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737 MAX Integrated ADIRU (I-ADIRU) and Automatic Navigation Realign (ANR) Mode
GOT-10
Flight Crew Operations Manual Bulletin
for
Gol Linhas Aereas S.A.
Number:
GOT
-
10
IssueDate:
August 20, 2018
Subject:
737 MAX Integrated ADIRU (I-ADIRU) and Automatic Navigation
Realign (ANR) Mode
Reason:
To provide information to the flight crew of the flight deck effects of the
ANR mode.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
The 737 MAX is equipped with I-ADIRU part number HG2050BC04 and it was
revealed during flight test that after landing when the I-ADIRU enters the post-
flight Auto Navigation Realign (ANR) mode it can cause some unexpected flight
deck effects.
The purpose of the ANR mode is to automatically perform an IRS realignment
when the airplane is motionless to remove drift errors associated with position
and ground speed.
The ANR mode is active when the following conditions are met:
• The airplane is on ground
• The IRS Mode Selectors are in NAV mode
• The airplane remains motionless for 7.5 to 15 minutes depending on the
airplane latitude
Information in this bulletin is recommended by The Boeing Company, but may not be FAA approved
at the time of writing. In the event of conflict with the FAA approved Airplane Flight Manual
(AFM), the AFM shall supersede. The Boeing Company regards the information or procedures
described herein as having a direct or indirect bearing on the safe operation of this model airplane.
March 1, 2021
