<< >> NASA ASRS Report 137916, February 1990

Altitude bust.

Attributes
ACN	137916
Time
Date	199002
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cgt
State Reference	IL
Altitude	msl bound lower : 6500 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other cruise other descent other
Route In Use	arrival other enroute airway : v92 enroute 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 : 150 flight time total : 5500
ASRS Report	137916
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far other anomaly other
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

On descent to 7000' I was describing standard and normally expected clrncs that our airline receives going into midway airport. The copilot was flying and had little experience in this type of aircraft. He became distracted as was I and descended below 7000' with the intention of leveling at 6000' (which is standard for this arrival sector). ATC queried us about our altitude thus alerting us to the deviation. A contributing factor is the nonstandardized altitude alert system on the air carrier fleet. There are 3 different systems installed in differing locations with differing warnings. For the most part we, as a crew, rely on each other for altitude alerts.

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Original NASA ASRS Text

Title: ALT BUST.

Narrative: ON DSCNT TO 7000' I WAS DESCRIBING STANDARD AND NORMALLY EXPECTED CLRNCS THAT OUR AIRLINE RECEIVES GOING INTO MIDWAY ARPT. THE COPLT WAS FLYING AND HAD LITTLE EXPERIENCE IN THIS TYPE OF ACFT. HE BECAME DISTRACTED AS WAS I AND DESCENDED BELOW 7000' WITH THE INTENTION OF LEVELING AT 6000' (WHICH IS STANDARD FOR THIS ARR SECTOR). ATC QUERIED US ABOUT OUR ALT THUS ALERTING US TO THE DEVIATION. A CONTRIBUTING FACTOR IS THE NONSTANDARDIZED ALT ALERT SYSTEM ON THE ACR FLEET. THERE ARE 3 DIFFERENT SYSTEMS INSTALLED IN DIFFERING LOCATIONS WITH DIFFERING WARNINGS. FOR THE MOST PART WE, AS A CREW, RELY ON EACH OTHER FOR ALT ALERTS.

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.