CL65 flight crew climbs to FL230 when the clearance was for FL220.

Attributes
ACN	381490
Time
Date	199709
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mht
State Reference	NH
Altitude	msl bound lower : 22000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 320 flight time total : 3600 flight time type : 980
ASRS Report	381490
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing through FL228 for FL230, ZBW queried us, asked us to verify that we were going to FL220. We responded that we were given FL230 as an assigned altitude. Center then instructed us to descend to FL220, which we did. There were no traffic conflicts that we were aware of (TCASII for 40 NM was clear and showing no aircraft at FL230 and after we descended back to FL220). The climb assignment was given to us while we were at an intermediate altitude of 14000 ft and I was off the radios and making an announcement to the passenger. When I was done and returned to the radios (ie, ATC frequency), the captain informed me that the only change that occurred while I was making the announcement was the climb assignment to the new altitude of FL230.

Original NASA ASRS Text

Title: CL65 FLC CLBS TO FL230 WHEN THE CLRNC WAS FOR FL220.

Narrative: CLBING THROUGH FL228 FOR FL230, ZBW QUERIED US, ASKED US TO VERIFY THAT WE WERE GOING TO FL220. WE RESPONDED THAT WE WERE GIVEN FL230 AS AN ASSIGNED ALT. CTR THEN INSTRUCTED US TO DSND TO FL220, WHICH WE DID. THERE WERE NO TFC CONFLICTS THAT WE WERE AWARE OF (TCASII FOR 40 NM WAS CLR AND SHOWING NO ACFT AT FL230 AND AFTER WE DSNDED BACK TO FL220). THE CLB ASSIGNMENT WAS GIVEN TO US WHILE WE WERE AT AN INTERMEDIATE ALT OF 14000 FT AND I WAS OFF THE RADIOS AND MAKING AN ANNOUNCEMENT TO THE PAX. WHEN I WAS DONE AND RETURNED TO THE RADIOS (IE, ATC FREQ), THE CAPT INFORMED ME THAT THE ONLY CHANGE THAT OCCURRED WHILE I WAS MAKING THE ANNOUNCEMENT WAS THE CLB ASSIGNMENT TO THE NEW ALT OF FL230.

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.