FO OF AN LTT FAILED TO MAKE A XING RESTR ALT DUE TO INSUFFICIENT RATE OF DSCNT.

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EN RTE FROM DFW TO HOU PROCEEDING DIRECT NAVASOTA VOR. CTLR SAID START DSCNT NOW. WE HAD NOT ACKNOWLEDGED RECEIVING INSTRUCTIONS PRIOR TO THAT. QUERIED AS TO WHAT CLRNC WAS. HE SAID CROSS NAVASOTA AT 9000 FT. WE WERE AT 17000 FT. FO FLYING HAS ONLY 74 HRS IN TYPE. SHE STARTS DOWN AT 1000 FPM; VERY STRONG TAILWINDS. WE'RE SHOWING 327 KTS IN DSCNT; NORMALLY MIGHT BE 290 KTS. I MENTION TO INCREASE DSCNT. SHE GOES TO 1500 FPM. AS WE GET CLOSER TO FIX I MENTION AGAIN TO ROLL IN SOME MORE RATE AS IT LOOKED LIKE IT'LL BE CLOSE. SHE GOES TO 1800 FPM. LOOKS REAL CLOSE. GOING THROUGH 10000 FT; I LOOK AT ARR (STRUK 8 TO HOU) TO SEE OUTBOUND RADIAL. THIS IS A DOUBLE CHK AND LOOK UP TO SEE SHE HAS RELAXED DSCNT. WE CROSS NAVASOTA AT 9400 FT OR 9300 FT. GIVEN SWITCH TO APCH CTL WITH NO COMMENT. NO CONFLICT NOTED. SIT CAUSED BY LATE DSCNT TO FIX AND NEW FO NOT REALIZING HOW FAST WE'RE GOING. AS CAPT TRYING TO LET HER LEARN A LITTLE WAS A LITTLE SLOW IN COMMENTING ON RATE OF DSCNT. SHOULD HAVE SUGGESTED 2000 FPM TO START. BETTER TO BE EARLY THAN LATE.