<< >> NASA ASRS Report 396179, March 1998

A B737-200 makes an ILS approach in dfw, tx, only to have failure flags appear on the ILS instruments. Flight crew executes a go around.

Attributes
ACN	396179
Time
Date	199803
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 20000 flight time type : 5000
ASRS Report	396179
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

We were being vectored for an approach to runway 36L at dfw. I had the autoplt on and VOR/localizer selected. Upon intercept the autoplt did not intercept so I took over manually. First officer pointed out that I had flags which I also noticed. ATC gave us headings, then I gave the airplane to copilot who had no flags but then he got flags so by this time I told ATC we were missing the approach and they gave us headings for another approach which was completed successfully without problems except momentary flags but then ok. I called ATC and they told me they had 'no' reported problems with ILS signal. I entered a note in logbook under information only and could not duplicate on the next 2 flts/legs using ILS. P.south. ILS identify was good.

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Original NASA ASRS Text

Title: A B737-200 MAKES AN ILS APCH IN DFW, TX, ONLY TO HAVE FAILURE FLAGS APPEAR ON THE ILS INSTS. FLC EXECUTES A GAR.

Narrative: WE WERE BEING VECTORED FOR AN APCH TO RWY 36L AT DFW. I HAD THE AUTOPLT ON AND VOR/LOC SELECTED. UPON INTERCEPT THE AUTOPLT DID NOT INTERCEPT SO I TOOK OVER MANUALLY. FO POINTED OUT THAT I HAD FLAGS WHICH I ALSO NOTICED. ATC GAVE US HEADINGS, THEN I GAVE THE AIRPLANE TO COPLT WHO HAD NO FLAGS BUT THEN HE GOT FLAGS SO BY THIS TIME I TOLD ATC WE WERE MISSING THE APCH AND THEY GAVE US HEADINGS FOR ANOTHER APCH WHICH WAS COMPLETED SUCCESSFULLY WITHOUT PROBS EXCEPT MOMENTARY FLAGS BUT THEN OK. I CALLED ATC AND THEY TOLD ME THEY HAD 'NO' RPTED PROBS WITH ILS SIGNAL. I ENTERED A NOTE IN LOGBOOK UNDER INFO ONLY AND COULD NOT DUPLICATE ON THE NEXT 2 FLTS/LEGS USING ILS. P.S. ILS IDENT WAS GOOD.

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.