Navigation

Question 1

NAV INERTIAL SYS (amber EICAS message)

Answer 1

Indicates both AHRUs and both IRUs have failed

Question 2

ALTERNATE NAVIGATION

Answer 2

Select NAV on any of the three TCPs

With only standby power, must access with Left TCP

Backup navigation information is displayed on the TCPs and ISFD

With alternate navigation in use, LNAV & VNAV are not available

A/P and A/Ts may be available

There is no database with alternate navigation. A single waypoint must be entered manually in a LAT/LON format

Two nav pages, ALTN NAV and ALTN NAV RADIO

Question 3

TCP ALTN NAV (amber EICAS message)

Answer 3

Displays when ALTN NAV RADIO pages is ON and an ILS or GLS freq and course are entered (uses left ILS receiver ). Data is displayed on the ISFD.