Altitude deviation. Excursion from assigned.

Attributes
ACN	140557
Time
Date	199003
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : fwa
State Reference	IN
Altitude	msl bound lower : 22000 msl bound upper : 22000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
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 : 210 flight time total : 9000 flight time type : 1400
ASRS Report	140557
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 2500 flight time type : 1200
ASRS Report	140551
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Autoplt coupled to perf (perf management system). Controller advised to slow for holding ahead. Aircraft slowed to 220 KIAS, then controller advised speed up to 320 KIAS. Speed was programmed into perf. Suddenly as aircraft was accelerating, aircraft left altitude and climbed 200' above assigned altitude before autoplt could be disconnected.

Original NASA ASRS Text

Title: ALT DEVIATION. EXCURSION FROM ASSIGNED.

Narrative: AUTOPLT COUPLED TO PERF (PERF MGMNT SYS). CTLR ADVISED TO SLOW FOR HOLDING AHEAD. ACFT SLOWED TO 220 KIAS, THEN CTLR ADVISED SPD UP TO 320 KIAS. SPD WAS PROGRAMMED INTO PERF. SUDDENLY AS ACFT WAS ACCELERATING, ACFT LEFT ALT AND CLBED 200' ABOVE ASSIGNED ALT BEFORE AUTOPLT COULD BE DISCONNECTED.

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.