Narrative:

Aircraft landed fll with hydraulic leak in 'a' system. Maintenance replaced ruptured hydraulic line and static tested system and svced the 'a' system. Crew performed normal preflight checks, prestart, taxi, takeoff checks all normal. Hydraulic system quantity decreased slightly after startup and leveled off at slightly below normal levels, but acceptable. Departing fll overshot assigned altitude of 3000 ft by 700 ft. Immediate correction initiated and deviation lasted less than 30 seconds. Crew was momentarily distracted by indications of possible hydraulic malfunction. Aircraft had been delayed for 'a' system hydraulic leak. After takeoff 'a' system hydraulic decreased significantly and captain and so discussed the possibility of another failure when altitude deviation occurred. As it turned out, the hydraulic problem was simply a slightly undersvced hydraulic system after maintenance had been performed. Hydraulic pressure remained stable and quantity stabilized at minimum acceptable levels. Contributing factor: all 3 crew members focused on a possible serious malfunction during a critical phase of flight.

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Original NASA ASRS Text

Title: FLC DISTR ACFT EQUIP PROB. CLBING OVERSHOT ASSIGNED ALT BY 700 FT. RETURNED TO ASSIGNED ALT.

Narrative: ACFT LANDED FLL WITH HYD LEAK IN 'A' SYS. MAINT REPLACED RUPTURED HYD LINE AND STATIC TESTED SYS AND SVCED THE 'A' SYS. CREW PERFORMED NORMAL PREFLT CHKS, PRESTART, TAXI, TKOF CHKS ALL NORMAL. HYD SYS QUANTITY DECREASED SLIGHTLY AFTER STARTUP AND LEVELED OFF AT SLIGHTLY BELOW NORMAL LEVELS, BUT ACCEPTABLE. DEPARTING FLL OVERSHOT ASSIGNED ALT OF 3000 FT BY 700 FT. IMMEDIATE CORRECTION INITIATED AND DEV LASTED LESS THAN 30 SECONDS. CREW WAS MOMENTARILY DISTRACTED BY INDICATIONS OF POSSIBLE HYD MALFUNCTION. ACFT HAD BEEN DELAYED FOR 'A' SYS HYD LEAK. AFTER TKOF 'A' SYS HYD DECREASED SIGNIFICANTLY AND CAPT AND SO DISCUSSED THE POSSIBILITY OF ANOTHER FAILURE WHEN ALTDEV OCCURRED. AS IT TURNED OUT, THE HYD PROB WAS SIMPLY A SLIGHTLY UNDERSVCED HYD SYS AFTER MAINT HAD BEEN PERFORMED. HYD PRESSURE REMAINED STABLE AND QUANTITY STABILIZED AT MINIMUM ACCEPTABLE LEVELS. CONTRIBUTING FACTOR: ALL 3 CREW MEMBERS FOCUSED ON A POSSIBLE SERIOUS MALFUNCTION DURING A CRITICAL PHASE OF FLT.

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.