Commuter aircraft has TCASII TA then RA to climb.

Attributes
ACN	263870
Time
Date	199402
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 16000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Saab-Scania Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 350 flight time total : 20000 flight time type : 100
ASRS Report	263870
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Air Traffic Incident	Pilot Deviation other

Narrative:

En route of flight shuttle bos-lga at 16000 ft, heading west, ZBW advised us that we had VFR traffic at approximately our 11 O'clock position heading east and climbing to 15500 ft and closing on us. We tried to get a visual on this traffic (a saab). Shortly thereafter, we got a TCASII advisory and then a TCASII command to 'climb, climb.' I did, to 17000 ft, and shortly thereafter back to 16000 ft after the traffic passed below us. In our climb to 17000 ft our TCASII showed the traffic passed below us at 400 ft and climbing. After we went back to 16000 ft the rest of our flight was normal. We never did get a visual on that other traffic.

Original NASA ASRS Text

Title: COMMUTER ACFT HAS TCASII TA THEN RA TO CLB.

Narrative: ENRTE OF FLT SHUTTLE BOS-LGA AT 16000 FT, HDG W, ZBW ADVISED US THAT WE HAD VFR TFC AT APPROX OUR 11 O'CLOCK POS HDG E AND CLBING TO 15500 FT AND CLOSING ON US. WE TRIED TO GET A VISUAL ON THIS TFC (A SAAB). SHORTLY THEREAFTER, WE GOT A TCASII ADVISORY AND THEN A TCASII COMMAND TO 'CLB, CLB.' I DID, TO 17000 FT, AND SHORTLY THEREAFTER BACK TO 16000 FT AFTER THE TFC PASSED BELOW US. IN OUR CLB TO 17000 FT OUR TCASII SHOWED THE TFC PASSED BELOW US AT 400 FT AND CLBING. AFTER WE WENT BACK TO 16000 FT THE REST OF OUR FLT WAS NORMAL. WE NEVER DID GET A VISUAL ON THAT OTHER TFC.

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.