A BE400 pilot reports descending below the cleared altitude while descending on autopilot and conversing extensively with ATC.

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Attributes
ACN	745156
Time
Date	200707
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 5500 flight time type : 2000
ASRS Report	745156
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While descending with autopilot engaged for landing we deviated below our assigned altitude of FL240. This deviation occurred during extensive communication with center regarding runway assignment/closure and approach type. Both PF and PNF became involved with this communication and programming the FMS. When this deviation was detected; we immediately returned to our assigned FL240.

Original NASA ASRS Text

Title: A BE400 PILOT REPORTS DESCENDING BELOW THE CLEARED ALT WHILE DESCENDING ON AUTOPILOT AND CONVERSING EXTENSIVELY WITH ATC.

Narrative: WHILE DESCENDING WITH AUTOPILOT ENGAGED FOR LANDING WE DEVIATED BELOW OUR ASSIGNED ALTITUDE OF FL240. THIS DEVIATION OCCURRED DURING EXTENSIVE COMMUNICATION WITH CENTER REGARDING RUNWAY ASSIGNMENT/CLOSURE AND APPROACH TYPE. BOTH PF AND PNF BECAME INVOLVED WITH THIS COMMUNICATION AND PROGRAMMING THE FMS. WHEN THIS DEVIATION WAS DETECTED; WE IMMEDIATELY RETURNED TO OUR ASSIGNED FL240.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.