Air carrier widebody transport overshot altitude on climb.

Attributes
ACN	91522
Time
Date	198807
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sac
State Reference	CA
Altitude	msl bound lower : 28000 msl bound upper : 28400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
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 : 180 flight time total : 10000 flight time type : 500
ASRS Report	91522
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6500 flight time type : 1000
ASRS Report	91493
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 other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

During climb, using right autoplt commanded by first officer FMC, in flight level change mode, flight went through the preset 28000' level off altitude by 400+'. Returned to 28000'. Left FMC showed the proper indications in all modes. The first officer FMC showed improper indications in all modes except vertical navigation. Reported the problem to ATC, wrote the problem up in the aircraft logbook.

Original NASA ASRS Text

Title: ACR WDB OVERSHOT ALT ON CLIMB.

Narrative: DURING CLB, USING RIGHT AUTOPLT COMMANDED BY F/O FMC, IN FLT LEVEL CHANGE MODE, FLT WENT THROUGH THE PRESET 28000' LEVEL OFF ALT BY 400+'. RETURNED TO 28000'. LEFT FMC SHOWED THE PROPER INDICATIONS IN ALL MODES. THE F/O FMC SHOWED IMPROPER INDICATIONS IN ALL MODES EXCEPT VERTICAL NAV. RPTED THE PROB TO ATC, WROTE THE PROB UP IN THE ACFT LOGBOOK.

Data retrieved from NASA's ASRS site as of August 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.