A B727 has a close encounter with a light aircraft 30 mi from phl, PA.

Attributes
ACN	436090
Time
Date	199905
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl bound lower : 5800 msl bound upper : 6300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 3500
ASRS Report	436090
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne critical non adherence : far
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took evasive action
Miss Distance	vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Environmental Factor Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

While descending to 6000 ft, a TA warning sounded at 6800 ft. At 6300 ft an RA alert sounded and I immediately climbed to 7000 ft. Approach was advised and they stated that they also had a traffic alert. TCASII showed the other aircraft to be 500 ft below our altitude at the time I responded to the RA.

Original NASA ASRS Text

Title: A B727 HAS A CLOSE ENCOUNTER WITH A LIGHT ACFT 30 MI FROM PHL, PA.

Narrative: WHILE DSNDING TO 6000 FT, A TA WARNING SOUNDED AT 6800 FT. AT 6300 FT AN RA ALERT SOUNDED AND I IMMEDIATELY CLBED TO 7000 FT. APCH WAS ADVISED AND THEY STATED THAT THEY ALSO HAD A TFC ALERT. TCASII SHOWED THE OTHER ACFT TO BE 500 FT BELOW OUR ALT AT THE TIME I RESPONDED TO THE RA.

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.