Altitude deviation overshoot in climb.

Attributes
ACN	294088
Time
Date	199501
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jpu
State Reference	WV
Altitude	msl bound lower : 21000 msl bound upper : 22000
Environment
Flight Conditions	Mixed
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zid tower : ama
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 220 flight time total : 9000 flight time type : 6000
ASRS Report	294088
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 160 flight time total : 8000 flight time type : 2000
ASRS Report	294921
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On climb out from crw the #1 air data computer failed resulting in failure of altitude alerter, captain's corrected altitude mode, autoplt, etc. The crew was distracted with the malfunction and a light aircraft with a rapid climb rate contributed to us overshooting the assigned altitude of FL210. The problem was recognized immediately and the altitude corrected as quickly as possible without throwing passenger around. ATC did not comment on the overshoot and TCASII did not show any aircraft within 20 mi (no conflict). Crew fatigue (second morning of very early wake-ups) may have contributed to slower than normal response in dealing with an air data computer failure at the time of leveloff.

Original NASA ASRS Text

Title: ALTDEV OVERSHOOT IN CLB.

Narrative: ON CLBOUT FROM CRW THE #1 AIR DATA COMPUTER FAILED RESULTING IN FAILURE OF ALT ALERTER, CAPT'S CORRECTED ALT MODE, AUTOPLT, ETC. THE CREW WAS DISTRACTED WITH THE MALFUNCTION AND A LIGHT ACFT WITH A RAPID CLB RATE CONTRIBUTED TO US OVERSHOOTING THE ASSIGNED ALT OF FL210. THE PROB WAS RECOGNIZED IMMEDIATELY AND THE ALT CORRECTED AS QUICKLY AS POSSIBLE WITHOUT THROWING PAX AROUND. ATC DID NOT COMMENT ON THE OVERSHOOT AND TCASII DID NOT SHOW ANY ACFT WITHIN 20 MI (NO CONFLICT). CREW FATIGUE (SECOND MORNING OF VERY EARLY WAKE-UPS) MAY HAVE CONTRIBUTED TO SLOWER THAN NORMAL RESPONSE IN DEALING WITH AN AIR DATA COMPUTER FAILURE AT THE TIME OF LEVELOFF.

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.