Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Missoula, Montana 59801
Friday, April 10, 1992 15:59 MDT
NTSB Narrative Summary Released at Completion of Accident
THE PILOT AND PILOT RATED PASSENGER (RIGHT SEAT) DEPARTED IN THE PA-23 AND CLIMBED TO 11000 FEET ON A LOCAL ROUND ROBIN FLIGHT. THE AIRCRAFT WAS NOT EQUIPPED WITH WING OR PROPELLER DEICE/ANTI ICE SYSTEMS. MISSOULA REPORTED SEVERAL SCATTERED, BROKEN AND OVERCAST CLOUD LAYERS BELOW 11000 FEET DURING THE AFTERNOON AND THE SURFACE TEMP PEAKED AT 44 DEGREES F. AT 11000 FEET THE PILOTS ENCOUNTERED A VIBRATION AND LOSS OF LEFT ENGINE POWER AND INITIATED A RETURN TO MISSOULA FOR LANDING. UNABLE TO MAINTAIN ALTITUDE WITH PARTIAL POWER A FORCED LANDING WAS EXECUTED SHORT OF RUNWAY 25 AT THE MISSOULA AIRPORT. ALTHOUGH AN ATTEMPT WAS MADE TO LOWER THE LANDING GEAR PRIOR TO THE FORCED LANDING THE NOSE LANDING GEAR COLLAPSED DURING ROLLOUT WHEN IT STRUCK A GOPHER HOLE. AIRPORT ARFF PERSONNEL OBSERVED ICE DETACHING FROM THE AIRCRAFT WING(S) FOLLOWING THE ACCIDENT AND FAA PERSONNEL INSPECTING THE AIRCRAFT SUBSEQUENT TO THE ACCIDENT REPORTED THAT THE LEFT INDUCTION AIR FILTER WAS HEAVILY SOAKED WITH WATER.
NTSB Probable Cause Narrative
PARTIAL BLOCKAGE OF THE LEFT ENGINE INDUCTION AIR FILTER, INABILITY TO MAINTAIN THE PROPER RATE OF DESCENT, AND DELAYED EXTENSION OF THE LANDING GEAR. FACTORS CONTRIBUTING TO THE ACCIDENT WERE ICING CONDITIONS, WING ICE, AND ROUGH/UNEVEN TERRAIN.
Event Information
| Type of Event | Accident |
| Event Date | 4/10/1992 |
| Event Day of the Week | Friday |
| Time of Event | 1559 |
| Event Time Zone | Mountain Daylight Time |
| Event City | MISSOULA |
| Event State | MONTANA |
| Event Country | -- |
| Zipcode of the event site | 59801 |
| Event Date Year | 1992 |
| Event Date Month | 4 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | |
| Event Location Nearest Airport ID | |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1550 Mountain Daylight Time |
| Direction of event from weather observation facility (degrees) | 250 |
| Weather Observation Facility ID | MSO |
| Elevation of weather observation facility | 3201 |
| Distance of event from weather observation facility (units?) | 1 |
| Time Zone of the weather observation | MDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 3200 |
| Lowest Non-Ceiling Height | 1400 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 15 |
| Air Temperature at event time (in degrees celsius) | 7 |
| Dew Point at event time (in degress fahrenheit) | 4 |
| Wind Direction (degrees magnetic) | 0 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 0 |
| Wind Velocity Indicator | Calm |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | 1 |
| Intensity of Precipitation | Light |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 2107 |
| NTSB Notification Source | -- |
| NTSB Notification Date | -- |
| NTSB Notification Time | 0 |
| Fiche Number and/or location -used to find docket information | 46816 |
| Date of most recent change to record | Dec 11 2000 2:52PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N3494P |
| NTSB Number | SEA92LA072 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | PIPER |
| Aircraft Model | PA-23-160 |
| Aircraft Series Identifier | PA-23-160 |
| Aircraft Serial Number | 23-1470 |
| Certified Max Gross Weight | 3800 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 4 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Aug 15 1991 12:00AM |
| Airframe hours since last inspection | 227 |
| Airframe Hours | 5312 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | PEARSON, ERIK & CROW, CHARLES |
| Aircraft Owner Street Address | 4627 WATT LANE |
| Aircraft Owner City | STEVENSVILLE |
| Aircraft Owner State | MT |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 59870 |
| Operator is an individual? | -- |
| Operator Name | PEARSON, ERIK & CROW, CHARLES |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | 4627 WATT LANE |
| Operator City | STEVENSVILLE |
| Operator State | MT |
| Operator Country | |
| Operator Zip code | 59870 |
| Operator Code | |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Personal |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | 32S |
| Departure City | STEVENSVILLE |
| Departure State | MT |
| Departure Country | |
| Departure Time | 1425 |
| Departure Time Zone | MDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Landing |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 0 |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |