Narrative:

Enroute from ZZZ to las; I was on communication one obtaining the las ATIS when center called the captain on communication two and changed our arrival from the kaddy 1 to descend via the tyssn 2 arrival. We were only 10 miles from the initial arrival fix when receiving the change. I reprogrammed the FMS to the new arrival; we then realized that we could not make the crossing restr for the first fix. Las ATC asked me why; and I informed her that ATC had switched arrival on us and I did not have time to get all the crossing restrs in the FMS fast enough to make the descent. After the missing the first crossing fix; we were then trying to catch up with the checklists and reprogramming the both FMS. I finally found the new arrival on my efb; and was studying it when the captain said primo at 8000 ft; to I agreed and set it in the altitude alerter and the airplane started down prematurely. ATC needs to give the crew more lead time when changing arrs; as it takes time for the crew to reprogram the FMS computers; and efb's. The crew allowed ATC to rush us thru a procedure that we were not ready for.

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Original NASA ASRS Text

Title: A FA50 CREW WAS GIVEN A LATE LAS ARR CHANGE TO THE TYSSN 2 10 MILES FORM THE FIRST FIX. THE CREW WAS BEHIND PROGRAMMING EFB'S AND THE FMC'S.

Narrative: ENROUTE FROM ZZZ TO LAS; I WAS ON COM ONE OBTAINING THE LAS ATIS WHEN CENTER CALLED THE CAPT ON COM TWO AND CHANGED OUR ARR FROM THE KADDY 1 TO DSND VIA THE TYSSN 2 ARR. WE WERE ONLY 10 MILES FROM THE INITIAL ARR FIX WHEN RECEIVING THE CHANGE. I REPROGRAMMED THE FMS TO THE NEW ARR; WE THEN REALIZED THAT WE COULD NOT MAKE THE CROSSING RESTR FOR THE FIRST FIX. LAS ATC ASKED ME WHY; AND I INFORMED HER THAT ATC HAD SWITCHED ARR ON US AND I DID NOT HAVE TIME TO GET ALL THE CROSSING RESTRS IN THE FMS FAST ENOUGH TO MAKE THE DSCNT. AFTER THE MISSING THE FIRST CROSSING FIX; WE WERE THEN TRYING TO CATCH UP WITH THE CHKLISTS AND REPROGRAMMING THE BOTH FMS. I FINALLY FOUND THE NEW ARR ON MY EFB; AND WAS STUDYING IT WHEN THE CAPT SAID PRIMO AT 8000 FT; TO I AGREED AND SET IT IN THE ALTITUDE ALERTER AND THE AIRPLANE STARTED DOWN PREMATURELY. ATC NEEDS TO GIVE THE CREW MORE LEAD TIME WHEN CHANGING ARRS; AS IT TAKES TIME FOR THE CREW TO REPROGRAM THE FMS COMPUTERS; AND EFB'S. THE CREW ALLOWED ATC TO RUSH US THRU A PROC THAT WE WERE NOT READY FOR.

Data retrieved from NASA's ASRS site as of May 2009 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.