A falcon 10 captain reported an altitude deviation in ZOB's airspace.

Attributes
ACN	587531
Time
Date	200307
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : ekn.vortac
State Reference	WV
Altitude	msl bound lower : 27000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : corporate
Make Model Name	Falcon 10C
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 130 flight time total : 8500 flight time type : 500
ASRS Report	587531
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew faa : investigated
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on an IFR flight plan from cyyz to rdu. Copilot was flying and I, the captain, was involved with calling customs to update our arrival time to rdu and dealing with our passenger. We were at FL290 and were told to descend to FL270. Copilot started descent on the autoplt. The autoplt failed to capture the altitude and copilot failed to see the deviation. Action was taken by me, the captain, to correct the deviation as center asked our altitude. Copilot responded, correcting to FL270. Less than 1000 ft deviation occurred. I observed our TCASII and saw no visual problems. I then asked if we had a problem with center and they advised, 'we are reviewing it now.'

Original NASA ASRS Text

Title: A FALCON 10 CAPT RPTED AN ALT DEV IN ZOB'S AIRSPACE.

Narrative: WE WERE ON AN IFR FLT PLAN FROM CYYZ TO RDU. COPLT WAS FLYING AND I, THE CAPT, WAS INVOLVED WITH CALLING CUSTOMS TO UPDATE OUR ARR TIME TO RDU AND DEALING WITH OUR PAX. WE WERE AT FL290 AND WERE TOLD TO DSND TO FL270. COPLT STARTED DSCNT ON THE AUTOPLT. THE AUTOPLT FAILED TO CAPTURE THE ALT AND COPLT FAILED TO SEE THE DEV. ACTION WAS TAKEN BY ME, THE CAPT, TO CORRECT THE DEV AS CTR ASKED OUR ALT. COPLT RESPONDED, CORRECTING TO FL270. LESS THAN 1000 FT DEV OCCURRED. I OBSERVED OUR TCASII AND SAW NO VISUAL PROBLEMS. I THEN ASKED IF WE HAD A PROB WITH CTR AND THEY ADVISED, 'WE ARE REVIEWING IT NOW.'

Data retrieved from NASA's ASRS site as of July 2007 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.