An air carrier B757 flight crew experiences a map shift that was apparently caused when the IRS system were not allowed to update themselves due to flight crew misop of the navigation radios.

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Attributes
ACN	401142
Time
Date	199804
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lax
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	401142
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance non adherence : far other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the PDZ2 arrival in the vicinity of the arnes intersection we experienced a map shift on the first officer's FMC. Captain was in expanded ILS and the first officer was in automatic mode. First officer switched to manual mode and deviation to assigned clearance occurred. Called dispatch desk immediately after arrival and told dispatcher of the above. Captain was tuned to lax runway 25L localizer. No reference on the first officer's receiver at time of shift.

Original NASA ASRS Text

Title: AN ACR B757 FLC EXPERIENCES A MAP SHIFT THAT WAS APPARENTLY CAUSED WHEN THE IRS SYS WERE NOT ALLOWED TO UPDATE THEMSELVES DUE TO FLC MISOP OF THE NAV RADIOS.

Narrative: ON THE PDZ2 ARR IN THE VICINITY OF THE ARNES INTXN WE EXPERIENCED A MAP SHIFT ON THE FO'S FMC. CAPT WAS IN EXPANDED ILS AND THE FO WAS IN AUTO MODE. FO SWITCHED TO MANUAL MODE AND DEV TO ASSIGNED CLRNC OCCURRED. CALLED DISPATCH DESK IMMEDIATELY AFTER ARR AND TOLD DISPATCHER OF THE ABOVE. CAPT WAS TUNED TO LAX RWY 25L LOC. NO REF ON THE FO'S RECEIVER AT TIME OF SHIFT.

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.