CEN11LA352

NTSB accident investigation · Aero Commander 100-180 · Athens, OH · May 21, 2011

Accident · No injuriesLimited investigationFinal report
Date
May 21, 2011, 15:45 local (19:45 UTC)
Place
Athens, OH
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N4016XAero Commander 100-180
Defining event
Landing-flare/touchdown: Hard landing
Weather
Visual (VMC) · Day
Status
Completed · report August 22, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Columbus FSDO
FAA report
20110521009319A
Case key
79174

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 failure to maintain adequate airspeed in the flare which resulted in a stall and a hard landing.

Findings · 5

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.

Performance/control parameters: landing flareAircraft › Aircraft oper/perf/capability · Not attained/maintainedAero Commander 100-180: 1 caseAll aircraft: 1,285 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedAero Commander 100-180: 2 casesAll aircraft: 1,681 casesProbable cause
Landing gear systemAircraft › Aircraft systems · Capability exceededAero Commander 100-180: 1 caseAll aircraft: 113 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

The pilot reported that he flew a stable approach and as he flared the airplane, a wind gust raised the nose and slowed the airplane. He added engine power, but the airplane descended and impacted the runway. The right main landing gear collapsed and the airplane skidded off the right side of the runway resulting in a collapsed nose gear and a propeller strike. A postaccident examination of the airplane revealed no preimpact mechanical anomalies, and substantial damage was noted to the firewall and fuselage. Witnesses reported that the airplane was on a high, steep, and fast approach before the landing flare and touchdown occurred near mid-field. The airplane appeared to "balloon" during the flare and stall prior to impact with the runway.

Factual narrative

On May 21, 2011, about 1545 eastern daylight time, an Aero Commander 100-180, N4016X, sustained substantial damage during a hard landing at the Ohio University Airport-Snyder Field (UNI), Athens, Ohio. The private pilot and three passengers were not injured. The airplane was registered to and operated by the pilot as a 14 Code of Federal Regulations Part 91 personal flight. Visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The airplane departed from the Perry County Airport (I86), New Lexington, Ohio, about 1500. The pilot reported that the flight had proceeded normally to UNI. He entered the traffic pattern and established the airplane on final approach to runway 25 (5,600 feet by 100 feet, asphalt). He flew a stable approach and flared the airplane. He reported that as the airplane settled to the runway, a "wind gust raised the nose" and slowed the airplane. He added power but the airplane "dropped a short distance" to the runway. He reported that "the contact was not hard but resulted in a failure and collapse of the right main gear." The airplane skidded off the right side of the runway resulting in a collapsed nose gear and a propeller strike. The firewall and fuselage sustained substantial damage. Federal Aviation Administration (FAA) inspectors examined the airplane on the ramp at UNI. The flight controls were checked and they exhibited continuity. The propeller tips were bent aft and exhibited scratches consistent with a ground strike while power was applied. The throttle, carburetor heat, and mixture controls were all full in. The lower firewall was bent. The right main landing gear was collapsed. The lower part of the right landing gear was bent outwards approximately 90 degrees to the upper part of the landing gear. The nose landing gear collapsed and was bent aft and to the left. The flaps were found in the fully retracted position. The FAA inspectors reported that witnesses stated that the airplane was on a high, steep, and fast approach path with the landing flare and touchdown occurring near mid-field. The airplane appeared to "balloon" during the flare. Two witnesses stated that the airplane looked like it stalled and dropped hard onto the runway. One witness took photographs of the airplane as it was landing. One photograph showed the airplane nearing mid-field with the flaps in the up position. The photograph of the airplane on the side of the runway also showed the flaps in the up position. The airplane's maximum gross weight was 2,475 pounds. The calculated weight of the accident airplane was about 2,345 pounds. The stall speed at maximum gross weight, flaps up, is 63 mph, with flaps down, 60 mph. The 1530 surface weather observation at UNI was: winds variable at 4 knots gusting to 7 knots; 10 miles visibility; clouds scattered at 4,600 feet; temperature 28 degrees Celsius; dew point 7 degrees Celsius; altimeter 30.00 inches of mercury.

Aircraft

Registration
N4016X
Reported as
Aero Commander 100-180
Category
Airplane
Serial number
5148
Airframe hours
2,169
Engine
Lycoming O-360-A2F, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Alder William D III
Registered owner
Alder William D III
Airworthiness certificate
Standard, Normal
Departed
I86 · New Lexington, OH
Destination
UNI · Athens, OH
Airport
UNI · Ohio University Airport, runway 25, 5,600 × 100 ft, concrete

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
70
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
December 10, 2010
Seat
Left
Flight hours
178 total · 78 in this make and model · 119 as pilot in command · 4 in the last 90 days · 3 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 4 knots, gusting 7
Visibility
10 statute miles
Lowest ceiling
None
Temperature
82 °F, dew point 45 °F
Altimeter
30.00 inHg
Observed at
UNI

Docket · 8

The files NTSB released with the investigation on June 22, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 7.3 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.