Large transport climbed 200' to resolve TCAS ii RA.

Attributes
ACN	171767
Time
Date	199103
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sby
State Reference	MD
Altitude	msl bound lower : 29000 msl bound upper : 29200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j79
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8850 flight time type : 3500
ASRS Report	171767
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 14000 flight time type : 300
ASRS Report	171761
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Air Traffic Incident	other

Narrative:

Cruising north on J79 at FL290, I noticed a southbound aircraft on the TCAS approaching at FL282. It triggered a traffic alert, but I could not pick it up visually. When it caused an RA with the red vertical speed bar up to 0, I informed center and started a slight climb to get out of the red bar and eliminate the RA. Prior to initiating the climb, I noticed that there were no aircraft in front and above on the TCAS. I climbed 200' to about 292. The red bar received and I returned to FL290. I was unable to pick up the aircraft visually. There was no danger of a collision that I could see. It appears that this was caused by the other aircraft flying 200' high, or its equipment reporting in accurately. Our TCAS showed al aircraft on flight level. This was not a dangerous situation. The RA response and report were made to document TCAS performance.

Original NASA ASRS Text

Title: LGT CLIMBED 200' TO RESOLVE TCAS II RA.

Narrative: CRUISING N ON J79 AT FL290, I NOTICED A SBND ACFT ON THE TCAS APCHING AT FL282. IT TRIGGERED A TFC ALERT, BUT I COULD NOT PICK IT UP VISUALLY. WHEN IT CAUSED AN RA WITH THE RED VERT SPD BAR UP TO 0, I INFORMED CENTER AND STARTED A SLIGHT CLB TO GET OUT OF THE RED BAR AND ELIMINATE THE RA. PRIOR TO INITIATING THE CLB, I NOTICED THAT THERE WERE NO ACFT IN FRONT AND ABOVE ON THE TCAS. I CLBED 200' TO ABOUT 292. THE RED BAR RECEIVED AND I RETURNED TO FL290. I WAS UNABLE TO PICK UP THE ACFT VISUALLY. THERE WAS NO DANGER OF A COLLISION THAT I COULD SEE. IT APPEARS THAT THIS WAS CAUSED BY THE OTHER ACFT FLYING 200' HIGH, OR ITS EQUIP RPTING IN ACCURATELY. OUR TCAS SHOWED AL ACFT ON FLT LEVEL. THIS WAS NOT A DANGEROUS SITUATION. THE RA RESPONSE AND RPT WERE MADE TO DOCUMENT TCAS PERFORMANCE.

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.