737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.43.11
YW273, YW274
(SB Changes YK981 - YQ456)
Changes automatically when entering flight plan data based on the following
criteria if a pilot entered value has not already been entered:
• the FMC will use the transition level from the NDB stored for the STAR
or terminal approach record if the flight plan is active, a STAR or
terminal approach has been selected and the transition level exists for
the STAR.
• if an active flight plan exists and no transition level exists on the STAR
or terminal approach NDB record or a STAR or terminal approach has
not been selected, then the FMC will use the transition level from the
NDB stored for the DESTINATION airport.
• if there is no trans level for the DESTINATION airport in the NDB for
the conditions defined above, then the default transition level will
default to the transition altitude from the NDB stored for the
DESTINATION airport.
• if the transition level is not available from any of the sources
above,ained in a loaded custom performance defaults data base.
Manual entry allowed and takes priority.
Data may be up-linked via ACARS message. The up-linked value will appear in
small font until EXECuted at which time it will be displayed in large font.
2 CABIN RATE
(SB Changes YK981 - YQ456)
Displays the predicted cabin rate of descent required by the flight plan descent
profile.
YW273, YW274
(SB Changes YK981 - YQ456)
Displays the predicted cabin rate of descent required by the active flight plan
descent profile.
3 Descent Wind (ALT – – – – – WIND – – – – DIR/SPD)
Allows entry of altitude and wind direction/speed for up to three forecast wind
values.
Entries may be made in any altitude sequence and will be automatically ordered
by altitude from highest to lowest.
Data may be up-linked via ACARS message. The up-linked value will appear in
small font until EXECuted at which time it will be displayed in large font.
4 Thermal Anti–Ice On/Off (TAI ON/OFF)
Enter the altitudes in flight level or feet at which anti–ice is expected to be turned
on and off.
September 15, 2016
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