F100 crew had a TCASII RA in ZJX class a airspace.

Attributes
ACN	506770
Time
Date	200104
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : szw.vortac
State Reference	FL
Altitude	msl bound lower : 28300 msl bound upper : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjt.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	506770
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other
Resolutory Action	flight crew : took evasive action other
Consequence	other
Miss Distance	horizontal : 6000 vertical : 700
Supplementary
Problem Areas	Company ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Altitude conflict. On apr/xa/01, I was the first officer flying as the PNF on flight from jax to ZZZ. ZJX cleared an air carrier Y to FL280. I asked if that was for air carrier X. The controller said 'affirmative, air carrier X cleared to FL290.' I set FL290 in the altitude select window. At approximately XA00Z passing through FL283, we received an RA then a TA on an rj that was 700 ft high and approximately 1 mi away. I can only assess that when the controller read back the clearance to us as flight X he meant FL280, but said FL290. I would guess the flight numbers are what got him mixed up -- flight Y to FL280 then correctly the flight number to X, but incorrectly changing the altitude to FL290.

Original NASA ASRS Text

Title: F100 CREW HAD A TCASII RA IN ZJX CLASS A AIRSPACE.

Narrative: ALT CONFLICT. ON APR/XA/01, I WAS THE FO FLYING AS THE PNF ON FLT FROM JAX TO ZZZ. ZJX CLRED AN ACR Y TO FL280. I ASKED IF THAT WAS FOR ACR X. THE CTLR SAID 'AFFIRMATIVE, ACR X CLRED TO FL290.' I SET FL290 IN THE ALT SELECT WINDOW. AT APPROX XA00Z PASSING THROUGH FL283, WE RECEIVED AN RA THEN A TA ON AN RJ THAT WAS 700 FT HIGH AND APPROX 1 MI AWAY. I CAN ONLY ASSESS THAT WHEN THE CTLR READ BACK THE CLRNC TO US AS FLT X HE MEANT FL280, BUT SAID FL290. I WOULD GUESS THE FLT NUMBERS ARE WHAT GOT HIM MIXED UP -- FLT Y TO FL280 THEN CORRECTLY THE FLT NUMBER TO X, BUT INCORRECTLY CHANGING THE ALT TO FL290.

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.