ACR MLG FLC COMPLETED A FLT WITH AN ACI WITH THE R AUX HYDRAULIC PUMP OFF.

Narrative

ON FLT OUT OF BOSTON I WAS ACTING AS FO ON AN AIRLINES MLG. OUR CHKLIST AND SOPS AFTER ENG START CALL FOR THE R AUX HYDRAULIC PUMP TO BE MOMENTARILY TURNED OFF THEN RETURNED TO THE ON POS TO VERIFY NORMAL OP OF THE R ENG DRIVEN HYDRAULIC PUMP. THIS CHK IS NORMALLY ACCOMPLISHED BY TURNING OFF THE R AUX PUMP THEN TURNING THE CTLS TO MAKE A LOSS OF HYDRAULIC PRESSURE READILY NOTICEABLE. THEN RETURNING THE PUMP TO ON. DUE TO A DISTR OF SOME KIND (ATC OR GND CREW STILL ON INTERPHONE) THE PUMP WAS NOT RETURNED TO THE ON POS. AN FAA INSPECTOR WAS ON THE JUMPSEAT DURING THIS TIME AND THE TAXI; TKOF; AND INITIAL CLB WAS MADE WITH THIS PUMP OFF AND WAS NOTICED DURING THE TKOF ROLL BY THE FAA INSPECTOR BUT NOT MENTIONED UNTIL THE FLT TERMINATED IN MILWAUKEE. I HAVE SINCE ALTERED THE WAY I DO THIS PROC BY BEING SURE TO KEEP MY HAND ON THE PUMP CTL SWITCH AND NOT REMOVE IT UNTIL THE SWITCH HAS BEEN RETURNED TO THE ON POS. THIS SHOULD ELIMINATE THE POSSIBILITY OF THIS HAPPENING IN THE FUTURE. SAFETY OF THIS FLT WAS NEVER IN QUESTION BECAUSE OF TRIPLE REDUNDANCY OF THE R HYDRAULIC SYS.