<< >> NASA ASRS Report 405495, June 1998

During descent into mco airport, flight crew received TCASII TA and ARTCC controller changed assigned altitude.

Attributes
ACN	405495
Time
Date	199806
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rsw
State Reference	FL
Altitude	msl bound lower : 13000 msl bound upper : 14500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	Xingu EMB-121 All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3900 flight time type : 550
ASRS Report	405495
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were at cruise 17000 ft when cleared by ZMA to descend to 13000 ft MSL. Captain was operating the radios. I was PF. Captain acknowledged 13000 ft. I confirmed and began descent. At 14800 ft MSL, I noticed another aircraft on TCASII climbing within 5 mi. At 14500 ft MSL, I slowed descent. Almost immediately received TCASII warning 'traffic.' other aircraft passed approximately 500 ft below. ZMA called, changed our altitude to 14000 ft MSL. We were on the minee 3 arrival into orl airport. Controller inquired as to altitude assigned and I responded to her as 13000 ft MSL. She then assigned the 14000 ft MSL altitude.

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Original NASA ASRS Text

Title: DURING DSCNT INTO MCO ARPT, FLC RECEIVED TCASII TA AND ARTCC CTLR CHANGED ASSIGNED ALT.

Narrative: WE WERE AT CRUISE 17000 FT WHEN CLRED BY ZMA TO DSND TO 13000 FT MSL. CAPT WAS OPERATING THE RADIOS. I WAS PF. CAPT ACKNOWLEDGED 13000 FT. I CONFIRMED AND BEGAN DSCNT. AT 14800 FT MSL, I NOTICED ANOTHER ACFT ON TCASII CLBING WITHIN 5 MI. AT 14500 FT MSL, I SLOWED DSCNT. ALMOST IMMEDIATELY RECEIVED TCASII WARNING 'TFC.' OTHER ACFT PASSED APPROX 500 FT BELOW. ZMA CALLED, CHANGED OUR ALT TO 14000 FT MSL. WE WERE ON THE MINEE 3 ARR INTO ORL ARPT. CTLR INQUIRED AS TO ALT ASSIGNED AND I RESPONDED TO HER AS 13000 FT MSL. SHE THEN ASSIGNED THE 14000 FT MSL ALT.

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.