<< >> NASA ASRS Report 324850, December 1995

Miscom between ATC and flight crew. Each time altitude clearance was given, flight crew read it back. ATC questioned flight crew when climbing through the 'assigned,' but flight crew had read back the clearance prior.

Attributes
ACN	324850
Time
Date	199512
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 2000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 9000 flight time type : 4000
ASRS Report	324850
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

We took off on runway 31C out of mdw airport. Our clearance was to climb to 3000 ft, with a right turn to 090 degrees. When we called departure he said we were only cleared to 2000 ft, but climb and maintain 3000 ft. He then stated and we also repeated -- give me a good rate through 3000 ft, climb and maintain 12000 ft. He then stopped us at 4000 ft wanting to know what we were doing. We stayed at 4000 ft. Traffic went over us at 5000 ft. Major miscom contributed to this starting from departure not talking to the tower about what they needed. All our 'wrong' readbacks were missed also.

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Original NASA ASRS Text

Title: MISCOM BTWN ATC AND FLC. EACH TIME ALT CLRNC WAS GIVEN, FLC READ IT BACK. ATC QUESTIONED FLC WHEN CLBING THROUGH THE 'ASSIGNED,' BUT FLC HAD READ BACK THE CLRNC PRIOR.

Narrative: WE TOOK OFF ON RWY 31C OUT OF MDW ARPT. OUR CLRNC WAS TO CLB TO 3000 FT, WITH A R TURN TO 090 DEGS. WHEN WE CALLED DEP HE SAID WE WERE ONLY CLRED TO 2000 FT, BUT CLB AND MAINTAIN 3000 FT. HE THEN STATED AND WE ALSO REPEATED -- GIVE ME A GOOD RATE THROUGH 3000 FT, CLB AND MAINTAIN 12000 FT. HE THEN STOPPED US AT 4000 FT WANTING TO KNOW WHAT WE WERE DOING. WE STAYED AT 4000 FT. TFC WENT OVER US AT 5000 FT. MAJOR MISCOM CONTRIBUTED TO THIS STARTING FROM DEP NOT TALKING TO THE TWR ABOUT WHAT THEY NEEDED. ALL OUR 'WRONG' READBACKS WERE MISSED ALSO.

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.