Small aircraft on ILS approach makes go around due to traffic ahead and below.

Attributes
ACN	295252
Time
Date	199501
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cno
State Reference	CA
Altitude	msl bound lower : 1000 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cno
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
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	Part 91
Flight Phase	descent : approach
Person 1
Affiliation	Other
Function	other personnel other
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 8 flight time total : 3100 flight time type : 100
ASRS Report	295252
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While inbound on the ILS approach inside the OM, chino tower, acknowledged our aircraft when reported just after passing the OM. Tower frequency was extremely congested and numerous aircraft were in the pattern. I was watching out for other traffic when I saw at 1 O'clock low, a cessna 172 ahead and below us about a mi ahead of us. I advised the pilot executing the approach to level off and prepare for a go around since we had traffic below us. I was not able to talk to the tower. Momentarily due to frequency congestion, by the time I informed the tower, we had passed traffic below us and were going around. The pilot of C-172 said 'I want the #'south on that aircraft. He missed us by 25 ft' (this is not true for the closest proximity between the aircraft was in excess of 200 ft). We continued on the go around and re-entered the traffic pattern without any further incident. Upon landing, mr X walked up to us and said he got scared when he saw our shadow and thought we were too close to them, however I told him his aircraft was in plain sight at all times and at no time were they in danger of a midair collision. We all exchanged information andf departed.

Original NASA ASRS Text

Title: SMA ON ILS APCH MAKES GAR DUE TO TFC AHEAD AND BELOW.

Narrative: WHILE INBOUND ON THE ILS APCH INSIDE THE OM, CHINO TWR, ACKNOWLEDGED OUR ACFT WHEN RPTED JUST AFTER PASSING THE OM. TWR FREQ WAS EXTREMELY CONGESTED AND NUMEROUS ACFT WERE IN THE PATTERN. I WAS WATCHING OUT FOR OTHER TFC WHEN I SAW AT 1 O'CLOCK LOW, A CESSNA 172 AHEAD AND BELOW US ABOUT A MI AHEAD OF US. I ADVISED THE PLT EXECUTING THE APCH TO LEVEL OFF AND PREPARE FOR A GAR SINCE WE HAD TFC BELOW US. I WAS NOT ABLE TO TALK TO THE TWR. MOMENTARILY DUE TO FREQ CONGESTION, BY THE TIME I INFORMED THE TWR, WE HAD PASSED TFC BELOW US AND WERE GOING AROUND. THE PLT OF C-172 SAID 'I WANT THE #'S ON THAT ACFT. HE MISSED US BY 25 FT' (THIS IS NOT TRUE FOR THE CLOSEST PROX BTWN THE ACFT WAS IN EXCESS OF 200 FT). WE CONTINUED ON THE GAR AND RE-ENTERED THE TFC PATTERN WITHOUT ANY FURTHER INCIDENT. UPON LNDG, MR X WALKED UP TO US AND SAID HE GOT SCARED WHEN HE SAW OUR SHADOW AND THOUGHT WE WERE TOO CLOSE TO THEM, HOWEVER I TOLD HIM HIS ACFT WAS IN PLAIN SIGHT AT ALL TIMES AND AT NO TIME WERE THEY IN DANGER OF A MIDAIR COLLISION. WE ALL EXCHANGED INFO ANDF DEPARTED.

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.