<< >> NASA ASRS Report 299870, March 1995

Altitude deviation altitude overshot - flight crew became distracted and descended below the cleared altitude then immediately corrected.

Attributes
ACN	299870
Time
Date	199503
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 4600 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	299870
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	299869
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Being hand flown by first officer and being vectored to final approach to runway 9R at ord. ATC gave instruction to fly 120 degrees to intercept final and to descend from 6000 ft to 5000 ft. Nearing level off at 5000 ft, the crew became distracted looking for traffic ahead and descended to between 4600 ft and 4700 ft. Received altitude alert from aircraft and immediately returned to 5000 ft. At the same time the aircraft returned to 5000 ft, ATC cleared flight to 4000 ft and then cleared flight for the approach. Nothing was mentioned by ATC concerning this altitude deviation and the remainder of the approach was normal. WX at the time of incident was VMC.

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Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT - FLC BECAME DISTRACTED AND DSNDED BELOW THE CLRED ALT THEN IMMEDIATELY CORRECTED.

Narrative: BEING HAND FLOWN BY FO AND BEING VECTORED TO FINAL APCH TO RWY 9R AT ORD. ATC GAVE INSTRUCTION TO FLY 120 DEGS TO INTERCEPT FINAL AND TO DSND FROM 6000 FT TO 5000 FT. NEARING LEVEL OFF AT 5000 FT, THE CREW BECAME DISTRACTED LOOKING FOR TFC AHEAD AND DSNDED TO BTWN 4600 FT AND 4700 FT. RECEIVED ALT ALERT FROM ACFT AND IMMEDIATELY RETURNED TO 5000 FT. AT THE SAME TIME THE ACFT RETURNED TO 5000 FT, ATC CLRED FLT TO 4000 FT AND THEN CLRED FLT FOR THE APCH. NOTHING WAS MENTIONED BY ATC CONCERNING THIS ALT DEV AND THE REMAINDER OF THE APCH WAS NORMAL. WX AT THE TIME OF INCIDENT WAS VMC.

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.