Narrative:

We departed lga, leveled at 12000 ft. We were filed for 16000 ft. We were picking up light to moderate ice. We requested higher to get out of the ice. About 5 mins later, both captain and first officer heard the controller clear us up to 16000 ft. We answered the call, set the altitude, verified it and started to climb. As we neared 13000 ft, ZNY asked us our altitude. We said out of 13000 ft for 16000 ft. ZNY said 'you took another aircraft's climb,' and to level at 14000 ft. We acknowledged and leveled off at 14000 ft. As far as I know, no conflict ever occurred. I see no way to avoid this kind of altitude deviation. Both crew members were tired. We had flown nights all month. We were scheduled for 9 hours off. However, the hotel van was late and by the time we got to the hotel, we only had 8 1/2 hours. The hotel van ran every 1/2 hour, so we were only 8 hours in the hotel. Since we both were used to nights, we only got 4-5 hours sleep. Since our company says the FAA says this is proper rest and if you call off due to not being properly rested, they will give you days off and possibly terminate you. Pilots will fly tired! If we were rested, the error still may have happened. We have flown the route many times and the climb was given earlier than usual. However, we had asked for higher due to the icing conditions, so getting the early climb was expected. We called back the climb and ZNY did not say our call was blocked or that it was for another aircraft.

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Original NASA ASRS Text

Title: WHILE ENCOUNTERING INFLT ICING, AN SF340 FLT CREW EXPERIENCES AN ALT EXCURSION AFTER TAKING A CLRNC FOR CLB MEANT FOR ANOTHER FLT WHILE 13 MI E OF HUO, NY.

Narrative: WE DEPARTED LGA, LEVELED AT 12000 FT. WE WERE FILED FOR 16000 FT. WE WERE PICKING UP LIGHT TO MODERATE ICE. WE REQUESTED HIGHER TO GET OUT OF THE ICE. ABOUT 5 MINS LATER, BOTH CAPT AND FO HEARD THE CTLR CLR US UP TO 16000 FT. WE ANSWERED THE CALL, SET THE ALT, VERIFIED IT AND STARTED TO CLB. AS WE NEARED 13000 FT, ZNY ASKED US OUR ALT. WE SAID OUT OF 13000 FT FOR 16000 FT. ZNY SAID 'YOU TOOK ANOTHER ACFT'S CLB,' AND TO LEVEL AT 14000 FT. WE ACKNOWLEDGED AND LEVELED OFF AT 14000 FT. AS FAR AS I KNOW, NO CONFLICT EVER OCCURRED. I SEE NO WAY TO AVOID THIS KIND OF ALTDEV. BOTH CREW MEMBERS WERE TIRED. WE HAD FLOWN NIGHTS ALL MONTH. WE WERE SCHEDULED FOR 9 HRS OFF. HOWEVER, THE HOTEL VAN WAS LATE AND BY THE TIME WE GOT TO THE HOTEL, WE ONLY HAD 8 1/2 HRS. THE HOTEL VAN RAN EVERY 1/2 HR, SO WE WERE ONLY 8 HRS IN THE HOTEL. SINCE WE BOTH WERE USED TO NIGHTS, WE ONLY GOT 4-5 HRS SLEEP. SINCE OUR COMPANY SAYS THE FAA SAYS THIS IS PROPER REST AND IF YOU CALL OFF DUE TO NOT BEING PROPERLY RESTED, THEY WILL GIVE YOU DAYS OFF AND POSSIBLY TERMINATE YOU. PLTS WILL FLY TIRED! IF WE WERE RESTED, THE ERROR STILL MAY HAVE HAPPENED. WE HAVE FLOWN THE RTE MANY TIMES AND THE CLB WAS GIVEN EARLIER THAN USUAL. HOWEVER, WE HAD ASKED FOR HIGHER DUE TO THE ICING CONDITIONS, SO GETTING THE EARLY CLB WAS EXPECTED. WE CALLED BACK THE CLB AND ZNY DID NOT SAY OUR CALL WAS BLOCKED OR THAT IT WAS FOR ANOTHER ACFT.

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.