<< >> NASA ASRS Report 203005, February 1992

ARTCC controller gives clearance for crossing restriction with speed late, and flight crew cannot comply with speed, but gets altitude. Frequency congestion prevents flight crew from advising controller.

Attributes
ACN	203005
Time
Date	199202
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bdf
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 230 flight time total : 16000 flight time type : 3600
ASRS Report	203005
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Due to controller training, received late handoff over bdf to low altitude controller. At 23 northeast bdf, 24000 ft and 300 KTS received clearance to cross shooz intersection at 11000 ft and 250 KTS. As I initiated descent I realized we would be unable to comply with both altitude and airspeed restrictions. Unable to inform controller due to frequency congestion. Not knowing which was the more restrictive, dove for 11000. As we approached shooz, controller gave us a vector off the arrival route and questioned our airspeed. I don't know how this could have been prevented unless a lower workload for controller or some other method to reduce radio congestion could be found.

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Original NASA ASRS Text

Title: ARTCC CTLR GIVES CLRNC FOR XING RESTRICTION WITH SPD LATE, AND FLC CANNOT COMPLY WITH SPD, BUT GETS ALT. FREQ CONGESTION PREVENTS FLC FROM ADVISING CTLR.

Narrative: DUE TO CTLR TRAINING, RECEIVED LATE HDOF OVER BDF TO LOW ALT CTLR. AT 23 NE BDF, 24000 FT AND 300 KTS RECEIVED CLRNC TO CROSS SHOOZ INTXN AT 11000 FT AND 250 KTS. AS I INITIATED DSCNT I REALIZED WE WOULD BE UNABLE TO COMPLY WITH BOTH ALT AND AIRSPD RESTRICTIONS. UNABLE TO INFORM CTLR DUE TO FREQ CONGESTION. NOT KNOWING WHICH WAS THE MORE RESTRICTIVE, DOVE FOR 11000. AS WE APCHED SHOOZ, CTLR GAVE US A VECTOR OFF THE ARR RTE AND QUESTIONED OUR AIRSPD. I DON'T KNOW HOW THIS COULD HAVE BEEN PREVENTED UNLESS A LOWER WORKLOAD FOR CTLR OR SOME OTHER METHOD TO REDUCE RADIO CONGESTION COULD BE FOUND.

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.