FLC OF A300 MAKING A GAR DUE TO TFC ON THE RWY IS ASSIGNED 2000 FT. BECAUSE OF NOT USING TOGA PWR FLC IS DISTR AND CLBS ABOVE ASSIGNED ALT.

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LOCATION: SJU. THE CAPT WAS FLYING A VISUAL STRAIGHT-IN APCH TO SJU RWY 8. THE WX WAS CAVOK BUT THERE WAS HVY INBOUND TFC DUE TO UNSCHEDULED CLOSURE OF RWY 10. THE APCH WAS HAND FLOWN WITH THE ILS RWY 8 TUNED AND THE FLT DIRECTOR IN LAND. AT ABOUT 1000 FT; THE CAPT DISENGAGED THE AUTOTHROTTLES. WE WERE SPACED VERY TIGHTLY BEHIND LIGHT ACFT TFC ON A R BASE. TWR INSTRUCTED S-TURNS TO INCREASE SPACING AND ASKED THE LIGHT ACFT TO LAND LONG AND TAKE THE HIGH SPD; BUT IT DIDN'T WORK AND AT ABOUT 500 FT; THEY TOLD US TO GAR. THE CAPT MANUALLY PUSHED UP THE PWR; CALLED FOR FLAPS AND THEN GEAR AS WE CLBED OUT TO 2000 FT AS INSTRUCTED BY THE TWR. HOWEVER; HE DID NOT USE THE TOGA LEVERS AND; AS A RESULT; THE FMA REMAINED IN APCH MODE. AT ABOUT 1000 FT IN THE CLB; I TOLD HIM HE HAD TO TOGA TO GET THE FMA TO DO WHAT HE WANTED AND HE INDICATED HE DIDN'T WANT TO HAVE THE PWR GO UP THAT HIGH. DURING ATTEMPTS TO GET THE FMA TO DISENGAGE FROM THE APCH MODE IN A STEADY CLB; WE BOTH NOTICED WE WERE GOING THROUGH 2000 FT. THE CAPT HAD BEGUN A TURN AS INSTRUCTED BY TWR; AND REALIZING THE ALT TREND; HE LOWERED THE NOSE AND DSNDED BACK TO 2000 FT. AT THE TOP OF CLB I THINK WE REACHED 2500 FT. WE BOTH SHUT OUR FLT DIRECTORS OFF AND GOT BACK TO BASIC FLYING. TWR DID NOT COMMENT ON THE DEV AND WE SUBSEQUENTLY COMPLETED A NORMAL APCH AND LNDG. SUPPLEMENTAL INFO FROM ACN 364350: MADE A MISTAKE AND LEARNED FROM THIS EPISODE AND HOPE IT WILL PREVENT OTHER INCIDENTS.