Air carrier medium large transport altitude deviation overshot during climbout from ord.

Attributes
ACN	152464
Time
Date	199007
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 6000 msl bound upper : 6300
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 2100
ASRS Report	152464
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On departure from ord we were assigned 6000' simultaneously our heading systems showed a 20 degree difference, our autothrottles were inoperative, the thrust rating computer was inoperative and the performance management system was unusable. Numerous small trw's were also being encountered and we were attempting to remain clear of the storms. At this time we had an altitude excursion of +/-300'. Departure control stated they showed us at 6300'. The obvious cause of the excursion was over-saturation from trw avoidance, the inoperative systems and the heading system problem. The only way to prevent a recurrence of this type of problem is to limit the # of autoplt associated systems that can be inoperative on 2-M crews.

Original NASA ASRS Text

Title: ACR MLG ALT DEVIATION OVERSHOT DURING CLIMBOUT FROM ORD.

Narrative: ON DEP FROM ORD WE WERE ASSIGNED 6000' SIMULTANEOUSLY OUR HDG SYSTEMS SHOWED A 20 DEG DIFFERENCE, OUR AUTOTHROTTLES WERE INOP, THE THRUST RATING COMPUTER WAS INOP AND THE PERFORMANCE MGMNT SYS WAS UNUSABLE. NUMEROUS SMALL TRW'S WERE ALSO BEING ENCOUNTERED AND WE WERE ATTEMPTING TO REMAIN CLR OF THE STORMS. AT THIS TIME WE HAD AN ALT EXCURSION OF +/-300'. DEP CTL STATED THEY SHOWED US AT 6300'. THE OBVIOUS CAUSE OF THE EXCURSION WAS OVER-SATURATION FROM TRW AVOIDANCE, THE INOP SYSTEMS AND THE HDG SYS PROB. THE ONLY WAY TO PREVENT A RECURRENCE OF THIS TYPE OF PROB IS TO LIMIT THE # OF AUTOPLT ASSOCIATED SYSTEMS THAT CAN BE INOP ON 2-M CREWS.

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.