Narrative:

Air carrier X was cleared for ILS 28R, sfo. Military Y was a nuq departure, flying OSI9 SID. Nuq lies south of sfo 28R final, 20 NM east of sfo. Normal OSI9 departure turn prior to and below sfo final. Due to speed and slower than normal turn on course to osi, military Y went beyond anticipated flight path of normal OSI9 departure. When I realized military Y position relative to sfo final, I issued traffic to air carrier X. They were diverging at that time. Air carrier X also received a TCASII alert. The call sign of military Y being a routine sounding military call sign, I did not notice aircraft was a medium large transport until after the fact of the incident. (90 plus percent of OSI9 departures are light transport turbo propellers). I had been on position 3 mins when the incident occurred. Supplemental information from acn 187843. Air carrier X 14 to 14.5 NM on the sfo 28R localizer. The TCASII went off and I followed the pull up indication. Also I looked on the radar scope and the traffic was behind and below and slightly left but climbing. He was at 3400 ft and we were descending through 4200 ft. As my pull up maneuver progressed, I saw the traffic out my window approximately 300 ft away. He was turning away at the time. Approach said he was limited to 4000 ft. However with our speed of 200 KTS and his probable 250 KTS, it was a very near miss.

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Original NASA ASRS Text

Title: ACR X HAD LTSS FROM MIL Y. SYS ERROR. TCASII RA EVASIVE ACTION TAKEN.

Narrative: ACR X WAS CLRED FOR ILS 28R, SFO. MIL Y WAS A NUQ DEP, FLYING OSI9 SID. NUQ LIES S OF SFO 28R FINAL, 20 NM E OF SFO. NORMAL OSI9 DEP TURN PRIOR TO AND BELOW SFO FINAL. DUE TO SPD AND SLOWER THAN NORMAL TURN ON COURSE TO OSI, MIL Y WENT BEYOND ANTICIPATED FLT PATH OF NORMAL OSI9 DEP. WHEN I REALIZED MIL Y POS RELATIVE TO SFO FINAL, I ISSUED TFC TO ACR X. THEY WERE DIVERGING AT THAT TIME. ACR X ALSO RECEIVED A TCASII ALERT. THE CALL SIGN OF MIL Y BEING A ROUTINE SOUNDING MIL CALL SIGN, I DID NOT NOTICE ACFT WAS A MLG UNTIL AFTER THE FACT OF THE INCIDENT. (90 PLUS PERCENT OF OSI9 DEPS ARE LTT TURBO PROPS). I HAD BEEN ON POS 3 MINS WHEN THE INCIDENT OCCURRED. SUPPLEMENTAL INFO FROM ACN 187843. ACR X 14 TO 14.5 NM ON THE SFO 28R LOC. THE TCASII WENT OFF AND I FOLLOWED THE PULL UP INDICATION. ALSO I LOOKED ON THE RADAR SCOPE AND THE TFC WAS BEHIND AND BELOW AND SLIGHTLY L BUT CLBING. HE WAS AT 3400 FT AND WE WERE DSNDING THROUGH 4200 FT. AS MY PULL UP MANEUVER PROGRESSED, I SAW THE TFC OUT MY WINDOW APPROX 300 FT AWAY. HE WAS TURNING AWAY AT THE TIME. APCH SAID HE WAS LIMITED TO 4000 FT. HOWEVER WITH OUR SPD OF 200 KTS AND HIS PROBABLE 250 KTS, IT WAS A VERY NEAR MISS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.