737 MAX Flight Crew Operations Manual
Warning Systems -
System Description
MN-FLT-OH-201
15.20.31
• 40 feet – FORTY
• 30 feet – THIRTY
• 20 feet – TWENTY
• 10 feet – TEN.
Smart 500 Radio Altitude Callout
1B785, 1B786, 1J585 - 1J594
(as installed)
The Smart 500 Callout annunciates FIVE HUNDRED only when an approach has
not been selected in the FMC or if there is an excessive flight path deviation,
regardless of which type of approach is being flown. Activation of this callout is
dependent on the lack of a glideslope or glidepath. Selecting any type of approach
in the FMC will generate a glidepath and the Smart 500 callout is inhibited. The
exception is if there is an excessive flight path deviation, the GPWS will provide
the Smart 500 callout. With the exception of the 500 foot radio altitude callout, this
feature functions with or without any of the normal altitude callouts.
When descending below 500 feet radio altitude on approach, a FIVE HUNDRED
callout is given if:
• an approach is not selected in the FMC, or
• Glideslope Cancel is selected, or
• the flight path is not /- 2 dots of a valid localizer beam or final
approach course (excessive ILS, GLS or FMC flightpath deviation), or
• the flight path is not /- 2 dots of a valid glideslope or glidepath
(excessive ILS, GLS or FMC glidepath deviation)
October 26, 2021
