Narrative:

On flight from phx to lax, ZAB assigned 250 KTS on our climb out. The captain was flying and input the airspeed in the FMC. As I was about to confirm the FMC entry, ATC gave a frequency change and the flight attendant entered the cokpit with coffee for the captain. After I checked in with center and took the coffee, I began doing the paperwork and getting the approach charts out for lax meanwhile, we leveled at FL280. I was still doing other duties and did notice the airspeed increase to over 300 KTS. ZAB called and asked if we were doing 250 KTS. I said no -- we are slowing now. ATC then directed an immediate descent to FL260 and report out of FL270. The captain was inputting it in the FMC and I said you need to descend now! She said we are descending. After level off at FL260, I noted traffic at FL280 5 NM at our 12 O'clock on TCASII. Nothing more was mentioned by ATC. I feel that when airspeed clearance is received, it should be input in all phases of flight in the FMC -- not just the present phase, ATC was on top of things. I only wish we had been.

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Original NASA ASRS Text

Title: CAPT OF AN MLG FAILED TO MAINTAIN ATC ASSIGNED SPD RESTR AFTER CRUISE LEVEL OFF.

Narrative: ON FLT FROM PHX TO LAX, ZAB ASSIGNED 250 KTS ON OUR CLBOUT. THE CAPT WAS FLYING AND INPUT THE AIRSPD IN THE FMC. AS I WAS ABOUT TO CONFIRM THE FMC ENTRY, ATC GAVE A FREQ CHANGE AND THE FLT ATTENDANT ENTERED THE COKPIT WITH COFFEE FOR THE CAPT. AFTER I CHKED IN WITH CTR AND TOOK THE COFFEE, I BEGAN DOING THE PAPERWORK AND GETTING THE APCH CHARTS OUT FOR LAX MEANWHILE, WE LEVELED AT FL280. I WAS STILL DOING OTHER DUTIES AND DID NOTICE THE AIRSPD INCREASE TO OVER 300 KTS. ZAB CALLED AND ASKED IF WE WERE DOING 250 KTS. I SAID NO -- WE ARE SLOWING NOW. ATC THEN DIRECTED AN IMMEDIATE DSCNT TO FL260 AND RPT OUT OF FL270. THE CAPT WAS INPUTTING IT IN THE FMC AND I SAID YOU NEED TO DSND NOW! SHE SAID WE ARE DSNDING. AFTER LEVEL OFF AT FL260, I NOTED TFC AT FL280 5 NM AT OUR 12 O'CLOCK ON TCASII. NOTHING MORE WAS MENTIONED BY ATC. I FEEL THAT WHEN AIRSPD CLRNC IS RECEIVED, IT SHOULD BE INPUT IN ALL PHASES OF FLT IN THE FMC -- NOT JUST THE PRESENT PHASE, ATC WAS ON TOP OF THINGS. I ONLY WISH WE HAD BEEN.

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.