<< >> NASA ASRS Report 581053, May 2003

Altitude excursion by a B737-300 flight crew for a TCASII RA when opposite direction traffic creates need for climb at lynsy intersection, nv.

Attributes
ACN	581053
Time
Date	200305
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : lynsy
State Reference	NV
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Route In Use	arrival star : lynsy
Flight Plan	IFR
Aircraft 2
Make Model Name	Piper Twin Piston Undifferentiated or Other Model
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 162 flight time total : 15012 flight time type : 10012
ASRS Report	581053
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 10000 vertical : 600
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance Aircraft
Primary Problem	Airspace Structure

Narrative:

Our flight was level at 12000 ft on the lynsy arrival into las, approaching lynsy. I (captain) saw aircraft approaching on TCASII. The aircraft was a piper twin. We tried to contact center to inquire, but frequency was congested. Received TCASII RA, complied and climbed to 13000 ft. Leveled off, while calling center. Center acknowledged and said to descend back to 12000 ft when clear of conflict. We descended after the TCASII RA was clear and we saw traffic passing off our left side.

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Original NASA ASRS Text

Title: ALT EXCURSION BY A B737-300 FLT CREW FOR A TCASII RA WHEN OPPOSITE DIRECTION TFC CREATES NEED FOR CLB AT LYNSY INTXN, NV.

Narrative: OUR FLT WAS LEVEL AT 12000 FT ON THE LYNSY ARR INTO LAS, APCHING LYNSY. I (CAPT) SAW ACFT APCHING ON TCASII. THE ACFT WAS A PIPER TWIN. WE TRIED TO CONTACT CTR TO INQUIRE, BUT FREQ WAS CONGESTED. RECEIVED TCASII RA, COMPLIED AND CLBED TO 13000 FT. LEVELED OFF, WHILE CALLING CTR. CTR ACKNOWLEDGED AND SAID TO DSND BACK TO 12000 FT WHEN CLR OF CONFLICT. WE DSNDED AFTER THE TCASII RA WAS CLR AND WE SAW TFC PASSING OFF OUR L SIDE.

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.