DEN86LA236 · Mayala DRAGONFLY
Mayala DRAGONFLY · Accident: partial loss of engine power (mechanical failure) on approach
From Billings Logan International Airport (BIL) to an unrecorded destination
Event
- NTSB case
- DEN86LA236
- 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
- 0
- 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
Mayala DRAGONFLY
- Aircraft type
- Mayala DRAGONFLY
- 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
- N4478V
- Operator
- Hjalmer A. Mayala · private individual
- Onboard fatalities
- Unknown
- Route
- From Billings Logan International Airport (BIL), Billings, MTTo not recorded
- 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
- Approach · VFR pattern final
- 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 (mechanical failure)
- 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
- Pilot in command › Throttle/power control, initiated
- Throttle/power lever, cable › Bent
- Throttle/power lever, cable › Binding(mechanical)
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE ACFT WAS ON FINAL APCH AFTER COMPLETING A X-COUNTRY FROM BILLINGS, MT, WHEN THE ACCIDENT OCCURRED. THE PLT STATED THE ACFT WAS LOW AFTER INTERCEPTING THE VASI SO POWER WAS ADDED; HOWEVER, THE ENG DID NOT RESPOND. THE ACFT STRUCK A SMALL HILL 300 FT SHORT OF RWY. INSPECTION FOUND NO EVIDENCE OF MECHANICAL FAILURE OF THE ENGINE BUT THE UPPER CABLE FROM THROTTLE CONTROL-TO-CARBURETOR LINKAGE WAS BENT AND THE WALKING BEAM SHOWED EVIDENCE OF BINDING. ADDITIONALLY, NO EVIDENCE OF CABLE LUBRICATION WAS NOTED.
Verbatim NTSB analysis from the NTSB dataset
Sources
NTSB record DEN86LA236
- Event ID
- 20001213X34465
- Case number
- DEN86LA236
- 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: local date, investigation status. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 1986-08-25.
- API snapshot SHA-256: 3295b777e1303ca5932637047b85ecf4f4474604dd586b468a68a15a004985c7; retrieved 2026-09-21T16:52:19.688Z.