<< >> NASA ASRS Report 431080, March 1999

An air carrier B737-400 flight crew report that their TCASII signaled an RA even though they were leveling 1000 ft below sighted traffic.

Attributes
ACN	431080
Time
Date	199903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : ewc.vortac
State Reference	PA
Altitude	msl bound lower : 23000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 2300
ASRS Report	431080
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We were cleared to climb to FL230. Passing FL220, TCASII issued a TA. Aircraft was spotted and confirmed to be level at FL240. As VNAV leveled aircraft at FL230, TCASII gave an RA to descend at 1500 FPM or greater. Other aircraft was still at FL240 and in visual sight so we did not descend and stayed level at FL230.

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Original NASA ASRS Text

Title: AN ACR B737-400 FLC RPT THAT THEIR TCASII SIGNALED AN RA EVEN THOUGH THEY WERE LEVELING 1000 FT BELOW SIGHTED TFC.

Narrative: WE WERE CLRED TO CLB TO FL230. PASSING FL220, TCASII ISSUED A TA. ACFT WAS SPOTTED AND CONFIRMED TO BE LEVEL AT FL240. AS VNAV LEVELED ACFT AT FL230, TCASII GAVE AN RA TO DSND AT 1500 FPM OR GREATER. OTHER ACFT WAS STILL AT FL240 AND IN VISUAL SIGHT SO WE DID NOT DSND AND STAYED LEVEL AT FL230.

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.