Davis Field Airport
Aircraft Accident/Incident Report

Muskogee, Oklahoma 74402
Saturday, January 5, 1991 20:43 CST

NTSB Narrative Summary Released at Completion of Accident

A PLT (WHOSE INSTRUMENT CURRENCY COULD NOT BE DTRMD) TOOK OFF AT NGT IN IMC. SHORTLY AFTER TAKEOFF, THE ACFT CRASHED ABT 1.5 MI FM THE DEP END OF THE RWY. THERE WAS EVIDENCE THAT IT IMPACTED IN AN 85 DEG RGT BANK, NOSE DWN ATTITUDE AT HI SPEED. NO PREIMPACT PART FAILURE WAS FND DRG THE INVESTIGATION; HOWEVER, DRG A PRE-PURCHASE INSPN ON 10/16/90, SVRL DISCREPANCIES WERE NOTED. THESE INCLUDED AN INOP FLT DRCTR, AN AUTOPLT MALFUNCTION & A MISRIGGED FLT CTL SYS THAT ALLOWED THE CTRL WHEEL TO INDC A LEFT TURN WHEN THE ACFT WAS IN LVL FLT. THERE WAS NO RECORD OF THESE BEING REPAIRED. RECORDS SHOWED THE PITOT-STATIC SYS WAS LAST TESTED ON 3/24/88. THE PLT WAS TAKING SINE-AID & TYLENOL FOR A CHRONIC SINUS INFECTION. ALTHOUGH TOX CHECKS INDCD THE PRESENCE OF 50.7 UG/ML OF PSEUDOEPHEDRINE & 36.4 UG/ML OF ACETAMINOPHEN IN THE PLT'S URINE, NONE WAS FOUND IN HIS BLOOD. THE SINUS COND COULD HAVE AFFECTED THE PLT'S BALANCE & EQUILIBRIUM.

NTSB Probable Cause Narrative

THE PILOT'S FAILURE TO MAINTAIN CONTROL OF THE AIRCRAFT, DUE TO SPATIAL DISORIENTATION. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS, ADVERSE WEATHER CONDITIONS, AND THE PILOT'S PHYSICAL IMPAIRMENT FROM THE CHRONIC SINUS INFECTION.

Event Information

Type of Event Accident
Event Date 1/5/1991
Event Day of the Week Saturday
Time of Event 2043
Event Time Zone Central Standard Time
Event City MUSKOGEE
Event State OKLAHOMA
Event Country --
Zipcode of the event site 74402
Event Date Year 1991
Event Date Month 1
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude
Event Location Longitude
Event Location Airport DAVIS FIELD
Event Location Nearest Airport ID MKO
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 612
Weather Briefing Completeness Full
Investigator's weather source Weather Observation Facility
Time of the weather observation 2050 Central Standard Time
Direction of event from weather observation facility (degrees) 330
Weather Observation Facility ID TUL
Elevation of weather observation facility 677
Distance of event from weather observation facility (units?) 40
Time Zone of the weather observation CST
Lighting Conditions Night/Dark
Lowest Ceiling Height 300
Lowest Non-Ceiling Height 0
Sky/Lowest/Cloud Conditions Unknown
Sky Condition for Lowest Ceiling Overcast
Visibility Runway Visual Range (Feet) 0
Visibility Runway Visual Value (Statute Miles) 0
Visibility (Statute Miles) 0
Air Temperature at event time (in degrees celsius) 2
Dew Point at event time (in degress fahrenheit) 2
Wind Direction (degrees magnetic) 10
Variable Wind Indicator Unknown
Wind Speed (knots) 10
Wind Velocity Indicator Unknown
Wind Gust Indicator Not Gusting
Wind Gust (knots) 0
Altimeter Setting at event time (in. Hg) 30.3
Density Altitude (feet) --
Intensity of Precipitation Light
METAR weather report --
Event Highest Injury Fatal
On Ground, Fatal Injuries 0
On Ground, Minor Injuries 0
On Ground, Serious Injuries 0
Injury Total Fatal 6
Injury Total Minor --
Injury Total None --
Injury Total Serious --
Injury Total All 6
Investigating Agency NTSB
NTSB Docket Number (internal use) 1212
NTSB Notification Source --
NTSB Notification Date Jan 5 1991 12:00AM
NTSB Notification Time 2150
Fiche Number and/or location -used to find docket information 44316
Date of most recent change to record Dec 18 2002 11:38AM
User who most recently changed record NTSB\GIUV
Basic weather conditions Instrument Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N421H
NTSB Number FTW91FA027
Missing Aircraft Indicator N
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed IFR
Flight plan Was Activated? --
Damage Destroyed
Aircraft Fire Ground
Aircraft Explosion None
Aircraft Manufacturer's Full Name CESSNA
Aircraft Model 421B
Aircraft Series Identifier 421B
Aircraft Serial Number 421B0516
Certified Max Gross Weight 7200
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 7
Number of Engines 2
Fixed gear or retractable gear Retractable
Aircraft, Type of Last Inspection Annual
Date of Last Inspection May 22 1990 12:00AM
Airframe hours since last inspection 117
Airframe Hours 2580
ELT Installed Yes
ELT Activated Yes
ELT Aided Location of Event Site No
ELT Type --
Aircraft Owner Name SHANKS, RONNIE E
Aircraft Owner Street Address P.O. BOX 30
Aircraft Owner City WEBBERS FALLS
Aircraft Owner State OK
Aircraft Owner Country
Aircraft Owner Zipcode 74470
Operator is an individual? --
Operator Name
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address
Operator City
Operator State
Operator Country
Operator Zip code
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 No
Departure Point Same as Event Yes
Departure Airport Code MKO
Departure City
Departure State
Departure Country
Departure Time 2042
Departure Time Zone CST
Destination Same as Local Flt --
Destination Airport Code ABQ
Destination City ALBUQUERQUE
Destination State NM
Destination Country
Specific Phase of Flight Takeoff
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Jan 2 2001 10:35AM
User who most recently changed record dbo
Since inspection or accident --
Event Location Runway Number and Location 13
Runway Length 7200
Runway Width 150
Sight Seeing flight No
Air Medical Flight No
Medical Flight --