Commuter light transport overshoots assigned altitude in climb.

Attributes
ACN	137433
Time
Date	199002
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mfd airport : cle
State Reference	OH
Altitude	msl bound lower : 6000 msl bound upper : 6400
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : cle
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3300 flight time type : 300
ASRS Report	137433
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 240 flight time total : 4350 flight time type : 2000
ASRS Report	137489
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

On climb out from cleveland hopkins we were on radar vectors of 210 and cleared to 6000' MSL. We have no altitude alerting device so our operations specifications calls for a call between both pilots 1000' prior to a level off. We both acknowledged to each other at 5000' MSL, '1 to go'. At this point the first officer (myself) finished the climb checklist. Just as I was completing it, we both noticed almost at the same time, that we had exceeded 6000'. The captain had noticed his altimeter was sticking and was periodically checking mine. He later confirmed that it took a jump of several hundred feet as he was beginning his 6000' level off. This must have caused the deviation. We made a rapid correction and wrote up the altimeter upon return to dayton. Exactly how much the deviation was could not be determined but estimated to be 400'. ATC also noticed the deviation and their call to us came after we had already made the corrective action. Supplemental information from acn 137489. At 6000' I started to level off and the updraft took me to about 6100', then the altimeter jumped to 6400'. ATC instructed as to turn to 180 degree and descend to 6000'. We complied. The altimeter was checked and replaced in dayton. An instrument comparator or altitude alert which would work off of either altimeter would have helped.

Original NASA ASRS Text

Title: COMMUTER LTT OVERSHOOTS ASSIGNED ALT IN CLB.

Narrative: ON CLBOUT FROM CLEVELAND HOPKINS WE WERE ON RADAR VECTORS OF 210 AND CLRED TO 6000' MSL. WE HAVE NO ALT ALERTING DEVICE SO OUR OPS SPECS CALLS FOR A CALL BTWN BOTH PLTS 1000' PRIOR TO A LEVEL OFF. WE BOTH ACKNOWLEDGED TO EACH OTHER AT 5000' MSL, '1 TO GO'. AT THIS POINT THE F/O (MYSELF) FINISHED THE CLB CHKLIST. JUST AS I WAS COMPLETING IT, WE BOTH NOTICED ALMOST AT THE SAME TIME, THAT WE HAD EXCEEDED 6000'. THE CAPT HAD NOTICED HIS ALTIMETER WAS STICKING AND WAS PERIODICALLY CHKING MINE. HE LATER CONFIRMED THAT IT TOOK A JUMP OF SEVERAL HUNDRED FEET AS HE WAS BEGINNING HIS 6000' LEVEL OFF. THIS MUST HAVE CAUSED THE DEVIATION. WE MADE A RAPID CORRECTION AND WROTE UP THE ALTIMETER UPON RETURN TO DAYTON. EXACTLY HOW MUCH THE DEVIATION WAS COULD NOT BE DETERMINED BUT ESTIMATED TO BE 400'. ATC ALSO NOTICED THE DEVIATION AND THEIR CALL TO US CAME AFTER WE HAD ALREADY MADE THE CORRECTIVE ACTION. SUPPLEMENTAL INFO FROM ACN 137489. AT 6000' I STARTED TO LEVEL OFF AND THE UPDRAFT TOOK ME TO ABOUT 6100', THEN THE ALTIMETER JUMPED TO 6400'. ATC INSTRUCTED AS TO TURN TO 180 DEG AND DSND TO 6000'. WE COMPLIED. THE ALTIMETER WAS CHKED AND REPLACED IN DAYTON. AN INSTRUMENT COMPARATOR OR ALT ALERT WHICH WOULD WORK OFF OF EITHER ALTIMETER WOULD HAVE HELPED.

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.