737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
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Sensed or manually entered OAT is used by the FMC to calculate the takeoff N1
limits.
Entry can be made in degrees C or degrees F.
3 Takeoff Thrust Limit (TO XXK)
Push – selects full rated takeoff thrust limit.
Selection of TO automatically selects CLB thrust.
Data line title displays full rated thrust. For example, typical line titles display as
“24K” or “22K.”
Selection of a new rating after V speeds are selected on the TAKEOFF REF page
causes the V speeds to display in small font, and the NO VSPD flag to show on
the airspeed indication.
4 Takeoff Derates (TO–1 and TO–2)
Push – selects the associated takeoff thrust limit.
Takeoff data uplink may automatically select a thrust derate.
Data line title displays the associated reduced thrust rating. For example, typical
line titles display as “22K DERATE” or “20K DERATE”
Normally, selecting TO–1 automatically arms CLB–1 and selecting TO–2
automatically arms CLB–2.
Note: If a reduced thrust takeoff has been specified, then either CLB–1 or CLB–
2 may be automatically specified if required to avoid a climb N1 value
greater than the specified reduced thrust takeoff N1.
Selection of a new rating after V speeds are selected on the TAKEOFF REF page
causes the V speeds to display in small font, and the NO VSPD flag to show on
the airspeed indication.
5 PERF INIT
Push – displays the PERF INIT page.
6 Takeoff N1 (XXK N1)
Displays the FMC computed N1 for takeoff
Data line title displays full rated thrust or selected takeoff derate thrust. Typical
line titles display as “24K N1” or “22K N1”
Data line title changes to RED XXK N1 when an assumed temperature (SEL
TEMP) entry results in a reduced N1 value. If a SEL TEMP and a DERATE are
both selected the data line title will change to “RED XXK N1,” and the effect on
thrust will be additive.
September 24, 2015
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