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.