<< >> NASA ASRS Report 593934, September 2003

A B727 first officer, on approach to mem, reported that TRACON showed them off course, even though their instruments showed them on course.

Attributes
ACN	593934
Time
Date	200309
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mem.airport
State Reference	TN
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : mem.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 18r
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : mem.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp pilot : private
Experience	flight time last 90 days : 90 flight time total : 5000 flight time type : 2050
ASRS Report	593934
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : clearance non adherence : far non adherence : company policies other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	other other
Supplementary
Problem Areas	Navigational Facility Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

While on approach to ILS runway 18R (mem), controller advised that aircraft was well left off course. Aircraft position was verified by aircraft instruments and showed aircraft was within tolerances, on course. Shortly thereafter, controller advised that aircraft was now well right off course. Again, position was verified and aircraft showed on course. The aircraft on approach behind our aircraft was also given instructions of well left off course and they also verified as being on course. At the termination of the flight, the aircraft was written up in the maintenance log for navigational error check, for the localizer.

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Original NASA ASRS Text

Title: A B727 FO, ON APCH TO MEM, RPTED THAT TRACON SHOWED THEM OFF COURSE, EVEN THOUGH THEIR INSTS SHOWED THEM ON COURSE.

Narrative: WHILE ON APCH TO ILS RWY 18R (MEM), CTLR ADVISED THAT ACFT WAS WELL L OFF COURSE. ACFT POS WAS VERIFIED BY ACFT INSTS AND SHOWED ACFT WAS WITHIN TOLERANCES, ON COURSE. SHORTLY THEREAFTER, CTLR ADVISED THAT ACFT WAS NOW WELL R OFF COURSE. AGAIN, POS WAS VERIFIED AND ACFT SHOWED ON COURSE. THE ACFT ON APCH BEHIND OUR ACFT WAS ALSO GIVEN INSTRUCTIONS OF WELL L OFF COURSE AND THEY ALSO VERIFIED AS BEING ON COURSE. AT THE TERMINATION OF THE FLT, THE ACFT WAS WRITTEN UP IN THE MAINT LOG FOR NAVIGATIONAL ERROR CHK, FOR THE LOC.

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.