<< >> NASA ASRS Report 339415, June 1996

Aircraft equipment problem. Autoplt descended uncommanded. Flight crew disconnected it and climbed back to assigned altitude. Medium large transport.

Attributes
ACN	339415
Time
Date	199606
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : msp
State Reference	MN
Altitude	msl bound lower : 4650 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msp
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 13000 flight time type : 10000
ASRS Report	339415
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Autoplt descended at 400 FPM (uncommanded). We were maintaining 5000 ft. We caught it at 4650 ft and climbed back to 5000 ft. Autoplt was written up and replaced on arrival.

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Original NASA ASRS Text

Title: ACFT EQUIP PROB. AUTOPLT DSNDED UNCOMMANDED. FLC DISCONNECTED IT AND CLBED BACK TO ASSIGNED ALT. MLG.

Narrative: AUTOPLT DSNDED AT 400 FPM (UNCOMMANDED). WE WERE MAINTAINING 5000 FT. WE CAUGHT IT AT 4650 FT AND CLBED BACK TO 5000 FT. AUTOPLT WAS WRITTEN UP AND REPLACED ON ARR.

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.