SAN JOSE, CA, USA
N2138G
PIPER PA-44-180
N476AC
MCDONNELL DOUGLAS DC-9
A PIPER SEMINULE WAS VECTORED TO THE FINAL APCH COURSE & CLEARED FOR AN ILS APCH AT 3000FT MSL. A DC-9, IN TRAIL AT 5000 FT MSL, WAS OVERTAKING THE SEMINULE. THE CONTROLLER ELECTED TO CHANGE THEIR SEQUENCE & CLEARED THE SEMINULE TO CLIMB TO 4000FT MSL DUE TO RISING TERRAIN & MAKE A RIGHT 360. THE DC-9 WAS SUBSEQUENTLY ISSUED AN APPROACH CLEARANCE & DESCENT FROM 5000FT, WHICH COMPROMISED SEPA4RATION REQUIREMENTS. THE CONFLICT ALERT WAS MISSED, IN PART BECAUSE IT WAS IDENTICAL WITH THE TERRAIN PROXIMITY ALERT, WHICH SOUNDED FREQUENTLY.
Source: NTSB Aviation Accident Database
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