Limitations - Flight Management, Navigation+

Question 1

Updated 6-3-20
Air Data Inertial Reference Unit (ADIRU)

ADIRU (Air Data Inertial Reference Unit) alignment must not be attempted @ latitudes greater than ? = __degrees __minutes?

Answer 1

78 degrees 15 minutes

Question 2

Updated 6-3-20
All flt. ops. based on mag. hdg. or mag. track angle are prohibited in geographic areas where the installed IRS Mag. Variation table errors are >than ______ degrees?

Answer 2

5 degrees

Note: No AA B737 flts. operate in these prohibited areas.

Question 3

Updated 6-3-20
Global Positioning System (GPS)

When must GPS updating be disabled for approach operation when operating outside the U.S. Natl. Airspace ?

Answer 3

• > if the FMC database and charts are not referenced to WGS-84 ref. datum, unless other appropriate procedures are used.
• > Note: This lim. applies to ops. to China & Russia. All B737 ops. are ref. to WGS-84 datum