Close proximity air carrier-medium large transport GA-small aircraft 25 northwest of phl.

Attributes
ACN	192228
Time
Date	199110
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 7500 msl bound upper : 7800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 9500 flight time type : 5700
ASRS Report	192229
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 800 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In VFR conditions we were cleared from 11000 ft to 5000 ft. Approaching 8000 ft at 1500 FPM descent rate, approach reported traffic at our 1 O'clock position and about 2 mi at 7500 ft heading our direction. About same time TCASII gave a TA and graphically gave position and showed it to be approximately 600 ft below. A couple seconds later the first officer and I both got a visual on the traffic (low wing, single engine, small aircraft type) about the same time TCASII gave an RA telling us to climb. Stopped descent at about 7600 ft and climbed to 7800 ft. Other aircraft saw us about same time we started climb and he initiated a hard left turn to pass behind us. TCASII gave us the correct evasive maneuver quicker than we would have by making visual contact then studying the situation to determine what needed to be done. 'TCASII works!'

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMA 25 NW OF PHL.

Narrative: IN VFR CONDITIONS WE WERE CLRED FROM 11000 FT TO 5000 FT. APCHING 8000 FT AT 1500 FPM DSCNT RATE, APCH RPTED TFC AT OUR 1 O'CLOCK POS AND ABOUT 2 MI AT 7500 FT HDG OUR DIRECTION. ABOUT SAME TIME TCASII GAVE A TA AND GRAPHICALLY GAVE POS AND SHOWED IT TO BE APPROX 600 FT BELOW. A COUPLE SECONDS LATER THE FO AND I BOTH GOT A VISUAL ON THE TFC (LOW WING, SINGLE ENG, SMA TYPE) ABOUT THE SAME TIME TCASII GAVE AN RA TELLING US TO CLB. STOPPED DSCNT AT ABOUT 7600 FT AND CLBED TO 7800 FT. OTHER ACFT SAW US ABOUT SAME TIME WE STARTED CLB AND HE INITIATED A HARD L TURN TO PASS BEHIND US. TCASII GAVE US THE CORRECT EVASIVE MANEUVER QUICKER THAN WE WOULD HAVE BY MAKING VISUAL CONTACT THEN STUDYING THE SITUATION TO DETERMINE WHAT NEEDED TO BE DONE. 'TCASII WORKS!'

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.