FK10 CREW DISCOVERS AIR CONDITIONING PACKS HAD NOT BEEN TURNED ON BEFORE TKOF AT STL.

Narrative

AFTER DEPARTING STL; CABIN PRESSURE CTLR CHANNEL MESSAGE ALERT APPEARED ON THE MFDU. AS I WAS PF; THE CAPT SELECTED MANUAL PRESSURIZATION AND REGAINED CTL. CABIN RATE OF CLB APPEARED NORMAL AFTERWARD. ALSO NORMAL PSID. A MIN OR TWO LATER; THE 10000 FT CABIN ALT ALARM SOUNDED. WE FOUND BOTH PACKS HAD BEEN LEFT OFF SINCE GND DEICING. CAPT RESTORED PACKS AND CABIN PRESSURIZED NORMALLY WITHOUT FURTHER INCIDENT. CHKED AND FOUND NO ILL EFFECTS AMONG PAX OR CREW. WARNING LASTED 20-30 SECONDS; AND CABIN ALT DID NOT CLB VISIBLY PAST 10000 FT. WE BELIEVE SEVERAL EVENTS CONTRIBUTED TO THE SIT. WE HAD DEICED ONCE AND DELAYED PAST HOLDOVER TIME DURING HVY SNOW. WE ENCOUNTERED CONCERTED RESISTANCE TO REDEICING ON THE PART OF STL PERSONNEL; BUT SUCCEEDED IN DEICING A SECOND TIME AFTER REFUSING TO ACCEPT ANYTHING OTHER THAN CLEAN WINGS AND SURFACES. WE THEN ATTEMPTED WITH MORE SUCCESS TO TAXI AND DEPART WITHIN THE PERFORMANCE ENVELOPE OF THE DEICE FLUID. DURING THE SHORT TAXI WE MADE ALL OUR ADJUSTMENTS TO THE TPS AND SPENT A LOT OF TIME WATCHING TFC AND TXWYS IN ADDITION TO (IRONICALLY) DISCUSSING THE TKOF AND THE WX. TIME BECAME A BIT TOO COMPRESSED. IN HINDSIGHT; WE SHOULD HAVE RECOGNIZED THE POTENTIAL FOR TASK SATURATION AND NOTCHED UP THE VIGILANCE OR SLOWED DOWN. MORAL OF THE STORY: PAY MORE ATTN AND SLOW DOWN WHEN EVENTS BEGIN TO PILE UP.