A DC9-30 captain reported that he missed a crossing restr over qball intersection due to a high workload associated with IMC, icing, continuous turbulence, and vector changes.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	491600
Time
Date	200011
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : qball
State Reference	MO
Altitude	msl bound lower : 11000 msl bound upper : 13000
Environment
Flight Conditions	IMC
Weather Elements	Ice Turbulence
Light	Night
Aircraft 1
Controlling Facilities	artcc : zkc.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach
Route In Use	arrival star : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 9000
ASRS Report	491600
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On qball 4 arrival to stl, ZKC. Conditions were 'intense' -- IMC, icing, and continuous moderate turbulence. Center vectored us off the arrival for spacing several times. Finally received a vector to reintercept the arrival along with a crossing restr at qball intersection. However, we missed the crossing restr partly due to the extremely high workload and interpreted the clearance to be a 'descend to' altitude rather than an actual crossing restr. While we were a few mi outside qball, center asked about our altitude. He then requested we expedite our descent to (I believe) 11000 ft. No further vectors off course were received and we flew the remaining portion of the arrival as published.

Original NASA ASRS Text

Title: A DC9-30 CAPT RPTED THAT HE MISSED A XING RESTR OVER QBALL INTXN DUE TO A HIGH WORKLOAD ASSOCIATED WITH IMC, ICING, CONTINUOUS TURB, AND VECTOR CHANGES.

Narrative: ON QBALL 4 ARR TO STL, ZKC. CONDITIONS WERE 'INTENSE' -- IMC, ICING, AND CONTINUOUS MODERATE TURB. CTR VECTORED US OFF THE ARR FOR SPACING SEVERAL TIMES. FINALLY RECEIVED A VECTOR TO REINTERCEPT THE ARR ALONG WITH A XING RESTR AT QBALL INTXN. HOWEVER, WE MISSED THE XING RESTR PARTLY DUE TO THE EXTREMELY HIGH WORKLOAD AND INTERPED THE CLRNC TO BE A 'DSND TO' ALT RATHER THAN AN ACTUAL XING RESTR. WHILE WE WERE A FEW MI OUTSIDE QBALL, CTR ASKED ABOUT OUR ALT. HE THEN REQUESTED WE EXPEDITE OUR DSCNT TO (I BELIEVE) 11000 FT. NO FURTHER VECTORS OFF COURSE WERE RECEIVED AND WE FLEW THE REMAINING PORTION OF THE ARR AS PUBLISHED.

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.