- Date
- February 24, 2017, 18:15 local (Feb 25, 2017, 00:15 UTC)
- Place
- Waukesha, WI
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Approach
- Aircraft
- N255BCCessna 340A
- Defining event
- Approach-IFR final approach: Loss of control in flight
- Weather
- Instrument (IMC) · Dusk
- Status
- Completed · report April 4, 2017
- Report
- Approved by Office Director
- NTSB office
- Central Region
- Parties
- Federal Aviation Administration
- FAA report
- 20170224002979A
- Case key
- 94793
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 decision to fly in in conditions conducive to structural icing and her subsequent failure to maintain airplane control during the instrument approach.
Findings · 6
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.
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
Before the positioning flight, the airline transport pilot monitored the weather and noticed the weather conditions were deteriorating near the time of the planned departure. The weather conditions included low visibility, freezing drizzle, and mist. In an effort to reduce the time in the deteriorating weather conditions, the pilot performed some before takeoff checks while the airplane was in the hangar. During the pilot's "haste" to preflight and take off, she inadvertently selected the wrong switch for windshield heat. While on the instrument approach to the runway in night conditions, the pilot had no forward visibility due to ice accumulation on the windshield. The pilot executed a missed approach and contacted an instructor pilot at the departure airport to confirm the location of the windshield heat switch. The pilot then activated the windshield heat switch and enough ice had melted for the pilot to conduct another approach. During the approach, the pilot increased the airspeed due to "carrying a lot of ice." On short final approach, the airplane descended below the glidepath due to the ice accumulation. Subsequently, the airplane contacted the terrain short of the runway and then "skipped" onto the runway. The airplane came to rest upright and off the runway surface. Examination of the airplane revealed substantial damage to the left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.
Factual narrative
Prior to the positioning flight, the pilot monitored the weather and noticed the weather conditions were deteriorating near the time of the planned departure. The weather conditions included low visibility, freezing drizzle, and mist. In an effort to reduce the time in the deteriorating weather conditions, the pilot performed some before takeoff checks while the airplane was in the hangar. During the pilot's "haste" to preflight and takeoff, she inadvertently selected the wrong switch for windshield heat. While on the instrument approach to the runway in night conditions, the pilot had no forward visibility due to ice accumulation on the windshield. The pilot executed a missed approach and contacted an instructor pilot at the departure airport to confirm the location of the windshield heat switch. The pilot then activated the windshield heat switch and enough ice had melted for the pilot to conduct another approach. During the approach, the pilot increased the airspeed due to "carrying a lot of ice." On short final approach, the airplane descended below the glide path due to the ice accumulation. Subsequently, the airplane contacted the terrain short of the runway, and "skipped" onto the runway. The airplane came to rest upright and off the runway surface. Examination of the airplane revealed substantial damage to the left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.
Aircraft
- Registration
- N255BC
- Reported as
- Cessna 340A (A)
- Category
- Airplane
- Serial number
- 340A0908
- Built
- 1979
- Airframe hours
- 5,644
- Engines
- Cont Motor TSIO-520 NB, 335 horsepower, reciprocatingCont Motor TSIO-520 NB, 335 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Positioning · Part 91
- Operator
- Signicast LLC
- Registered owner
- Signicast LLC
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · August 12, 2016
- Departed
- UNU · Juneau, WI
- Destination
- UES · Waukesha, WI
- Flight plan
- IFR
- Airport
- UES · Waukesha County Airport, runway 10, 5,849 × 100 ft, asphalt
- 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
- 55
- Injuries
- None
- Certificates
- Flight instructor, Airline transport
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, With waivers/limitations
- Last flight review
- August 5, 2016
- Seat
- Left
- Restraint
- 3-point
- Flight hours
- 10,200 total · 200 in this make and model · 10,200 as pilot in command · 60 in the last 90 days · 4.5 in the last 24 hours
Weather
- Conditions
- Instrument (IMC) · Dusk
- Wind
- 320° at 8 knots
- Visibility
- 2.5 statute miles
- Lowest ceiling
- 700 ft overcast
- Temperature
- 28 °F, dew point 28 °F
- Altimeter
- 29.54 inHg
- Icing
- Rime
- Observed at
- UES
Docket · 1
The files NTSB released with the investigation on March 16, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 381 KB 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.