Flight crew failed to contact tower as instructed by approach control during an approach resulting in tower intervention in order to establish contact. Approach control failed to respond to an improper readback from the flight crew.

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Attributes
ACN	382470
Time
Date	199710
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord tower : mdw tower : hkg
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 6700 flight time type : 700
ASRS Report	382470
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC stated to contact tower and tower will give clearance to leave 2500 ft. I heard and read back 'call tower when leaving 2500 ft.' when aircraft was about 3 NM west of mdw (in a right turn to enter base) ATC (119.35 or 119.85) called us and told us of our error. No evasive action required, no other aircraft seen. Better communications on both sides of the radio could have helped avoid this mistake. Also it is uncommon to receive such an instruction from ATC/tower. Extra caution on part of ATC should have been given.

Original NASA ASRS Text

Title: FLC FAILED TO CONTACT TWR AS INSTRUCTED BY APCH CTL DURING AN APCH RESULTING IN TWR INTERVENTION IN ORDER TO ESTABLISH CONTACT. APCH CTL FAILED TO RESPOND TO AN IMPROPER READBACK FROM THE FLC.

Narrative: ATC STATED TO CONTACT TWR AND TWR WILL GIVE CLRNC TO LEAVE 2500 FT. I HEARD AND READ BACK 'CALL TWR WHEN LEAVING 2500 FT.' WHEN ACFT WAS ABOUT 3 NM W OF MDW (IN A R TURN TO ENTER BASE) ATC (119.35 OR 119.85) CALLED US AND TOLD US OF OUR ERROR. NO EVASIVE ACTION REQUIRED, NO OTHER ACFT SEEN. BETTER COMS ON BOTH SIDES OF THE RADIO COULD HAVE HELPED AVOID THIS MISTAKE. ALSO IT IS UNCOMMON TO RECEIVE SUCH AN INSTRUCTION FROM ATC/TWR. EXTRA CAUTION ON PART OF ATC SHOULD HAVE BEEN GIVEN.

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.