<< >> NASA ASRS Report 1268279, May 2015

A B747 captain reported his aircraft's navigation system is unable to comply with navigation standards.

Attributes
ACN	1268279
Time
Date	201505
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	INS / IRS / IRU
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 108 Flight Crew Total 14047 Flight Crew Type 3781
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Track / Heading All Types

Narrative:

Epled intersection: 10 degrees east variation on map and flight plan; IRS steering the plane has 29 degrees east variation - 19 degree navigation display error checking course number to be flown crossing epled.bitte intersection; alaska ADIZ report: 23 degree east variation on map and flight plan; IRS steering the plane has 39 degree east variation--16 degree navigation display error checking course number to be flown crossing bitte.unable to comply with standard world aviation navigation auditing standards; compass has 900 percent more error than design build of a long range class 2 navigation system.

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Original NASA ASRS Text

Title: A B747 Captain reported his aircraft's navigation system is unable to comply with navigation standards.

Narrative: EPLED intersection: 10 degrees east variation on map and flight plan; IRS steering the plane has 29 degrees east variation - 19 degree navigation display error checking course number to be flown crossing EPLED.BITTE intersection; Alaska ADIZ report: 23 degree east variation on map and flight plan; IRS steering the plane has 39 degree east variation--16 degree navigation display error checking course number to be flown crossing BITTE.Unable to comply with standard world aviation navigation auditing standards; compass has 900 percent more error than design build of a long range class 2 navigation system.

Data retrieved from NASA's ASRS site 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.