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| Date: | Saturday 5 January 1991 |
| Time: | 21:43 LT |
| Type: |  Cessna 421B |
| Owner/operator: | Shanks, Ronnie E |
| Registration: | N421H |
| MSN: | 421B0516 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 2580 hours |
| Engine model: | CONTINENTAL GTSIO-520-H2 |
| Fatalities: | Fatalities: 6 / Occupants: 6 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | 1.5 nm from Muskagee Airport, Muskogee, Oklahoma -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | (KMKO) |
| Albuquerque, NM | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: 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.
Accident investigation:
 |
|
Sources:
NTSB FTW91FA027
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=421H
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 18-Aug-2016 02:14 | Dr.John Smith | Updated [Time, Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Apr-2024 08:52 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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