Large transport aircraft climbing to leveloff, climbed through assigned altitude by 300 ft. Cockpit altitude alert brought it to the flight crew attention and aircraft returned to assigned. Reporter captain says he will make his personal SOP to maintain sterile cockpit within 1000 ft of leveloff altitude and not allow distrs.

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Attributes
ACN	365960
Time
Date	199704
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mck
State Reference	NE
Altitude	msl bound lower : 29000 msl bound upper : 29300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 2000
ASRS Report	365960
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified 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:

First officer failed to level off at FL290 and went to FL293 when we received the altitude deviation warning in cockpit. I was busy changing frequencys and looking up jet route course for her. She promptly leveled back at FL290. In the future I plan to treat the time during all leveloffs from 1000 ft above or below the altitude to the planned altitude as a cockpit sterile period and not allow extraneous activities to occur.

Original NASA ASRS Text

Title: LGT ACFT CLBING TO LEVELOFF, CLBED THROUGH ASSIGNED ALT BY 300 FT. COCKPIT ALT ALERT BROUGHT IT TO THE FLC ATTN AND ACFT RETURNED TO ASSIGNED. RPTR CAPT SAYS HE WILL MAKE HIS PERSONAL SOP TO MAINTAIN STERILE COCKPIT WITHIN 1000 FT OF LEVELOFF ALT AND NOT ALLOW DISTRS.

Narrative: FO FAILED TO LEVEL OFF AT FL290 AND WENT TO FL293 WHEN WE RECEIVED THE ALTDEV WARNING IN COCKPIT. I WAS BUSY CHANGING FREQS AND LOOKING UP JET RTE COURSE FOR HER. SHE PROMPTLY LEVELED BACK AT FL290. IN THE FUTURE I PLAN TO TREAT THE TIME DURING ALL LEVELOFFS FROM 1000 FT ABOVE OR BELOW THE ALT TO THE PLANNED ALT AS A COCKPIT STERILE PERIOD AND NOT ALLOW EXTRANEOUS ACTIVITIES TO OCCUR.

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.