Near midair collision between medium large transport on an ILS final and an unknown aircraft. Tower controller claimed that both aircraft were insight.

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Attributes
ACN	313172
Time
Date	199508
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 1400 msl bound upper : 1400
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : phl tower : phl
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
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 : 10000 flight time type : 5000
ASRS Report	313172
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 100
Supplementary
Primary Problem	ATC Human Performance

Narrative:

Just after handoff from approach control to tower TCASII went to RA 01 indication. First officer was flying and made a level off until RA was satisfied. Then approach was continued. When asked, tower indicated she had both aircraft in sight. No warning was issued from either approach control or tower.

Original NASA ASRS Text

Title: NMAC BTWN MLG ON AN ILS FINAL AND AN UNKNOWN ACFT. TWR CTLR CLAIMED THAT BOTH ACFT WERE INSIGHT.

Narrative: JUST AFTER HDOF FROM APCH CTL TO TWR TCASII WENT TO RA 01 INDICATION. FO WAS FLYING AND MADE A LEVEL OFF UNTIL RA WAS SATISFIED. THEN APCH WAS CONTINUED. WHEN ASKED, TWR INDICATED SHE HAD BOTH ACFT IN SIGHT. NO WARNING WAS ISSUED FROM EITHER APCH CTL OR TWR.

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.