN
Airport
6MN9 · Benson, runway 30, 2,000 × 75 ft, grass/turf
Equipment
Auto-pilot, Angle of attack indicator, Airframe parachute, 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
75
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Sport pilot
Last flight review
October 19, 2015
Seat
Left
Flight hours
150 total · 18 in this make and model · 83 as pilot in command · 16 in the last 90 days · 10 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
240° at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
66 °F, dew point 54 °F
Altimeter
29.95 inHg
Observed at
KANE, 9 nm away

Docket · 2

The files NTSB released with the investigation on June 1, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.0 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.