B767 crew had altitude overshoots.

Attributes
ACN	443830
Time
Date	199907
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc.airport
State Reference	UT
Altitude	msl bound lower : 14000 msl bound upper : 14400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s56.tracon
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 20000 flight time type : 450
ASRS Report	443830
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment : altitude alert
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing slc to the south, operations were normal, with the exception of multiple airspeed restrs, until given a leveloff altitude of 14000 ft. Captain was hand flying aircraft with autothrottle engaged. At 14250 ft, altitude alert came on and captain retarded throttles and pitched nose down and regained altitude (ie, 14000 ft). Deviation was close to 400 ft above assigned altitude. A factor was that the autothrottle did not retard and flight director did not command a leveloff. Tried to duplicate this situation on a subsequent leg (same aircraft) and only partially had similar results. They were: autothrottle retarded throttles at about 200 ft above leveloff altitude. However, flight director commands seemed to work properly. There was not enough discrepancy to warrant a write-up, and crew surmised that problem was a result of programming or electronic glitches.

Original NASA ASRS Text

Title: B767 CREW HAD ALT OVERSHOOTS.

Narrative: DEPARTING SLC TO THE S, OPS WERE NORMAL, WITH THE EXCEPTION OF MULTIPLE AIRSPD RESTRS, UNTIL GIVEN A LEVELOFF ALT OF 14000 FT. CAPT WAS HAND FLYING ACFT WITH AUTOTHROTTLE ENGAGED. AT 14250 FT, ALT ALERT CAME ON AND CAPT RETARDED THROTTLES AND PITCHED NOSE DOWN AND REGAINED ALT (IE, 14000 FT). DEV WAS CLOSE TO 400 FT ABOVE ASSIGNED ALT. A FACTOR WAS THAT THE AUTOTHROTTLE DID NOT RETARD AND FLT DIRECTOR DID NOT COMMAND A LEVELOFF. TRIED TO DUPLICATE THIS SIT ON A SUBSEQUENT LEG (SAME ACFT) AND ONLY PARTIALLY HAD SIMILAR RESULTS. THEY WERE: AUTOTHROTTLE RETARDED THROTTLES AT ABOUT 200 FT ABOVE LEVELOFF ALT. HOWEVER, FLT DIRECTOR COMMANDS SEEMED TO WORK PROPERLY. THERE WAS NOT ENOUGH DISCREPANCY TO WARRANT A WRITE-UP, AND CREW SURMISED THAT PROB WAS A RESULT OF PROGRAMMING OR ELECTRONIC GLITCHES.

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.