MN-FLT-OH-201
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Elevator Jam Landing Assist Switch
GOT-16
Flight Crew Operations Manual Bulletin
for
Gol Linhas Aereas S.A.
Number:
GOT
-
16
IssueDate:
March 27, 2019
Airplane Effectivity: 737-7 / -8 / -9
Subject:
Elevator Jam Landing Assist Switch
Reason:
To inform flight crews of the possibility that the Elevator Jam Landing
Assist switch installed on some airplanes is a 3 position switch instead
of the correct 2 position switch.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
The Elevator Jam Landing Assist switch on the 737 MAX is supposed to be a
guarded 2 position switch. The 2 positions are ON and OFF with the switch
guard closed to the OFF position. During production testing on a 737-8 airplane,
it was discovered that the Elevator Jam Landing Assist switch installed on some
airplanes has a 3 position switch, an ON position, an OFF position and a middle
position. The middle position is not wired and is therefore equivalent to the OFF
position. Regardless of whether the correct 2 position switch or incorrect 3
position switch is installed, the panel is only labeled for a 2 position switch and
labeled with ON and OFF. When the guard is closed, the switch can only be in
the middle or OFF positions.
Boeing has worked with the switch manufacturer, Honeywell, to identify the
issue. Service Letter 737-27-275 has been released to provide a switch
replacement process.
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
