FLC FAILED TO ACTIVATE THE ENG BLEED AIR FOR PRESSURIZATION AFTER TKOF RESULTING IN THE PAX MASKS 'DROPPING DOWN' AT HIGH ALT.

Narrative

A BLEEDS-OFF TKOF (COPLT FLYING) WAS PERFORMED AT JAC. DURING INITIAL CLB WE WERE DISTRACTED BY OTHER OPERATIONAL CONSIDERATIONS; INITIALLY BY ANOTHER ACFT IN THE PATTERN; AND THEN A RTE CHANGE WHICH REQUIRED REPROGRAMMING THE FMS. CONSEQUENTLY; WE FAILED TO COMPLETE THE AFTER TKOF CHKLIST; RESULTING IN THE ENG BLEED NOT BEING TURNED ON. JAC IS AN UNCTLED ARPT AND FROM OUR TCASII IT APPEARED THAT DURING OUR CIRCLING CLB THE OTHER ACFT COULD BE A FACTOR. SOMETIME AROUND TOP OF CLB AT 29000 FT; THE CAPT TURNED OFF THE APU; CAUSING A COMPLETE LOSS OF BLEED AIR. WHEN THE CABIN ALT WARNING HORN CAME ON; WE INITIALLY TOOK IT TO BE AN ANOMALOUS TKOF WARNING HORN AND BEFORE WE RECOGNIZED THE PROB THE CABIN ALT REACHED 14000 FT; CAUSING THE MASTER CAUTION LIGHT TO COME ON AND THE CABIN PRESSURE CTLR TO SWITCH TO STANDBY. WE IMMEDIATELY TURNED ON THE ENG BLEEDS AND WE DONNED OUR OXYGEN MASKS AND STARTED THE CABIN DOWN. WE ALSO ASKED FOR A LOWER ALT AND STARTED A NORMAL DSCNT. UPON COMMUNICATING WITH THE 'A' FLT ATTENDANT; WE FOUND THAT THE PAX MASKS HAD DROPPED AND THAT THE FLT ATTENDANTS WERE PERFORMING THEIR DUTIES IN ASSISTING THE PAX. AT THIS POINT; THE CAPT MADE A PA THAT EVERYTHING WAS UNDER CTL. AFTER THIS; WE DSNDED AND LANDED NORMALLY. DURING DSCNT; MAX CABIN RATE-OF-CHANGE WAS 1000-1500 FPM. DURING DEPLANING THERE WERE NO PAX COMPLAINTS OF EAR PROBS AND NO ONE SEEMED DISTRESSED.