VFR C172 on approach to myf experienced conflict with C172 also on final to the same runway; ATC reportedly confused regarding identification of aircraft involved.

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Attributes
ACN	726674
Time
Date	200702
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : myf.airport
State Reference	CA
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : myf.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 28r
Flight Phase	descent : approach
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : myf.tower
Make Model Name	Skyhawk 172/Cutlass 172
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Person 1
Affiliation	other
Function	instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 16 flight time total : 235 flight time type : 235
ASRS Report	726674
Person 2
Affiliation	other
Function	instruction : instructor
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 700 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

I was on an IFR training flight; on the ILS runway 28R; myf. Cfii in right seat; I had hood on. Myf tower kept giving us misleading and confusing directions -- stating we were south of course when we had the localizer centered. This continued as we proceeded inbound. At about 1 mi from the runway threshold the cfii spotted another C172 above; ahead; and to our right that had apparently overtaken us. Cfii informed the tower that they had 2 aircraft on final to runway 28R. Tower apparently realized their mistake; told us to climb and proceed west; which I did. Tower stated that our 'tag' was 'floating' on the scope. (We had been assigned a discrete code by socal approach.) apparently as a result tower was giving instruction to us that should have been for another aircraft. As a result potentially they could have issued evasive actions that would have led to decreasing separation.

Original NASA ASRS Text

Title: VFR C172 ON APCH TO MYF EXPERIENCED CONFLICT WITH C172 ALSO ON FINAL TO THE SAME RWY; ATC REPORTEDLY CONFUSED REGARDING ID OF ACFT INVOLVED.

Narrative: I WAS ON AN IFR TRAINING FLT; ON THE ILS RWY 28R; MYF. CFII IN R SEAT; I HAD HOOD ON. MYF TWR KEPT GIVING US MISLEADING AND CONFUSING DIRECTIONS -- STATING WE WERE S OF COURSE WHEN WE HAD THE LOC CTRED. THIS CONTINUED AS WE PROCEEDED INBOUND. AT ABOUT 1 MI FROM THE RWY THRESHOLD THE CFII SPOTTED ANOTHER C172 ABOVE; AHEAD; AND TO OUR R THAT HAD APPARENTLY OVERTAKEN US. CFII INFORMED THE TWR THAT THEY HAD 2 ACFT ON FINAL TO RWY 28R. TWR APPARENTLY REALIZED THEIR MISTAKE; TOLD US TO CLB AND PROCEED W; WHICH I DID. TWR STATED THAT OUR 'TAG' WAS 'FLOATING' ON THE SCOPE. (WE HAD BEEN ASSIGNED A DISCRETE CODE BY SOCAL APCH.) APPARENTLY AS A RESULT TWR WAS GIVING INSTRUCTION TO US THAT SHOULD HAVE BEEN FOR ANOTHER ACFT. AS A RESULT POTENTIALLY THEY COULD HAVE ISSUED EVASIVE ACTIONS THAT WOULD HAVE LED TO DECREASING SEPARATION.

Data retrieved from NASA's ASRS site as of January 2009 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.