NTSB Identification: LAX87FA350.
The docket is stored on NTSB microfiche number 37877.
14 CFR (D.B.A. AERO SERVICIO DE SONORA )
Accident occurred Wednesday, September 30, 1987 in SAN DIEGO, CA
Probable Cause Approval Date: 08/08/1989
Aircraft: CESSNA 340A, registration: XAKOA
Injuries: 6 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.

AT APRX 0600, THE ACFT DEPD GUERRERO NEGRO, MEXICO ON AN AIR TAXI FLT TO TIJUANA, MEXICO. AT 0715, THE TIJUANA WX WAS RPRTD AS PARTIALLY OBSCURED, VIS 1 MI WITH FOG, HAZE & SMOKE, WIND CALM. DRG ARRIVAL, THE PLT WAS CLRD FOR AN ILS RWY 9 APCH & RPRTD OVER THE FINAL APCH FIX. HOWEVER, THE ACFT CRASHED AT ABOUT 0759, BFR REACHING THE MIDDLE MARKER,WHICH WAS 1/2 MI FROM THE APCH END OF RWY 9. IMPACT WAS ON A RIDGE ABOUT 110 FT BELOW THE ARPT ELEVATION & APRX 100 YDS NORTH OF THE INTERNATIONAL BORDER. THE ACFT WAS FND A SHORT TIME LATER BY U.S. BORDER PATROL PSNL. NO PREIMPACT PART FAILURE OR MALFUNCTION WAS FND. THE 0800 WX AT TIJUANA WAS IN PART: SKY PARTIALLY OBSCURED, VIS 1/10 MI WITH FOG & HAZE,WIND 210 DEG AT 4 KTS. ABT 1 MI NORTH AT BROWN FIELD, THE WX WAS IN PART: SKY PARTIALLY OBSCURED, VIS 3/4 MI WITH FOG & HAZE, WIND 280 DEG AT 4 KTS. A TOXICOLOGY CHECK OF THE PLT'S BLOOD SHOWED AN ALCOHOL LVL OF 0.07%. CALCULATIONS SHOWED THE SUN WOULD HAVE BEEN 16 DEG ABV THE HORIZON ON A MAGNETIC AZIMUTH OF 89.8 DEG.

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

IFR PROCEDURE..IMPROPER..PILOT IN COMMAND

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

PROPER ALTITUDE..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

LIGHT CONDITION..SUNGLARE


Contributing Factors

VISUAL/AURAL PERCEPTION..PILOT IN COMMAND


Contributing Factors

IMPAIRMENT(ALCOHOL)..PILOT IN COMMAND

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