TCASII RA creates an altitude deviation evasive action climb by PIC.

Attributes
ACN	189076
Time
Date	199109
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 1000 msl bound upper : 1300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bos
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7300 flight time type : 2500
ASRS Report	189076
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Tower advised VFR traffic would be shooting visual approach to 4L at bos after clearing us for ILS 4R. Traffic approached within TCASII advisory area, giving us TA, then twice with resolution area, giving us 2 separate RA's. Captain added power, staged above GS until RA resolved. Notified bos tower of conflict. Filed TCASII report with company and FAA. Landed normally.

Original NASA ASRS Text

Title: TCASII RA CREATES AN ALT DEV EVASIVE ACTION CLB BY PIC.

Narrative: TWR ADVISED VFR TFC WOULD BE SHOOTING VISUAL APCH TO 4L AT BOS AFTER CLRING US FOR ILS 4R. TFC APCHED WITHIN TCASII ADVISORY AREA, GIVING US TA, THEN TWICE WITH RESOLUTION AREA, GIVING US 2 SEPARATE RA'S. CAPT ADDED PWR, STAGED ABOVE GS UNTIL RA RESOLVED. NOTIFIED BOS TWR OF CONFLICT. FILED TCASII RPT WITH COMPANY AND FAA. LANDED NORMALLY.

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.