Widebody transport has TCASII alert.

Attributes
ACN	276976
Time
Date	199407
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fll
State Reference	FL
Altitude	msl bound lower : 6000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
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
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 240 flight time total : 30000 flight time type : 160
ASRS Report	276976
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC cleared us from 5000 ft to 16000 ft. I missed captain's readback because I had slid seat back to adjust cabin temperatures. We leveled at 6000 ft. I had not heard 16000 ft for sure and thought I must have heard wrong. About 2 mins later we got a conflict alert on TCASII. We turned left 30 degrees and avoided the traffic. ATC told us it was known VFR at 5500 ft. Turns out we had been cleared to 16000 ft! After 33 yrs of checking and double checking, I let my guard down! I am not sure if the first officer who was flying heard the assigned altitude. From now on I will be a pilot first and an so last!

Original NASA ASRS Text

Title: WDB HAS TCASII ALERT.

Narrative: ATC CLRED US FROM 5000 FT TO 16000 FT. I MISSED CAPT'S READBACK BECAUSE I HAD SLID SEAT BACK TO ADJUST CABIN TEMPS. WE LEVELED AT 6000 FT. I HAD NOT HEARD 16000 FT FOR SURE AND THOUGHT I MUST HAVE HEARD WRONG. ABOUT 2 MINS LATER WE GOT A CONFLICT ALERT ON TCASII. WE TURNED L 30 DEGS AND AVOIDED THE TFC. ATC TOLD US IT WAS KNOWN VFR AT 5500 FT. TURNS OUT WE HAD BEEN CLRED TO 16000 FT! AFTER 33 YRS OF CHKING AND DOUBLE CHKING, I LET MY GUARD DOWN! I AM NOT SURE IF THE FO WHO WAS FLYING HEARD THE ASSIGNED ALT. FROM NOW ON I WILL BE A PLT FIRST AND AN SO LAST!

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.