Narrative:

Approximately 25 mi southeast of phl, phl departure issued a clearance for us to climb to 10000'. First officer was flying and I (captain) monitored his level off at 10000'. He was hand-flying at this time. I then went to the P/a to address the passenger with destination WX, time en route, etc. As I leaned over to pick up the WX sheet, I heard the altitude alerter go off and called immediate attention to it. The first officer had inadvertently climbed to 10400'. He began an immediate recovery to 10000'. ZNY (whom we had been previously turned over to) on 132.95 called the altitude incursion. No further incident. First officer stated to me that he had worked with our FMC for a moment, which had diverted his attention. Solution: to make computer entries we should always select autoplt on first, or wait for the other crew member to return from his duties to coordinate selections if you choose to hand-fly. Occurred on a 10-hour duty day--fatigue could have been a contributing factor.

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Original NASA ASRS Text

Title: FO, PF, OVERSHOOTS ASSIGNED ALT.

Narrative: APPROX 25 MI SE OF PHL, PHL DEP ISSUED A CLRNC FOR US TO CLB TO 10000'. F/O WAS FLYING AND I (CAPT) MONITORED HIS LEVEL OFF AT 10000'. HE WAS HAND-FLYING AT THIS TIME. I THEN WENT TO THE P/A TO ADDRESS THE PAX WITH DEST WX, TIME ENRTE, ETC. AS I LEANED OVER TO PICK UP THE WX SHEET, I HEARD THE ALT ALERTER GO OFF AND CALLED IMMEDIATE ATTN TO IT. THE F/O HAD INADVERTENTLY CLBED TO 10400'. HE BEGAN AN IMMEDIATE RECOVERY TO 10000'. ZNY (WHOM WE HAD BEEN PREVIOUSLY TURNED OVER TO) ON 132.95 CALLED THE ALT INCURSION. NO FURTHER INCIDENT. F/O STATED TO ME THAT HE HAD WORKED WITH OUR FMC FOR A MOMENT, WHICH HAD DIVERTED HIS ATTN. SOLUTION: TO MAKE COMPUTER ENTRIES WE SHOULD ALWAYS SELECT AUTOPLT ON FIRST, OR WAIT FOR THE OTHER CREW MEMBER TO RETURN FROM HIS DUTIES TO COORDINATE SELECTIONS IF YOU CHOOSE TO HAND-FLY. OCCURRED ON A 10-HR DUTY DAY--FATIGUE COULD HAVE BEEN A CONTRIBUTING FACTOR.

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.