Flight crew of medium large transport overshot assigned altitude on SID out of ord.

Attributes
ACN	130465
Time
Date	198912
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5320
Environment
Flight Conditions	VMC
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 : initial cruise other
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 140 flight time total : 17000 flight time type : 600
ASRS Report	130465
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 50 flight time total : 7000 flight time type : 50
ASRS Report	130531
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Given a left turn to 180 degree for peotone and to maintain 5000'. Overshot altitude by approximately 320' and recovered immediately. Two reasons for the altitude overshoot are: 1) absence of aural altitude alert system. 2) use of a third altimeter. Pilot's and copilot's altimeters are set to QFE for landing and takeoff, while a center altimeter is set for qnh. This system negates the normal instrument scan by forcing pilots to look over to the third altimeter for correct MSL information. In this case, the pilot flying forgot to glance over to #3 or center altimeter and was using normal pilot scan, using an altimeter with a QFE setting therefore overshooting the assigned altitude. It is unnatural to have to break one's scan to check an altimeter that is on the center console. This is always a potential problem.

Original NASA ASRS Text

Title: FLT CREW OF MLG OVERSHOT ASSIGNED ALT ON SID OUT OF ORD.

Narrative: GIVEN A LEFT TURN TO 180 DEG FOR PEOTONE AND TO MAINTAIN 5000'. OVERSHOT ALT BY APPROX 320' AND RECOVERED IMMEDIATELY. TWO REASONS FOR THE ALT OVERSHOOT ARE: 1) ABSENCE OF AURAL ALT ALERT SYSTEM. 2) USE OF A THIRD ALTIMETER. PLT'S AND COPLT'S ALTIMETERS ARE SET TO QFE FOR LNDG AND TKOF, WHILE A CENTER ALTIMETER IS SET FOR QNH. THIS SYSTEM NEGATES THE NORMAL INSTRUMENT SCAN BY FORCING PLTS TO LOOK OVER TO THE THIRD ALTIMETER FOR CORRECT MSL INFORMATION. IN THIS CASE, THE PLT FLYING FORGOT TO GLANCE OVER TO #3 OR CENTER ALTIMETER AND WAS USING NORMAL PLT SCAN, USING AN ALTIMETER WITH A QFE SETTING THEREFORE OVERSHOOTING THE ASSIGNED ALT. IT IS UNNATURAL TO HAVE TO BREAK ONE'S SCAN TO CHECK AN ALTIMETER THAT IS ON THE CENTER CONSOLE. THIS IS ALWAYS A POTENTIAL PROBLEM.

Data retrieved from NASA's ASRS site as of August 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.