TCASII. Clearance confusion.

Attributes
ACN	312280
Time
Date	199508
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tpa
State Reference	FL
Altitude	msl bound lower : 23000 msl bound upper : 23500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zjx
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 15000 flight time type : 9000
ASRS Report	312280
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Jax cleared our flight to FL260 which we heard and read back. At FL230 we received a TCASII alert then RA to descend. Controller asked us if we were at FL230. We were at FL235 and returned to FL230. There was confusion as to which altitude we were cleared to.

Original NASA ASRS Text

Title: TCASII. CLRNC CONFUSION.

Narrative: JAX CLRED OUR FLT TO FL260 WHICH WE HEARD AND READ BACK. AT FL230 WE RECEIVED A TCASII ALERT THEN RA TO DSND. CTLR ASKED US IF WE WERE AT FL230. WE WERE AT FL235 AND RETURNED TO FL230. THERE WAS CONFUSION AS TO WHICH ALT WE WERE CLRED TO.

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.