While conducting triple approachs into dfw airport, the runway 35C final monitor frequency failed.

Attributes
ACN	546956
Time
Date	200205
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 6000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	landing : go around
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 19 controller time certified in position1 : 6 controller time certified in position2 : 3
ASRS Report	546956
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 30
ASRS Report	546694
Events
Anomaly	other anomaly other
Independent Detector	atc equipment other atc equipment : radio other controllera other controllerb other other : 3-4
Resolutory Action	controller : separated traffic
Supplementary
Problem Areas	Maintenance Human Performance Navigational Facility
Primary Problem	Navigational Facility

Narrative:

Triple simultaneous ILS approachs were in progress. Tower local for center runway had an rdvs failure and transitioned to emergency jacks. Final monitor thus lost their monitor/override capability which is required for simultaneous ILS approachs. Aircraft were already established on all 3 finals and on tower frequencys. I am not sure if separation standards were met between all aircraft -- several aircraft were broken out and brought back around and we then transitioned to 2-RWY operation which could be monitored.

Original NASA ASRS Text

Title: WHILE CONDUCTING TRIPLE APCHS INTO DFW ARPT, THE RWY 35C FINAL MONITOR FREQ FAILED.

Narrative: TRIPLE SIMULTANEOUS ILS APCHS WERE IN PROGRESS. TWR LCL FOR CTR RWY HAD AN RDVS FAILURE AND TRANSITIONED TO EMER JACKS. FINAL MONITOR THUS LOST THEIR MONITOR/OVERRIDE CAPABILITY WHICH IS REQUIRED FOR SIMULTANEOUS ILS APCHS. ACFT WERE ALREADY ESTABLISHED ON ALL 3 FINALS AND ON TWR FREQS. I AM NOT SURE IF SEPARATION STANDARDS WERE MET BTWN ALL ACFT -- SEVERAL ACFT WERE BROKEN OUT AND BROUGHT BACK AROUND AND WE THEN TRANSITIONED TO 2-RWY OP WHICH COULD BE MONITORED.

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.