<< >> NASA ASRS Report 413215, September 1998

An air carrier medium large transport in descent received a TCASII TA followed by an RA at approximately FL305 on close proximity traffic. The controller had issued a clearance through an occupied altitude resulting in loss of separation.

Attributes
ACN	413215
Time
Date	199809
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bum
State Reference	MO
Altitude	msl bound lower : 30500 msl bound upper : 30500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 780
ASRS Report	413215
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 12600 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While in descent into stl we received a TA which then turned into an RA. We followed the RA and, at the same time, received instructions from ATC, which we followed. Once clear of traffic, we rejoined the arrival into stl.

Related reports:

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• Large transport flight crew had TCASII RA and climbed 300 ft...

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Original NASA ASRS Text

Title: AN ACR MLG IN DSCNT RECEIVED A TCASII TA FOLLOWED BY AN RA AT APPROX FL305 ON CLOSE PROX TFC. THE CTLR HAD ISSUED A CLRNC THROUGH AN OCCUPIED ALT RESULTING IN LOSS OF SEPARATION.

Narrative: WHILE IN DSCNT INTO STL WE RECEIVED A TA WHICH THEN TURNED INTO AN RA. WE FOLLOWED THE RA AND, AT THE SAME TIME, RECEIVED INSTRUCTIONS FROM ATC, WHICH WE FOLLOWED. ONCE CLR OF TFC, WE REJOINED THE ARR INTO STL.

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.