B727 sights C172 passing below left to right.

Attributes
ACN	321515
Time
Date	199511
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : den tracon : dtw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 19400 flight time type : 4000
ASRS Report	321515
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On approach runway 35L at denver international -- I was flying the aircraft at the OM. A small (cessna 172?) passed beneath our B727 left to right about 200 ft. Small aircraft had no apparent transponder as no TCASII TA/RA.

Original NASA ASRS Text

Title: B727 SIGHTS C172 PASSING BELOW L TO R.

Narrative: ON APCH RWY 35L AT DENVER INTL -- I WAS FLYING THE ACFT AT THE OM. A SMALL (CESSNA 172?) PASSED BENEATH OUR B727 L TO R ABOUT 200 FT. SMALL ACFT HAD NO APPARENT XPONDER AS NO TCASII TA/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.