CEN13CA005

NTSB accident investigation · Piper PA-24-250 · Colorado Springs, CO · October 5, 2012

Accident · No injuriesData collectionFinal report
Date
October 5, 2012, 14:44 local (20:44 UTC)
Place
Colorado Springs, CO
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N6661PPiper PA-24-250
Defining event
Enroute: Structural icing
Weather
Visual (VMC) · Day
Status
Completed · report December 19, 2012
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20121005022279A
Case key
85267

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 pilot’s failure to maintain airspeed during the landing with known structural icing, which resulted in the airplane’s stall. Contributing to the accident was the pilot’s failure to divert to an area where conditions were not conducive to icing.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-24-250: 34 casesAll aircraft: 9,295 casesProbable cause
Temp/humidity/pressure: conducive to structural icingEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomePiper PA-24-250: 1 caseAll aircraft: 103 cases
Action: lack of actionPersonnel issues › Action/decision · PilotPiper PA-24-250: 4 casesAll aircraft: 792 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-24-250: 12 casesAll aircraft: 1,681 casesProbable cause
Temp/humidity/pressure: conducive to structural icingEnvironmental issues › Conditions/weather/phenomena · Effect on equipmentPiper PA-24-250: 1 caseAll aircraft: 103 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

An air traffic controller provided the pilot with an altitude at which to cruise, but the airplane began accumulating structural icing. The pilot requested a lower altitude, but the altitude was still in clouds and the airplane continued to accumulate ice; the controller was unable to provide an even lower altitude to the pilot due to the minimum vectoring altitude. The pilot then visually acquired the airport, at which point the airplane had accumulated 1 1/2 to 2 inches of structural icing. The pilot kept the airplane's speed up during the pattern; however, on short final he reduced power and the airplane stalled about 105 mph. The airplane impacted terrain short of the runway and sustained substantial left and right wing damage. He reported that there were no mechanical malfunctions with the airplane during the flight that would have precluded normal operations. The pilot indicated that he should have obtained the weather conditions at his destination in flight, because they had worsened, or he should have sought an ice-free solution, which may have been behind his flight path.

Factual narrative

The pilot was given an altitude to fly by an air traffic controller where the pilot saw that the airplane collected one and one-half to two inches of structural ice. The pilot requested a lower altitude and the controller was unable to accommodate the pilot due to the minimum vectoring altitude. The pilot kept the airplane's speed up during the pattern. However, on short final he reduced power and the airplane stalled about 105 mph. The airplane impacted terrain short of the runway and sustained substantial left and right wing damage. He reported that there were no mechanical malfunctions with the airplane during the flight. The pilot's safety recommendation indicated that he should have sought an ice free solution which would have been behind his ultimate flight path.

Aircraft

Registration
N6661P
Reported as
Piper PA-24-250
Category
Airplane
Serial number
24-1784
Airframe hours
5,117.6
Engine
Lycoming O-540-A1C5, 250 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Six One Papa LLC
Registered owner
Six One Papa LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 9, 2012
Departed
CPS · Cahokia, IL
Destination
FLY · Colorado Springs, CO
Flight plan
IFR
Airport
FLY · Meadow Lake Airport, runway 15, 6,000 × 60 ft, asphalt

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
58
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
September 14, 2012
Seat
Left
Flight hours
816 total · 430 in this make and model · 741 as pilot in command · 11 in the last 90 days · 11 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
130° at 6 knots
Visibility
10 statute miles
Lowest ceiling
1,800 ft overcast
Temperature
39 °F, dew point 30 °F
Altimeter
30.19 inHg
Observed at
FLY

Docket · 1

The files NTSB released with the investigation on October 25, 2012, 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.

Other investigations on N6661P · 1

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