Narrative:

At 44n150w sfo radio called us and asked when we could accept FL370. We told them about 1 hour. They cleared us to be at FL370 by 142W or if unable to cross at FL330. 142W has approximately 45 mins flying time from our position. We failed to make the required crossing restr. We were level at FL370 at 140W. Supplemental information from acn 438055: I feel the crew was fatigued from lack of ability to rest adequately in nrt due to the previous day's crossing from anc. I also feel a procedural change might help avoid the situation. It would help if in poor radio conditions, as were present today, a time to climb or descend clearance would be issued rather than distance. And then, ATC call back if no call received from the aircraft at the appointed time. I feel the front end crew misfigured the distance to go before climb, but a time to climb or descend would not have been misinterpreted. Supplemental information from acn 438287: we were at FL350 and due to fuel considerations told them it would be about 1 hour. Supplemental information from acn 437888: when we received the clearance the other so was just going on break and I was coming up to relieve him. I never heard the clearance and the pilots flying never briefed me on a crossing restr. I was out of the loop, so to speak. The HF was also almost impossible to understand. Sfo radio had been trying to SELCAL us but due to sun spots or some other atmospheric condition, it was not possible.

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Original NASA ASRS Text

Title: A B747-200 FREIGHTER AT FL350 DOES NOT MAKE THEIR ASSIGNED ALT AT 142W LONGITUDE, MAKING FL370 ABOUT 8 MINS LATER.

Narrative: AT 44N150W SFO RADIO CALLED US AND ASKED WHEN WE COULD ACCEPT FL370. WE TOLD THEM ABOUT 1 HR. THEY CLRED US TO BE AT FL370 BY 142W OR IF UNABLE TO CROSS AT FL330. 142W HAS APPROX 45 MINS FLYING TIME FROM OUR POS. WE FAILED TO MAKE THE REQUIRED XING RESTR. WE WERE LEVEL AT FL370 AT 140W. SUPPLEMENTAL INFO FROM ACN 438055: I FEEL THE CREW WAS FATIGUED FROM LACK OF ABILITY TO REST ADEQUATELY IN NRT DUE TO THE PREVIOUS DAY'S XING FROM ANC. I ALSO FEEL A PROCEDURAL CHANGE MIGHT HELP AVOID THE SIT. IT WOULD HELP IF IN POOR RADIO CONDITIONS, AS WERE PRESENT TODAY, A TIME TO CLB OR DSND CLRNC WOULD BE ISSUED RATHER THAN DISTANCE. AND THEN, ATC CALL BACK IF NO CALL RECEIVED FROM THE ACFT AT THE APPOINTED TIME. I FEEL THE FRONT END CREW MISFIGURED THE DISTANCE TO GO BEFORE CLB, BUT A TIME TO CLB OR DSND WOULD NOT HAVE BEEN MISINTERPRETED. SUPPLEMENTAL INFO FROM ACN 438287: WE WERE AT FL350 AND DUE TO FUEL CONSIDERATIONS TOLD THEM IT WOULD BE ABOUT 1 HR. SUPPLEMENTAL INFO FROM ACN 437888: WHEN WE RECEIVED THE CLRNC THE OTHER SO WAS JUST GOING ON BREAK AND I WAS COMING UP TO RELIEVE HIM. I NEVER HEARD THE CLRNC AND THE PLTS FLYING NEVER BRIEFED ME ON A XING RESTR. I WAS OUT OF THE LOOP, SO TO SPEAK. THE HF WAS ALSO ALMOST IMPOSSIBLE TO UNDERSTAND. SFO RADIO HAD BEEN TRYING TO SELCAL US BUT DUE TO SUN SPOTS OR SOME OTHER ATMOSPHERIC CONDITION, IT WAS NOT POSSIBLE.

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.