Narrative:

Very little rest/sleep was gotten during my rest period due to the time of day and my internal clock. My first officer that night had just returned from several weeks vacation and stated he may be a little slow with the follows and list, and I thought not a problem. Well, when the airplane arrived at the gate, the departing captain stated the APU was deferred and that the flap self test had been intermittently malfunctioning but was working. At our company, we start and normally taxi on 1 engine so for continuity, the first officer's start the engines. Well, we normally push off the gate then start off of the APU, however the APU was deferred so we had to start the #1 engine before pushing back and this disrupts the normal flows that the first officer's follow. Well, on taxi out on the before takeoff checks, we were getting a flap malfunction indication and we went to taxi back to the gate for maintenance. On taxi in, the first officer then noticed he had not placed the electronic hydraulic pump in the on position, thus, the inboard flaps had no hydraulic source. The pump was then placed in the on position and the flaps operated normally. We then notified operations that the malfunction had been corrected and we were proceeding with the flight. Factors involved captain's fatigue, first officer's absence from the cockpit for a number of weeks, previous crew's alert to possible flap problems, break from normal flow checks.

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Original NASA ASRS Text

Title: LTT FLC NEGLECTS TO PLACE HYD PUMP IN ON POS. NO FLAPS. TAXI BACK, THEN DISCOVER PROBLEM.

Narrative: VERY LITTLE REST/SLEEP WAS GOTTEN DURING MY REST PERIOD DUE TO THE TIME OF DAY AND MY INTERNAL CLOCK. MY FO THAT NIGHT HAD JUST RETURNED FROM SEVERAL WKS VACATION AND STATED HE MAY BE A LITTLE SLOW WITH THE FOLLOWS AND LIST, AND I THOUGHT NOT A PROBLEM. WELL, WHEN THE AIRPLANE ARRIVED AT THE GATE, THE DEPARTING CAPT STATED THE APU WAS DEFERRED AND THAT THE FLAP SELF TEST HAD BEEN INTERMITTENTLY MALFUNCTIONING BUT WAS WORKING. AT OUR COMPANY, WE START AND NORMALLY TAXI ON 1 ENG SO FOR CONTINUITY, THE FO'S START THE ENGS. WELL, WE NORMALLY PUSH OFF THE GATE THEN START OFF OF THE APU, HOWEVER THE APU WAS DEFERRED SO WE HAD TO START THE #1 ENG BEFORE PUSHING BACK AND THIS DISRUPTS THE NORMAL FLOWS THAT THE FO'S FOLLOW. WELL, ON TAXI OUT ON THE BEFORE TKOF CHKS, WE WERE GETTING A FLAP MALFUNCTION INDICATION AND WE WENT TO TAXI BACK TO THE GATE FOR MAINT. ON TAXI IN, THE FO THEN NOTICED HE HAD NOT PLACED THE ELECTRONIC HYD PUMP IN THE ON POS, THUS, THE INBOARD FLAPS HAD NO HYD SOURCE. THE PUMP WAS THEN PLACED IN THE ON POS AND THE FLAPS OPERATED NORMALLY. WE THEN NOTIFIED OPS THAT THE MALFUNCTION HAD BEEN CORRECTED AND WE WERE PROCEEDING WITH THE FLT. FACTORS INVOLVED CAPT'S FATIGUE, FO'S ABSENCE FROM THE COCKPIT FOR A NUMBER OF WKS, PREVIOUS CREW'S ALERT TO POSSIBLE FLAP PROBLEMS, BREAK FROM NORMAL FLOW CHKS.

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.