Air carrier X climb to occupied altitude had near midair collision less than standard separation with air carrier Y. System error. TCASII RA evasive action taken.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	245445
Time
Date	199307
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : direct
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 : 8000 flight time type : 800
ASRS Report	245445
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot conflict : nmac non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was instructed by den approach to climb from 9000 ft to 10000 ft. At approximately 9500 ft we received a TCASII TA followed by a crossover climb RA due to an air carrier Y also at 10000 ft. The RA went to increase climb as we passed directly over the intruder. Air carrier Y executed a crossover descent. TCASII clearly saved the day. Vertical separation was reduced to less than 300 ft.

Original NASA ASRS Text

Title: ACR X CLB TO OCCUPIED ALT HAD NMAC LTSS WITH ACR Y. SYS ERROR. TCASII RA EVASIVE ACTION TAKEN.

Narrative: ACR X WAS INSTRUCTED BY DEN APCH TO CLB FROM 9000 FT TO 10000 FT. AT APPROX 9500 FT WE RECEIVED A TCASII TA FOLLOWED BY A CROSSOVER CLB RA DUE TO AN ACR Y ALSO AT 10000 FT. THE RA WENT TO INCREASE CLB AS WE PASSED DIRECTLY OVER THE INTRUDER. ACR Y EXECUTED A CROSSOVER DSCNT. TCASII CLEARLY SAVED THE DAY. VERT SEPARATION WAS REDUCED TO LESS THAN 300 FT.

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.