DEN07LA150 · Beech 35-B33
Beech 35-B33 · Accident: partial loss of engine power (non-mechanical) during initial climb
From Tucumcari Municipal Airport (TCC) to Muskogee-Davis Regional Airport (MKO)
Event
- NTSB case
- DEN07LA150
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Beech 35-B33
- Aircraft type
- Beechcraft 35
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N2133B
- Operator
- Gary C. Mayer · private individual
- Onboard fatalities
- Unknown
- Route
- From Tucumcari Municipal Airport (TCC), Tucumcari, NMTo Muskogee-Davis Regional Airport (MKO), Muskogee, OK
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Initial climb
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Partial loss of engine power (non-mechanical)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft performance, climb capability › Other
- Pilot in command › Mixture, incorrect
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
Prior to departure, the airplane's fuel tanks were topped off with fuel, and the pilot "thought he adjusted his mixture control." The pilot reported that during the takeoff, he noticed no problems. During the gear retraction, the engine started to "act up." The pilot stated that the "act up" was not a sputtering or unusual noise, but that "the engine wasn't making the power that [I] expected." The pilot adjusted the mixture control to different lean and rich positions, with no change to engine power noted. The pilot then attempted a forced landing to a nearby interstate highway; however due to vehicle traffic, the pilot executed a forced landing to a field. Subsequently, the airplane touched down in a field with the landing gear retracted approximately 1 1/2 miles south of airport. Examination of the airplane revealed the right side of the fuselage was crushed upward and aft, and the right wing was bent. The propeller assembly and crankshaft propeller flange were separated from the crankshaft. The engine had accumulated 250 hours since major overhaul. Examination of the engine revealed mechanical continuity throughout the engine when the crankshaft was manually rotated. Continuity was established for the airframe and engine fuel system. The magnetos and wire harnesses were functionally tested and no anomalies were noted. Continuity was established from the cockpit to the throttle assembly, propeller governor, and mixture control. No anomalies were noted that would have precluded normal engine operation prior to impact.
Probable cause
the pilot's failure to properly set the mixture prior to departing in high density altitude conditions, which resulted in a partial loss of engine power, and degraded climb capability.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN07LA150
- Event ID
- 20070906X01318
- Case number
- DEN07LA150
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, coordinates. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 7e52aa1a439ecf6ce96029743b0f412d67ad81d9d525cda32364deae1ff84664; retrieved 2026-09-21T08:44:46.946Z.