Selection of a new rating after V speeds are selected on the TAKEOFF REF page
causes the V speeds to display in small font.
Takeoff Derates (TO-1 and TO-2)
Push - selects the associated takeoff thrust limit.
Data line title displays the associated reduced thrust rating. 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.
PERF INIT
Push – displays the PERF INIT page.
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 “22K N1” or “20K 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.The Reference N1 bugs will still display full rated or selected takeoff derate thrust N1 values.
Climb (CLB)
Push - selects full rated climb thrust limit.
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December 1, 2000 11.40.31
Flight Management, Navigation -FMC Preflight 737 Operations Manual
Reduced Climb (CLB-1 and CLB-2)
Push - selects the associated reduced thrust climb mode.
CLB-1 provides a climb limit reduced by 3% N1 (approximately 10% thrust). CLB-2 provides a climb limit reduced by 6% N1 (approximately 20% thrust). Manual selection of a climb thrust rating overrides the automatic selection.
TAKEOFF
Push – displays the TAKEOFF REF page.
Selecting Takeoff Thrust
Selecting the maximum takeoff thrust or a derate displays <ACT> inboard of the option. The FMC automatically selects the highest climb thrust available which would not result in a throttle increase, when the aircraft transitions from takeoff to climb. <SEL> is displayed inboard of the selected climb N1 limit.
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Flight Management, Navigation -FMC Preflight 737 Operations Manual
Takeoff Page 1 Takeoff Reference Page
The takeoff reference page allows the crew to manage takeoff performance. On airplanes with aspirated TAT, temperature data is displayed automatically. On all airplanes temperature data can be entered manually. This allows the FMC to make takeoff N1 computations for normal or reduced thrust takeoff. V speeds are entered and verified. Preflight pages are selectively displayed to indicate preflight status whenever required entries on those pages are incomplete.
Takeoff reference page entries finish the normal preflight. V speeds should be set before completion. FMC position can be updated prior to takeoff.
Flight Management, Navigation -FMC Preflight 737 Operations Manual
Outside Air Temperature (OAT)
Manual entry of actual takeoff OAT is displayed in large–sized characters and is
used by the FMC to calculate the takeoff N1 limits.
Entry can be made in degrees C or degrees F.
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11.40.34 December 1, 2000
Flight Management, Navigation -FMC Preflight 737 Operations Manual
Selected Temperature (SEL TEMP)
Entry of an assumed temperature calculates a reduced thrust takeoff N1.
Entry can be made in degrees C or degrees F.
Takeoff N1 (XX.XK N1/TO N1)
Displays the FMC computed N1 for takeoff.
Crew entry not allowed.
Data line title displays full rated thrust or (U4 and on) selected takeoff derate
thrust. Typical line titles display as (prior to U7) “TO N1” (U7) “22K N1” or “20K
N1”.
(U3) Data line title changes to “RED TO N1” when an assumed temperature (SEL
TEMP) entry results in a reduced N1 value. The Reference N1 bugs will still
display full rated thrust N1 values.
Data line title changes to (U4 and U5) “RED TO N1” (U7) “RED XX.XK 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
(U4 and U5) “RED TO–1” or “RED TO–2” or (U7) “RED XX.XK N1,” and the
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