NTSB Identification: FTW89FA023.
The docket is stored on NTSB microfiche number 37970.
Accident occurred Saturday, November 19, 1988 in OKLAHOMA CITY, OK
Probable Cause Approval Date: 08/24/1989
Aircraft: BEECH A36, registration: N6639R
Injuries: 2 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.

THE PLT WAS BRIEFED ON FLT PRCTNS FOR IFR CONDS, TSTMS & OCNL MOD RIME ICING. DRG THE CLIMB, HE TOLD ATC HE WAS HAVING TROUBLE WITH HIS VACUUM & WAS DISORIENTED. ATC CLRD HIM FOR ALTITUDES HE COULD USE & BGN PROVIDING NO-GYRO VECTORS. A WXCHECK REVEALED THERE WERE NO ARPTS WITH VFR CONDS W/I 100 MI. THE PLT ELECTED TO DIVERT FOR AN ILS RWY 17R APCH TO THE WILL ROGERS WORLD ARPT. AS THE FLT CONTD, THE PLT RPRTD HE WAS STARTING TO "PICK UP A LITTLE ICE" & WAS HAVING TROUBLE CLIMBING. WITH ATC ASSIST, HE MADE AN ILS APCH, BUT WAS TOO HI TO MAKE A NORMAL LNDG. HE WAS TOLD TO CLIMB & TURN RGT FOR A MISSED APCH, BUT THE ACFT TURNED LEFT TO AN EASTERLY HDG & CRASH LANDED NEAR THE CENTER OF THE ARPT WITH THE GEAR DWN & FLAPS RETRACTED. THE GEAR COLLAPSED ON IMPACT. THE ACFT SLID 330' & STOPPED ON RWY 17L. IT THEN BURNED, DESTROYINGVACUUM HOSES, REGULATOR & MOST OF THE ATTITUDE INDCR, BUT THE VACUUM PUMP WAS STILL OPERABLE. ALTHOUGH THE ACFT BURNED, PIECES OF THICK ICE WERE FND ON THE LEFT WING. THE ACFT WAS NOT EQUIPPED FOR FLT INTO KNOWN ICING CONDS.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

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

WING..ICE


Contributing Factors

FLIGHT INTO KNOWN ADVERSE WEATHER


Contributing Factors

VACUUM SYSTEM..UNDETERMINED


Contributing Factors

FLIGHT/NAV INSTRUMENTS,ATTITUDE INDICATOR..INOPERATIVE


Contributing Factors

SPATIAL DISORIENTATION..PILOT IN COMMAND



Contributing Factors

WEATHER CONDITION..ICING CONDITIONS


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

WEATHER CONDITION..FOG



Contributing Factors

PROPER GLIDEPATH..NOT MAINTAINED




Contributing Factors

LOWERING OF FLAPS..NOT ATTAINED..PILOT IN COMMAND

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