# NTSB CHI07CA105: Pavliga Hatz CB-1, N899P, Buffalo, MN, April 15, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: April 15, 2007, 18:40 local (23:40 UTC) - Place: Buffalo, MN - Coordinates: 45.158889, -93.843055 - Nearby events: https://openairdocs.org/map.md?lat=45.1589&lon=-93.8431&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report June 27, 2007 - Report: Approved by Office Director - Parties: Federal Aviation Administration, Minneapolis FSDO - NTSB case key (mKey): 65748 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI07CA105 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65748/pdf - Page: https://openairdocs.org/ntsb/CHI07CA105 ## Probable cause The loss of engine power due to the carburetor fuel flow valve becoming stuck in the closed position, which resulted in fuel starvation. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, approach - vfr pattern - downwind - fuel system,carburetor - flow restricted (cause) - fluid,fuel - starvation (cause) - Forced landing, emergency descent/landing - In flight collision with terrain/water, emergency descent/landing - terrain condition - ditch ## Analysis The airplane impacted terrain during a forced landing following a total loss of engine power. The pilot reported that during the preflight inspection he visually inspected the fuel tank and no fuel contamination was detected from a gascolator fuel sample. The pilot performed three landings, but while on the downwind leg for the fourth landing "the engine abruptly stopped." Best glide speed was established and the airplane was maneuvered toward the runway for landing. The pilot reported that he "confirmed that carb heat was off and mixture full, rocked the wings and switched mags off and then on, in an attempt to restart the engine." The airplane "just cleared" the perimeter fence and touched down short of the runway in a ditch. The right main gear subsequently separated and the airplane rolled inverted. An on-scene inspection of the airplane indicated that there was sufficient fuel available in the fuel tank and a gascolator fuel sample was free of water and particulate contamination. Examination of the carburetor revealed that the carburetor fuel flow valve would stick in the closed position. ## Factual narrative The airplane impacted terrain during a forced landing following a total loss of engine power. The pilot reported that during the preflight inspection he visually inspected the fuel tank and no fuel contamination was detected from a gascolator fuel sample. The pilot performed three landings, but while on the downwind leg for the fourth landing "the engine abruptly stopped." Best glide speed was established and the airplane was maneuvered toward the runway for landing. The pilot reported that he "confirmed that carb heat was off and mixture full, rocked the wings and switched mags off and then on, in an attempt to restart the engine." The airplane "just cleared" the perimeter fence and touched down short of the runway in a ditch. The right main gear subsequently separated and the airplane rolled inverted. An on-scene inspection of the airplane indicated that there was sufficient fuel available in the fuel tank and a gascolator fuel sample was free of water and particulate contamination. Examination of the carburetor revealed that the carburetor fuel flow valve would stick in the closed position. ## Aircraft - Registration: [N899P](https://openairdocs.org/aircraft/N899P), registered now, S/N 313, built 1989 (OpenAirDocs) - Reported make and model: Pavliga Hatz CB-1 - Registry model: [Pavliga Frank M HATZ CB-1](https://openairdocs.org/model/pavliga-frank-m-hatz-cb-1) (registry code 05616DX) (OpenAirDocs) - Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 313 - Airframe hours: 668 - Engines: Lycoming O-235-C1 115 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, November 1, 2006 - Departed: CFE, Buffalo, MN - Destination: CFE - Airport: CFE, Buffalo Municipal Airport, runway 35, 2,600 × 60 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; injuries: none; private; airplane ratings: single-engine land, single-engine sea; medical: class 3, with waivers/limitations; last flight review February 1, 2007; seat: rear; flight hours: 716 total, 140 in this make and model, 660 as pilot in command, 18 in the last 90 days, 8 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °F, dew point 41 °F - Altimeter: 29.98 inHg - Observed at: CFE ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20070415826499A](https://openairdocs.org/incident/20070415826499A), Apr 15, 2007: Pavlig CB1, Buffalo, MN, Substantial damage. (-23) The aircraft's engine abruptly quit in the traffic pattern, on the downwind leg, slightly beyond the 180. The pilot immediately turned towards the… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.