IFR training flight has near midair collision with aircraft approaching from behind.

Attributes
ACN	242734
Time
Date	199305
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : toa
State Reference	CA
Altitude	msl bound lower : 2100 msl bound upper : 2100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : toa
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach descent other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	other personnel other
Qualification	pilot : atp pilot : instrument pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 4000 flight time type : 10
ASRS Report	242734
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were on an IFR flight into the lax basin and decided to continue IFR for the approach into toa. Aircraft are held at 9000 ft to cross lax approach path, so coast took us south through toa localizer then back to a 330 degree heading at 3000 ft to descend and capture the localizer. OM is at 5.6 DME. About 9 DME coast said to contact the tower, 124.0. I switched and due to other xmissions, I couldn't check in immediately. I did then hear small aircraft xyz check in at 2000 ft 6.9 DME on the localizer -- my position! We were at 6.9 DME but luckily at 2100 ft. Tower cleared xyz for runway 29L. I had my husband stop descent, then checked in and asked who was at my position. Tower didn't answer but asked xyz to squawk abcd. As I looked back in the 5 O'clock position, I saw an orange and white small aircraft in a hard left turn. I asked tower if we were cleared to continue the approach. He cleared us to land runway 29R. Afterward, in the tower, he said that the other plane was 'for the left.' we had not been warned of any traffic. We were under positive control. We were almost dead.

Original NASA ASRS Text

Title: IFR TRAINING FLT HAS NMAC WITH ACFT APCHING FROM BEHIND.

Narrative: WE WERE ON AN IFR FLT INTO THE LAX BASIN AND DECIDED TO CONTINUE IFR FOR THE APCH INTO TOA. ACFT ARE HELD AT 9000 FT TO CROSS LAX APCH PATH, SO COAST TOOK US S THROUGH TOA LOC THEN BACK TO A 330 DEG HDG AT 3000 FT TO DSND AND CAPTURE THE LOC. OM IS AT 5.6 DME. ABOUT 9 DME COAST SAID TO CONTACT THE TWR, 124.0. I SWITCHED AND DUE TO OTHER XMISSIONS, I COULDN'T CHK IN IMMEDIATELY. I DID THEN HEAR SMA XYZ CHK IN AT 2000 FT 6.9 DME ON THE LOC -- MY POS! WE WERE AT 6.9 DME BUT LUCKILY AT 2100 FT. TWR CLRED XYZ FOR RWY 29L. I HAD MY HUSBAND STOP DSCNT, THEN CHKED IN AND ASKED WHO WAS AT MY POS. TWR DIDN'T ANSWER BUT ASKED XYZ TO SQUAWK ABCD. AS I LOOKED BACK IN THE 5 O'CLOCK POS, I SAW AN ORANGE AND WHITE SMA IN A HARD L TURN. I ASKED TWR IF WE WERE CLRED TO CONTINUE THE APCH. HE CLRED US TO LAND RWY 29R. AFTERWARD, IN THE TWR, HE SAID THAT THE OTHER PLANE WAS 'FOR THE L.' WE HAD NOT BEEN WARNED OF ANY TFC. WE WERE UNDER POSITIVE CTL. WE WERE ALMOST DEAD.

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.