Air carrier a is climbed through air carrier B altitude. TCASII saved the day.

Attributes
ACN	296048
Time
Date	199409
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 14000 msl bound upper : 14000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tracon : n90
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
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 : 17000 flight time type : 800
ASRS Report	296048
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier flight xx (similar sounding a/north) ewr-mdw. While climbing to assigned altitude of 16000 ft I experienced a near miss appearing to be within 500 ft with air carrier B flight ghxx (similar sounding a/north) at 14000 ft. I executed hard maneuvering to avoid collision. ATC issued instruction for me to turn to avoid after I had passed air carrier B on his left side. Controller error in my clearance to climb through air carrier B flight path. TCASII saved the day on this one.

Original NASA ASRS Text

Title: ACR A IS CLBED THROUGH ACR B ALT. TCASII SAVED THE DAY.

Narrative: ACR FLT XX (SIMILAR SOUNDING A/N) EWR-MDW. WHILE CLBING TO ASSIGNED ALT OF 16000 FT I EXPERIENCED A NEAR MISS APPEARING TO BE WITHIN 500 FT WITH ACR B FLT GHXX (SIMILAR SOUNDING A/N) AT 14000 FT. I EXECUTED HARD MANEUVERING TO AVOID COLLISION. ATC ISSUED INSTRUCTION FOR ME TO TURN TO AVOID AFTER I HAD PASSED ACR B ON HIS L SIDE. CTLR ERROR IN MY CLRNC TO CLB THROUGH ACR B FLT PATH. TCASII SAVED THE DAY ON THIS ONE.

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.