<< >> NASA ASRS Report 245696, July 1993

Medium large transport has TCASII TA on climb. Told assigned altitude changed but never received or acknowledged clearance.

Attributes
ACN	245696
Time
Date	199307
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 6000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 10900
ASRS Report	245696
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

After departure from stl contacted departure on 118.95. Given climb to 15000 ft, left turn 220 degrees or 240 degrees to intercept 198 degree radial stl VOR. Climbing through 7000 ft, got TCASII TA 2 O'clock, 3 mi, 400 ft. Spotted aircraft. Departure control then came on and asked our altitude. I told him 9200 ft and traffic in sight assuming he was going to tell me about the traffic that just went past us. Then departure control told us we were given 6000 ft, which we neither heard nor acknowledged. Through all this we missed our radial, which we then intercepted within 1 1/2 mins. Upon landing I called stl TRACON and talked to the area manager and found the controller had issued a 6000 ft clearance but it was accepted by another aircraft. Controller then corrected the other aircraft but did not reissue clearance to us. So he had no acknowledgement or verification from us.

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Original NASA ASRS Text

Title: MLG HAS TCASII TA ON CLB. TOLD ASSIGNED ALT CHANGED BUT NEVER RECEIVED OR ACKNOWLEDGED CLRNC.

Narrative: AFTER DEP FROM STL CONTACTED DEP ON 118.95. GIVEN CLB TO 15000 FT, L TURN 220 DEGS OR 240 DEGS TO INTERCEPT 198 DEG RADIAL STL VOR. CLBING THROUGH 7000 FT, GOT TCASII TA 2 O'CLOCK, 3 MI, 400 FT. SPOTTED ACFT. DEP CTL THEN CAME ON AND ASKED OUR ALT. I TOLD HIM 9200 FT AND TFC IN SIGHT ASSUMING HE WAS GOING TO TELL ME ABOUT THE TFC THAT JUST WENT PAST US. THEN DEP CTL TOLD US WE WERE GIVEN 6000 FT, WHICH WE NEITHER HEARD NOR ACKNOWLEDGED. THROUGH ALL THIS WE MISSED OUR RADIAL, WHICH WE THEN INTERCEPTED WITHIN 1 1/2 MINS. UPON LNDG I CALLED STL TRACON AND TALKED TO THE AREA MGR AND FOUND THE CTLR HAD ISSUED A 6000 FT CLRNC BUT IT WAS ACCEPTED BY ANOTHER ACFT. CTLR THEN CORRECTED THE OTHER ACFT BUT DID NOT REISSUE CLRNC TO US. SO HE HAD NO ACKNOWLEDGEMENT OR VERIFICATION FROM US.

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.