FMC Position Update (FMC POS UPDATE)
Displayed automatically on the ground when preflight complete and a departure
runway is entered into the active route.
Selection illuminates the EXEC key and displays the CANCEL UPDATE prompt.

Execution updates the computed FMC position to the threshold of the departure
runway.

CANCEL UPDATE
Displayed after line selection of the FMC POS UPDATE prompt.
Selection clears the prompt, cancels the position update armed condition, and
extinguishes the execute key light.

Takeoff Shift (TO SHIFT)
Automatically displays the departure runway from the RTE page.
If a takeoff shift distance is not entered, the FMC updates to the runway threshold
when TO/GA is pushed.

If a takeoff shift distance is entered, the FMC updates to the threshold of the
departure runway plus the entered displacement when the TO/GA switch is
pushed.

Following TO/GA activation, the runway identifier and any entered shift value are
highlighted in reverse video characters.
To remove a TO SHIFT entry, reselect RWY on RTE page.

Flight Management, Navigation -FMC Preflight 737 Operations Manual

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Copyright . The Boeing Company. See title page for details.
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Flight Management, Navigation -FMC Preflight
Takeoff Page 2
Takeoff Reference Page 2/2 (U4 and on)

Selected Temperature (SEL TEMP)
Repeats data shown on TAKEOFF REF page 1.
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)
Repeats data shown on TAKEOFF REF page 1.
Displays the FMC computed N1 for takeoff.
Crew entry not allowed.
Data line title displays full rated thrust or selected takeoff derate thrust. Typical

line titles display as (U4 and U5) “TO N1” (U7) “22K N1” or “20K N1”.

Flight Management, Navigation -FMC Preflight

737 Operations Manual
Data line title changes to (U4 and U5) “RED TO N1” or (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 effect on thrust will be additive.The Reference N1 bugs will still display full rated or selected takeoff derate thrust N1 values.
It is possible for CLB2 thrust to be greater than the selected reduced takeoff thrust. Therefore, the thrust levers may advance when the thrust limit changes to CLB 2.

Takeoff 1 Derate (XX.XK DERATE/TO–1 DERATE)
Selects the first level of takeoff derate. For example, a 22K engine will derate to
20K.
Selection of derate replaces DERATE in the title with <SEL>.
The reference N1 bugs will display the derated N1 values.
Deletion returns takeoff thrust to full rated value for the installed engines.
Header and data fields blank if no derate capability exists.

Takeoff 2 Derate (XX.XK DERATE/TO–2 DERATE)
Selects the second level of takeoff derate provided one exists.
Selection of derate replaces DERATE in the title with <SEL>.
The reference N1 bugs will display the derated N1 values.
Deletion returns takeoff thrust to full rated value for the installed engines.
Header and data fields blank if no derate capability exists.

INDEX
Push – displays the INIT/REF INDEX page.
Copyright . The Boeing Company. See title page for details.
11.40.42  December 1, 2000

Flight Management, Navigation -FMC Preflight 737 Operations Manual

Selected Temperature (SEL)
Repeats data shown on the preflight version of the N1 LIMIT page.
Entry of an assumed temperature calculates a reduced thrust takeoff N1.
Entry can be made in degrees C or degrees F.

Outside Air Temperature (OAT)
Aspirated TAT displays the sensed OAT in small–size characters. Manual entry of
actual takeoff OAT is displayed in large–sized characters.

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.

INDEX
Push – displays the INIT/REF INDEX page.

Takeoff N1 (XXK N1)
Displays the FMC computed N1 for takeoff.
Crew entry not allowed.

Flight Management, Navigation -FMC Preflight

737 Operations Manual
Data line title displays full rated thrust or selected takeoff derate thrust. Typical
　
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