737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
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D6-27370-866-EGP 11.42.25
YW273, YW274
(SB Changes YK981 - YQ456)
The thrust limiting criterion for MAX altitude is labeled in the header.
• “- T” when available thrust is the limiting criterion for maximum
altitude.
• “- B” when buffet margin is the limiting criterion for maximum altitude.
YW273, YW274
(SB Changes YK981 - YQ456)
Maximum altitude reflects the altitude for the active or mod flight plan.
Values are advisory only. They are provided for crew reference.
7 Step to Altitude Line (STEP)
This line may be used to enter a possible step climb or descent altitude for crew
evaluation.
The line will be blank when within 100 nm of top of descent or when RTA mode
is active.
8 Top of Descent (TO T/D) Line
Displays time of arrival at and distance to top of descent point.
The data is always displayed when the distance is less than 100 nm. If the distance
is more than 100 nm, the data will be displayed only if a step to altitude has not
been entered.
9 ACTUAL WIND
Displays computed or manually entered true wind for present altitude.
A manual entry has priority. The data line title then changes to EST WIND
(estimated wind).
The displayed value is used as the assumed true wind at the step to altitude for
making wind/altitude trade computations.
September 15, 2016
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