<< >> NASA ASRS Report 438234, May 1999

Flight crew of an air carrier descended in response to a TCASII RA resulting in descending into another air carrier aircraft's airspace.

Attributes
ACN	438234
Time
Date	199905
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zdc.artcc
State Reference	DC
Altitude	msl bound lower : 22000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 10
ASRS Report	438234
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Consequence	Other
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X northbound at FL250, aircraft Y sbound descending to FL220. Turned aircraft X to 090 degree heading. Aircraft X did not turn. Got in conflict with aircraft Y then descended for TCASII alert into other traffic at FL240.

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Original NASA ASRS Text

Title: FLC OF AN ACR DSNDED IN RESPONSE TO A TCASII RA RESULTING IN DSNDING INTO ANOTHER ACR ACFT'S AIRSPACE.

Narrative: ACFT X NBOUND AT FL250, ACFT Y SBOUND DSNDING TO FL220. TURNED ACFT X TO 090 DEG HDG. ACFT X DID NOT TURN. GOT IN CONFLICT WITH ACFT Y THEN DSNDED FOR TCASII ALERT INTO OTHER TFC AT FL240.

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.