NTSB Identification: ATL89FA065.
The docket is stored on NTSB microfiche number 39386.
Accident occurred Monday, January 02, 1989 in MANSFIELD, OH
Probable Cause Approval Date: 12/10/1990
Aircraft: MITSUBISHI MU-2B, registration: N500V
Injuries: 4 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DRG ARRIVAL, THE FLT WAS VCTRD FOR AN ILS RWY 32 APCH. AS THE ARRIVAL CONTD, THE ATC CTLR PROVIDED THE LATEST INFO ON CLOUD TOPS & IN-CLOUD ICING. THE PLT ACKNOWLEDGED, THEN INQUIRED ABOUT THE STATUS OF THE 'LOCATOR.' THE CTLR ADZD THAT ALL COMPONENTS OF THE ILS, INCLUDING THE OUTER MARKER LOCATOR, WERE MONITORING NML. FOUR MI FM THE OUTER MARKER/FAF, THEPLT WAS GIVEN A FINAL VECTOR, WAS CLRD FOR THE APCH & WAS CLRD TO CIRCLE & LND ON RWY 23. HE ACKNOWLEDGED, THEN RADIO & RADAR CTC WITH THE ACFT WERE LOST. THE ACFT CRASHED APRX 2 MI SE OF THE FAF, WHILE IN A STEEP DSCNT ON A HDG OF 140 DEG.NO PREIMPACT PART FAILURE/MALFUNCTION OF THE ACFT WAS FND, THOUGH IT WAS EXTENSIVELY DMGD. ABT 3 WKS AFTER A BOATING ACDNT ON 7/2/88, THE PLT WAS ADMITTED TO A HOSPITAL & TREATED FOR A STROKE, BUT AN AUTOPSY & TOX CHECKS FAILED TO REVEALANY COND WHICH WOULD HAVE PREVENTED THE PLT FM PERFORMING HIS DUTIES. AD 88-13-01, CONCERNING ACFT EQUIPPED WITH M-4C/D AUTOPLTS, WAS NOT COMPLIED WITH.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FAILURE OF THE PILOT TO MAINTAIN CONTROL OF THE AIRCRAFT, DUE TO SPATIAL DISORIENTATION, AT ABOUT THE TIME HE WAS CHANGING RADIO FREQUENCIES DURING AN IFR APPROACH.

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