<< >> NASA ASRS Report 466516, March 2000

A climbing B757 flight crew receives a false warning on their TCASII system 20 mi northwest of lga, ny.

Attributes
ACN	466516
Time
Date	200003
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	msl single value : 9500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon tower : dtw.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 1600
ASRS Report	466516
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment : tcas
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew other
Miss Distance	vertical : 100
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Climbing out of lga, received a TCASII TA, followed by an RA for a target that appeared to be at our 7 O'clock position, less than 1 mi behind us. This occurred in rapid sequence as we climbed out of 9500 ft. We were in IMC at the time. The TCASII RA called for a descent of at least 2000 FPM, and was complied with. After initiating the descent, the RA was no longer displayed. New york departure control was queried about any traffic in our vicinity that could have triggered a TCASII RA. There was none visible to the controller on his display. The climb was resumed. Several mins prior to the RA, there had been a momentary 'TCASII fail' annunciation on the TCASII display.

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Original NASA ASRS Text

Title: A CLBING B757 FLC RECEIVES A FALSE WARNING ON THEIR TCASII SYS 20 MI NW OF LGA, NY.

Narrative: CLBING OUT OF LGA, RECEIVED A TCASII TA, FOLLOWED BY AN RA FOR A TARGET THAT APPEARED TO BE AT OUR 7 O'CLOCK POS, LESS THAN 1 MI BEHIND US. THIS OCCURRED IN RAPID SEQUENCE AS WE CLBED OUT OF 9500 FT. WE WERE IN IMC AT THE TIME. THE TCASII RA CALLED FOR A DSCNT OF AT LEAST 2000 FPM, AND WAS COMPLIED WITH. AFTER INITIATING THE DSCNT, THE RA WAS NO LONGER DISPLAYED. NEW YORK DEP CTL WAS QUERIED ABOUT ANY TFC IN OUR VICINITY THAT COULD HAVE TRIGGERED A TCASII RA. THERE WAS NONE VISIBLE TO THE CTLR ON HIS DISPLAY. THE CLB WAS RESUMED. SEVERAL MINS PRIOR TO THE RA, THERE HAD BEEN A MOMENTARY 'TCASII FAIL' ANNUNCIATION ON THE TCASII DISPLAY.

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.