Medium large transport aircraft on climb to assigned altitude, went through the altitude by 400 ft. Reporter first officer called captain attention and the aircraft was descended back to assigned. The reporter first officer was off the frequency at the time giving an off report.

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Attributes
ACN	352730
Time
Date	199611
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bxk
State Reference	AZ
Altitude	msl bound lower : 15000 msl bound upper : 15400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : zab
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 1500
ASRS Report	352730
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	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:

Departed phx on the buckeye 2 for a phx-sna turn. Captain hand flew to 12000 ft. He programmed the FMC for direct bxk and engaged LNAV (VNAV was already engaged per company procedure). I was giving the off report to the company on the other radio. The altitude alerter had been set and verified per company procedure. After talking to company and reporting back on frequency, I took a frequency change to ZAB. I had just tuned the frequency when I saw our altitude was 15400 ft with a clearance limit of 15000 ft. I advised the PF and pushed over the aircraft. After leveling at 15000 ft. I contacted ZAB. No mention was made and we offered no explanation. We had verified clrncs, coordinated communications, and generally flew by the book. I have flown with this individual before and know him to be an excellent pilot, leader, and scrupulous observer of company procedure. I have no explanation.

Original NASA ASRS Text

Title: MLG ACFT ON CLB TO ASSIGNED ALT, WENT THROUGH THE ALT BY 400 FT. RPTR FO CALLED CAPT ATTN AND THE ACFT WAS DSNDED BACK TO ASSIGNED. THE RPTR FO WAS OFF THE FREQ AT THE TIME GIVING AN OFF RPT.

Narrative: DEPARTED PHX ON THE BUCKEYE 2 FOR A PHX-SNA TURN. CAPT HAND FLEW TO 12000 FT. HE PROGRAMMED THE FMC FOR DIRECT BXK AND ENGAGED LNAV (VNAV WAS ALREADY ENGAGED PER COMPANY PROC). I WAS GIVING THE OFF RPT TO THE COMPANY ON THE OTHER RADIO. THE ALT ALERTER HAD BEEN SET AND VERIFIED PER COMPANY PROC. AFTER TALKING TO COMPANY AND RPTING BACK ON FREQ, I TOOK A FREQ CHANGE TO ZAB. I HAD JUST TUNED THE FREQ WHEN I SAW OUR ALT WAS 15400 FT WITH A CLRNC LIMIT OF 15000 FT. I ADVISED THE PF AND PUSHED OVER THE ACFT. AFTER LEVELING AT 15000 FT. I CONTACTED ZAB. NO MENTION WAS MADE AND WE OFFERED NO EXPLANATION. WE HAD VERIFIED CLRNCS, COORDINATED COMS, AND GENERALLY FLEW BY THE BOOK. I HAVE FLOWN WITH THIS INDIVIDUAL BEFORE AND KNOW HIM TO BE AN EXCELLENT PLT, LEADER, AND SCRUPULOUS OBSERVER OF COMPANY PROC. I HAVE NO EXPLANATION.

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.