PLTDEV -- ALT OVERSHOT ON DSCNT.

Narrative

APCHING DENVER FROM THE NE; WE CROSSED KEANN AT 17000 FT/250 KTS AND WERE CLRED TO 12000 FT. SHORTLY CAME 11000 FT WITH DIRECT ALTUR. MY MIND SLIPPED OUT OF GEAR DSNDING THROUGH 11300 FT. I WAS PNF; WAS TUNING THE RWY 26L ILS FOR GLIDE PATH VERIFICATION; AND PERHAPS WAS PREOCCUPIED WITH SEPARATING MORSE IDENT FROM VERBAL TFC ON THE COM FREQ. WE BOTH WERE STARTLED BY THE ALT ALERT AURAL WARNING DSNDING THROUGH 10700 FT. IT TOOK A MOMENT TO INTERP THIS READOUT (I CAN'T BELIEVE THIS IS HAPPENING -- MAYBE THERE'S SOME GOOD REASON FOR THIS) AND REALIZE WE WERE SUPPOSED TO BE AT 11000 FT. THE COPLT RAISED THE NOSE; ADDED PWR; AND RETURNED PROMPTLY TO 11000 FT...AT WHICH TIME THE CTLR CLRED US TO 9000 FT. THE LOWEST POINT IN THE DSCNT WAS 10600 FT. WE KNEW OF NO TFC AT 10000 FT AND NEVER UNCOVERED ANY BUT AS I AM WRITING THIS I NOW THINK THAT DENVER DOES HAVE A DEP CORRIDOR TAKING TFC E AT 10000 FT UNDERNEATH INBOUNDS FROM THE NE AT 11000 FT. ASIDE FROM MORE STEADFAST VIGILANCE ON THE PART OF THE CREW; THE 1 IMPROVEMENT I WOULD SUGGEST IS MORE RAPID AND CONTINUOUS MORSE IDENT ON TERMINAL AREA NAVAIDS. IF THESE NAVAIDS ARE TO BE IDENTED; THE PLT MUST DIVIDE ATTN BTWN THIS TASK AND MONITORING AN OFTEN SATURATED COM FREQ FOR CALLS REQUIRING A RESPONSE AS WELL AS FOR PERIPHERAL INFO. I DON'T GET INTO ORD MUCH ANY MORE AND DO NOT KNOW IF CHANGES HAVE BEEN MADE IN RECENT YRS BUT TO ME THE PARAGON WAS THE MORSE IDENT ON THE RWY 14L ILS. FAST AND FREQUENT; IT MADE IDENT EASY THROUGH A FEW SMALL AND IRREGULAR BREAKS IN COM. ATIS COULD ALSO BENEFIT FROM SIMILAR MODIFICATION SINCE EVEN CTR FREQS ARE CONGESTED IN THIS MODERN DAY.