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Lateral Path Exceedance on Approach Procedures with a Course Reversal
GOT-14
Flight Crew Operations Manual Bulletin
for
Gol Linhas Aereas S.A.
Number:
GOT
-
14
IssueDate:
November 16, 2018
Airplane Effectivity: 737 MAX Airplanes with FMC Software U13
Subject:
Lateral Path Exceedance on Approach Procedures with a Course
Reversal
Reason:
This bulletin informs flight crews of an FMC software U13 anomaly
which generates an LNAV lateral path exceedance when flying an
approach with a course reversal to the inbound leg.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
Boeing and GE have received reports from operators of FMC generated LNAV
lateral path exceedances when flying an approach with a course reversal to the
inbound leg. Some of these approach procedures commence the course reversal
at a specified DME and have a lateral limitation not to exceed XX.X DME. In
certain instances, the FMC created path may result in exceeding the DME
restriction.
This is an original anomaly in FMC U13 for the 737 MAX. This anomaly was
introduced when a design change was made to prevent bypasses or
discontinuities, based on procedure design of large track changes that are not
flyable with high terminal ground speeds.
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
