TCAS motivated altitude deviation.

Attributes
ACN	182275
Time
Date	199106
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 9700 msl bound upper : 10500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit artcc : czeg
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Aircraft
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 130 flight time total : 14000 flight time type : 9000
ASRS Report	182275
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

As we were approaching pit for an ILS 32 approach, at approximately 9700' on localizer, while descending to 6000', we had a TCAS TA followed shortly (3-4 seconds) by a TCAS RA for an immediate maximum climb. We climbed to approximately 10500' and the TCAS advisory stopped. I advised RAPCON that we made a TCAS induced climb. The controller then mentioned that some VFR traffic had popped up. We then continued the approach and landed on runway 32. Later, while on the phone with the tower supervisor, he indicated that there was a VFR small aircraft in the area that had not taken an assigned turn. I feel that TCAS really performed well on this and quite possible prevented an accident.

Original NASA ASRS Text

Title: TCAS MOTIVATED ALT DEVIATION.

Narrative: AS WE WERE APCHING PIT FOR AN ILS 32 APCH, AT APPROX 9700' ON LOC, WHILE DSNDING TO 6000', WE HAD A TCAS TA FOLLOWED SHORTLY (3-4 SECS) BY A TCAS RA FOR AN IMMEDIATE MAX CLB. WE CLBED TO APPROX 10500' AND THE TCAS ADVISORY STOPPED. I ADVISED RAPCON THAT WE MADE A TCAS INDUCED CLB. THE CTLR THEN MENTIONED THAT SOME VFR TFC HAD POPPED UP. WE THEN CONTINUED THE APCH AND LANDED ON RWY 32. LATER, WHILE ON THE PHONE WITH THE TWR SUPVR, HE INDICATED THAT THERE WAS A VFR SMA IN THE AREA THAT HAD NOT TAKEN AN ASSIGNED TURN. I FEEL THAT TCAS REALLY PERFORMED WELL ON THIS AND QUITE POSSIBLE PREVENTED AN ACCIDENT.

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.