A learjet 60 executed an 'RA climb' maneuver on final approach with no traffic in sight.

Attributes
ACN	636818
Time
Date	200411
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bed.airport
State Reference	MA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a90.tracon tower : bed.tower
Operator	general aviation : corporate
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 140 flight time total : 12850 flight time type : 1500
ASRS Report	636818
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : returned to original clearance flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

During the handoff from approach to local, my flight had an RA on unknown traffic 12 O'clock position low and converging. The PF (sic) followed the RA and I advised approach of the 'RA climb.' I believe that my transmission was blocked. Upon completion of the RA maneuver, I switched over to local. The other traffic was never in sight.

Original NASA ASRS Text

Title: A LEARJET 60 EXECUTED AN 'RA CLB' MANEUVER ON FINAL APCH WITH NO TFC IN SIGHT.

Narrative: DURING THE HDOF FROM APCH TO LCL, MY FLT HAD AN RA ON UNKNOWN TFC 12 O'CLOCK POS LOW AND CONVERGING. THE PF (SIC) FOLLOWED THE RA AND I ADVISED APCH OF THE 'RA CLB.' I BELIEVE THAT MY XMISSION WAS BLOCKED. UPON COMPLETION OF THE RA MANEUVER, I SWITCHED OVER TO LCL. THE OTHER TFC WAS NEVER IN SIGHT.

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.