Altitude deviation altitude undershot on descent to a landing after TCASII RA causes flight crew response of evasive action climb. Proximity of multiple airports.

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Attributes
ACN	260108
Time
Date	199312
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	msl bound lower : 1500 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : straight in approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff climbout : initial
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 1500
ASRS Report	260108
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on a visual approach to sea runway 16L received several TA's due to traffic in bfi visual pattern. At approximately 1500 ft MSL received an RA of 'climb, climb, now' from TCASII. Responded immediately with climb attitude and thrust to over 2000 FPM as requested by TCASII computer. As soon as response was initiated, 'clear of conflict' was received. Restabilized on approach and landed without further incident. After landing first officer and captain riding jump seats both reported that the conflicting traffic on TCASII appeared to be directly below us climbing off of bfi.

Original NASA ASRS Text

Title: ALTDEV ALT UNDERSHOT ON DSCNT TO A LNDG AFTER TCASII RA CAUSES FLC RESPONSE OF EVASIVE ACTION CLB. PROX OF MULTIPLE ARPTS.

Narrative: WHILE ON A VISUAL APCH TO SEA RWY 16L RECEIVED SEVERAL TA'S DUE TO TFC IN BFI VISUAL PATTERN. AT APPROX 1500 FT MSL RECEIVED AN RA OF 'CLB, CLB, NOW' FROM TCASII. RESPONDED IMMEDIATELY WITH CLB ATTITUDE AND THRUST TO OVER 2000 FPM AS REQUESTED BY TCASII COMPUTER. AS SOON AS RESPONSE WAS INITIATED, 'CLR OF CONFLICT' WAS RECEIVED. RESTABILIZED ON APCH AND LANDED WITHOUT FURTHER INCIDENT. AFTER LNDG FO AND CAPT RIDING JUMP SEATS BOTH RPTED THAT THE CONFLICTING TFC ON TCASII APPEARED TO BE DIRECTLY BELOW US CLBING OFF OF BFI.

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.