<< >> NASA ASRS Report 199657, January 1992

Air carrier large transport track heading deviation while on a training flight at dfw making an IAP ILS approach to runway 35R.

Attributes
ACN	199657
Time
Date	199201
Day	Tue
Local Time Of Day	1201 To 1800
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	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain instruction : trainee
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 5300 flight time type : 4
ASRS Report	199657
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer instruction : instructor oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation

Narrative:

After a rather severe windshear (go around) resulting in a touch and go around, we came back around for another approach. I was training in the left seat with an instructor captain in the right. After tuning all navaids again with no indication of any problems, the autoplt first gave a mode failure then quit all together. Then just after intercepting the localizer on what appeared to be on centerline (according to the FMC) the localizer became erratic along with the GS. We were told we had drifted left towards 35L. Then to compound the problem approach gave us the approach frequency for runway 36 by mistake, further compounding the problem. Once we were switched back, we were given a right heading to return to 35R centerline but still has no reliable lo. Just as we were about to go around again, visual contact was made and an uneventful landing followed. Lesson learned: should have taken go around when autoplt knocked off rather than allowing aircraft to drift off course, due to bad ILS input.

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Original NASA ASRS Text

Title: ACR LGT TRACK HDG DEV WHILE ON A TRAINING FLT AT DFW MAKING AN IAP ILS APCH TO RWY 35R.

Narrative: AFTER A RATHER SEVERE WINDSHEAR (GAR) RESULTING IN A TOUCH AND GAR, WE CAME BACK AROUND FOR ANOTHER APCH. I WAS TRAINING IN THE L SEAT WITH AN INSTRUCTOR CAPT IN THE R. AFTER TUNING ALL NAVAIDS AGAIN WITH NO INDICATION OF ANY PROBLEMS, THE AUTOPLT FIRST GAVE A MODE FAILURE THEN QUIT ALL TOGETHER. THEN JUST AFTER INTERCEPTING THE LOC ON WHAT APPEARED TO BE ON CENTERLINE (ACCORDING TO THE FMC) THE LOC BECAME ERRATIC ALONG WITH THE GS. WE WERE TOLD WE HAD DRIFTED L TOWARDS 35L. THEN TO COMPOUND THE PROBLEM APCH GAVE US THE APCH FREQ FOR RWY 36 BY MISTAKE, FURTHER COMPOUNDING THE PROBLEM. ONCE WE WERE SWITCHED BACK, WE WERE GIVEN A R HDG TO RETURN TO 35R CENTERLINE BUT STILL HAS NO RELIABLE LO. JUST AS WE WERE ABOUT TO GAR AGAIN, VISUAL CONTACT WAS MADE AND AN UNEVENTFUL LNDG FOLLOWED. LESSON LEARNED: SHOULD HAVE TAKEN GAR WHEN AUTOPLT KNOCKED OFF RATHER THAN ALLOWING ACFT TO DRIFT OFF COURSE, DUE TO BAD ILS INPUT.

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.