CEN16LA184

NTSB accident investigation · Cessna 150F · Ponca City, OK · May 1, 2016

Accident · Serious injuriesLimited investigationFinal report
Date
May 1, 2016, 11:30 local (16:30 UTC)
Place
Ponca City, OK
Injuries
1 serious, 1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N8619GCessna 150F
Defining event
Landing-flare/touchdown: Part(s) separation from AC
Weather
Visual (VMC) · Day
Status
Completed · report July 20, 2017
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20160501008409A
Case key
93176

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

Maintenance personnel's improper installation of the elevator bolt, which resulted in a loss of elevator control during landing.

Findings · 3

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.

Maintenance: repairPersonnel issues › Task performance · Maintenance personnelCessna 150F: 1 caseAll aircraft: 99 casesProbable cause
Inspection: post maintenance inspectionPersonnel issues › Task performance · Maintenance personnelCessna 150F: 1 caseAll aircraft: 57 casesProbable cause
Flight control system: elevator control systemAircraft › Aircraft systems · Incorrect service/maintenanceCessna 150F: 1 caseAll aircraft: 74 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 private pilot stated that, during the landing flare at the conclusion of a local flight, the airplane's nose "shot up drastically." The pilot "gently" pressed forward on the controls to lower the nose, and the airplane pitched down and impacted the runway. Examination of the airplane revealed that a bolt that attached the left elevator to the control system was not installed, and the FAA inspector reported that the bolt was found undamaged inside the elevator tip. According to the pilot, maintenance personnel had recently removed the left elevator, and it is likely that they failed to properly secure the bolt when they reinstalled the elevator.

Factual narrative

On May 1, 2016, about 1130 central daylight time, a Cessna 150F, N8619G, experienced a loss of pitch control during landing flare and impacted runway 35 at Ponca City Regional Airport, Ponca City, Oklahoma. The airplane sustained substantial damage to the firewall. The pilot sustained serious injuries and the passenger was uninjured. The airplane was operated by the pilot under 14 Code of Federal Regulations Part 91 as a personal flight that was not operating on a flight plan. Visual meteorological conditions prevailed at the time of the accident. The local flight originated from PNC about 1045. The pilot stated that he performed a "full" preflight inspection of the airplane prior to departing for a pleasure flight. The flight returned without incident for an approach for landing to the airport. During landing flare on runway 35 and about 1-2 feet above runway, the airplane "shot up drastically". The airplane climbed about 10-20 feet, the pilot "gently" applied forward control pressure on the control yoke, and the airplane "instantly" pitched down and impacted the runway. The pilot stated that as he waited for an ambulance, he saw the left elevator was separated from the horizontal stabilizer. An airplane maintenance record entry dated November 9, 2015, shows that an annual inspection had been performed and that the bearing in the elevator bearing crank assembly was "reset" by an airframe and powerplant mechanic with inspection authorization. The airplane accumulated about 25 hours of flight time after the annual inspection. Post-accident examination of the airplane by a Federal Aviation Administration (FAA) inspector revealed that a bolt that links the left elevator to the control system was missing. The bolt was found inside the left elevator tip. The FAA Inspector reported that there was an improper reinstallation of the elevator, which resulted in it coming loose.

Aircraft

Registration
N8619G
Reported as
Cessna 150F
Category
Airplane
Serial number
15062719
Built
1965
Airframe hours
3,234.9
Engine
Continental O-200-A, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Pilot
Registered owner
Harbor Aviation LLC
Airworthiness certificate
Standard, Utility
Last inspection
Annual · November 9, 2015 · 25 hours before
Departed
PNC · Ponca City, OK
Destination
PNC · Ponca City, OK
Airport
PNC · Ponca City Regional Airport, runway 35, 7,201 × 150 ft, concrete
Equipment
Stall warning system

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
52
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left
Restraint
Lap only
Flight hours
550 total · 540 in this make and model · 30 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
300° at 10 knots, gusting 18
Visibility
10 statute miles
Lowest ceiling
None
Temperature
55 °F, dew point 41 °F
Altimeter
30.10 inHg
Observed at
PNC

Docket · 3

The files NTSB released with the investigation on May 11, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.5 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.