<< >> NASA ASRS Report 416604, October 1998

During departure climb, the flight crew of an saab SF340 descended in response to a TCASII RA as well as turned in compliance with departure controller's instructions. Unknown traffic appeared fast approaching causing both ATC and TCASII to issue resolution instructions.

Attributes
ACN	416604
Time
Date	199810
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : crg airport : crg
State Reference	FL
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax
Operator	common carrier : air carrier
Make Model Name	SF 340A
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
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 : 10000 flight time type : 3500
ASRS Report	416604
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Noted target at 1-2 O'clock on the TCASII during our climb. Traffic converging and pacing our clt rate. At first thought it was a 'ghost.' ATC then chimed in with a TA. The target went from a TA to an RA very rapidly and almost simultaneously ATC issued an immediate climb. The RA activated indicating a descent. Not having the target in sight, we followed the RA instructions. ATC also issued a turn to the east, away from the target. We stopped our descent at 11000 ft when the TCASII indicated clear of conflict. Never able to acquire target visually. Target continued on its course and we returned to our clearance shortly thereafter.

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Original NASA ASRS Text

Title: DURING DEP CLB, THE FLC OF AN SAAB SF340 DSNDED IN RESPONSE TO A TCASII RA AS WELL AS TURNED IN COMPLIANCE WITH DEP CTLR'S INSTRUCTIONS. UNKNOWN TFC APPEARED FAST APCHING CAUSING BOTH ATC AND TCASII TO ISSUE RESOLUTION INSTRUCTIONS.

Narrative: NOTED TARGET AT 1-2 O'CLOCK ON THE TCASII DURING OUR CLB. TFC CONVERGING AND PACING OUR CLT RATE. AT FIRST THOUGHT IT WAS A 'GHOST.' ATC THEN CHIMED IN WITH A TA. THE TARGET WENT FROM A TA TO AN RA VERY RAPIDLY AND ALMOST SIMULTANEOUSLY ATC ISSUED AN IMMEDIATE CLB. THE RA ACTIVATED INDICATING A DSCNT. NOT HAVING THE TARGET IN SIGHT, WE FOLLOWED THE RA INSTRUCTIONS. ATC ALSO ISSUED A TURN TO THE E, AWAY FROM THE TARGET. WE STOPPED OUR DSCNT AT 11000 FT WHEN THE TCASII INDICATED CLR OF CONFLICT. NEVER ABLE TO ACQUIRE TARGET VISUALLY. TARGET CONTINUED ON ITS COURSE AND WE RETURNED TO OUR CLRNC SHORTLY THEREAFTER.

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.