<< >> NASA ASRS Report 380950, September 1997

Flight crew of an air carrier descending on final increased descent past assigned altitude in response to a TCASII RA. ATC simultaneously issued a TA of unknown traffic and the other aircraft was sighted by the flight crew when it passed overhead.

Attributes
ACN	380950
Time
Date	199709
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 8700 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : las
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 enroute airway : las
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 1800
ASRS Report	380950
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 other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Cleared by approach to crane intersection and join the runway 25L localizer. Our flight was then cleared to 10000 ft and 210 KIAS. Shortly afterwards received a TCASII TA. Traffic appeared at 12 O'clock position and the same altitude. About 5 seconds later received an RA with command to descend. A descent and turn was accomplished about the same time ATC gave us a warning of unknown traffic at 12 O'clock position at 10000 ft. A descent to 8700 ft was accomplished before a 'clear of conflict' advisory was received. Traffic passed by our left side and slightly above. Continued approach at 9000 ft.

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Original NASA ASRS Text

Title: FLC OF AN ACR DSNDING ON FINAL INCREASED DSCNT PAST ASSIGNED ALT IN RESPONSE TO A TCASII RA. ATC SIMULTANEOUSLY ISSUED A TA OF UNKNOWN TFC AND THE OTHER ACFT WAS SIGHTED BY THE FLC WHEN IT PASSED OVERHEAD.

Narrative: CLRED BY APCH TO CRANE INTXN AND JOIN THE RWY 25L LOC. OUR FLT WAS THEN CLRED TO 10000 FT AND 210 KIAS. SHORTLY AFTERWARDS RECEIVED A TCASII TA. TFC APPEARED AT 12 O'CLOCK POS AND THE SAME ALT. ABOUT 5 SECONDS LATER RECEIVED AN RA WITH COMMAND TO DSND. A DSCNT AND TURN WAS ACCOMPLISHED ABOUT THE SAME TIME ATC GAVE US A WARNING OF UNKNOWN TFC AT 12 O'CLOCK POS AT 10000 FT. A DSCNT TO 8700 FT WAS ACCOMPLISHED BEFORE A 'CLR OF CONFLICT' ADVISORY WAS RECEIVED. TFC PASSED BY OUR L SIDE AND SLIGHTLY ABOVE. CONTINUED APCH AT 9000 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.