Narrative:

While we were flying the ILS runway 10 at about 1000 ft to sju, the tower controller cleared a light twin for takeoff on runway 10. I did not see any traffic at first as I scanned the end of the runway. After 5-10 seconds, I observed an aircraft on taxiway H near taxiway B taxiing in our direction, then making the u-turn on taxiway a and taking off on runway 10. I believe were less than 500 ft AGL when this aircraft began its takeoff roll. I immediately went from flaps 30 degrees to flaps 40 degrees for some marginal slowing. I felt trapped. I felt going around was the more hazardous choice of a go around or landing because of the chance for a closer point of approach to the other aircraft (near midair) and the danger of dropping my 'wake' on it. I estimate I was less than 200 ft when the other aircraft became airborne. I voiced my displeasure with the tower supervisor. I told the supervisor that his local controller placed me in a difficult situation. He agreed and said he would take local discipline. I also said I would file this report. I do not know where this plane was when it was cleared for takeoff, but obviously it was not in a position to take off immediately. The tower should have canceled that aircraft's takeoff clearance, or he should have declined it.

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Original NASA ASRS Text

Title: THE FLC OF AN ACR B737 HAD A LIGHT TWIN CLRED FOR TKOF ON THEIR RWY WHEN THEY WERE ABOUT 1000 FT AGL.

Narrative: WHILE WE WERE FLYING THE ILS RWY 10 AT ABOUT 1000 FT TO SJU, THE TWR CTLR CLRED A LIGHT TWIN FOR TKOF ON RWY 10. I DID NOT SEE ANY TFC AT FIRST AS I SCANNED THE END OF THE RWY. AFTER 5-10 SECONDS, I OBSERVED AN ACFT ON TXWY H NEAR TXWY B TAXIING IN OUR DIRECTION, THEN MAKING THE U-TURN ON TXWY A AND TAKING OFF ON RWY 10. I BELIEVE WERE LESS THAN 500 FT AGL WHEN THIS ACFT BEGAN ITS TKOF ROLL. I IMMEDIATELY WENT FROM FLAPS 30 DEGS TO FLAPS 40 DEGS FOR SOME MARGINAL SLOWING. I FELT TRAPPED. I FELT GOING AROUND WAS THE MORE HAZARDOUS CHOICE OF A GAR OR LNDG BECAUSE OF THE CHANCE FOR A CLOSER POINT OF APCH TO THE OTHER ACFT (NEAR MIDAIR) AND THE DANGER OF DROPPING MY 'WAKE' ON IT. I ESTIMATE I WAS LESS THAN 200 FT WHEN THE OTHER ACFT BECAME AIRBORNE. I VOICED MY DISPLEASURE WITH THE TWR SUPVR. I TOLD THE SUPVR THAT HIS LCL CTLR PLACED ME IN A DIFFICULT SIT. HE AGREED AND SAID HE WOULD TAKE LCL DISCIPLINE. I ALSO SAID I WOULD FILE THIS RPT. I DO NOT KNOW WHERE THIS PLANE WAS WHEN IT WAS CLRED FOR TKOF, BUT OBVIOUSLY IT WAS NOT IN A POS TO TAKE OFF IMMEDIATELY. THE TWR SHOULD HAVE CANCELED THAT ACFT'S TKOF CLRNC, OR HE SHOULD HAVE DECLINED IT.

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.