- Date
- January 4, 1985, 18:25 local (Jan 5, 1985, 01:25 UTC)
- Place
- Billings, MT
- Injuries
- 1 minor, 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N6750CBeech B36TC
- Weather
- Visual (VMC) · Night/bright
- Status
- Completed
- Report
- Approved by Office Director
- FAA report
- 19850104001279A
- Case key
- 16624
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
Plt used cannula connected to portable oxygen system during climb starting at 11,000 ft MSL. At FL 170 plt switched to a mask connected to acft oxygen ststem. At FL 250, plt complained of stomach pains for aprx 1/2 hr. Plt then stated to his son that his oxygen smelt bad, the mask was awkward to use and it fit poorly. At this time the plt used the mask and cannula together. The acft oxygen system was checked and indicated a positive flow with a bottle pressure of 1500 PSI. Plt then began showing signs of hypoxia and subsequently drifted in and out of consiousness. Plts son took over controls, declared an emergency and flew the acft until final apch when the plt took control of acft. Plt dived acft on short final and son pulled back on yoke. Acft contacted ground short of the rwy. Inspection of the acft oxygen system revealed no mechanical malfunction, however, the oxygen bottle reportedly had an aprx dew point of -35 deg f. oxygen used for aviation is required to have a dew point of -83 deg f or less.
Aircraft
- Registration
- N6750C
- Reported as
- Beech B36TC
- Category
- Airplane
- Serial number
- 393
- Airframe hours
- 218
- Engine
- Continental TSIO-520-UB, 300 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Business · Part 91
- Registered owner
- William Nibbelink
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · September 20, 1984 · 20 hours before
- Departed
- Seattle, WA
- Destination
- BIL · Billings, MT
- Flight plan
- IFR
- Airport
- BIL · Logan, runway 22, 5,704 × 150 ft, asphalt
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
- 46
- Certificate
- Private
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
Weather
- Conditions
- Visual (VMC) · Night/bright
- Wind
- 220° at 17 knots
- Visibility
- 20 statute miles
- Lowest ceiling
- None
- Temperature
- 50 °F
- Altimeter
- 30.00 inHg
- Observed at
- BIL
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N6750C · 1
Matched to the same aircraft by N-number and date.