A B777 experiences an overspd of 6 KTS momentarily during a mach pt 84 descent into ord, il.

Attributes
ACN	534860
Time
Date	200201
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : bdf.vortac
State Reference	IL
Altitude	msl single value : 31500
Environment
Weather Elements	Turbulence
Aircraft 1
Controlling Facilities	artcc : zau.artcc tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 9900
ASRS Report	534860
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter other other anomaly other anomaly
Independent Detector	aircraft equipment other aircraft equipment : ovspd warn other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : overrode automation
Consequence	other
Supplementary
Problem Areas	Aircraft Weather Flight Crew Human Performance
Primary Problem	Weather

Narrative:

Clear air in descent, light chop. Aircraft overspd 6 KTS for about 5 seconds in fltch mode, disconnected autoplt with slight pitch up maneuver. Gear up, flaps up, no passenger or flight attendant injuries noted or reported. .84 mach selected airspeed.

Original NASA ASRS Text

Title: A B777 EXPERIENCES AN OVERSPD OF 6 KTS MOMENTARILY DURING A MACH PT 84 DSCNT INTO ORD, IL.

Narrative: CLR AIR IN DSCNT, LIGHT CHOP. ACFT OVERSPD 6 KTS FOR ABOUT 5 SECONDS IN FLTCH MODE, DISCONNECTED AUTOPLT WITH SLIGHT PITCH UP MANEUVER. GEAR UP, FLAPS UP, NO PAX OR FLT ATTENDANT INJURIES NOTED OR RPTED. .84 MACH SELECTED AIRSPD.

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.