LAX87FA350

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.