Flight Management, Navigation -FMC Preflight 737 Operations Manual
Entry is required to enable use of VNAV mode.
Valid entries are 0 to 200. Entry of 0 causes the ECON speed to be MAX RANGE;
200 results in a minimum time flight.
Entry of a CO ROUTE on RTE page causes any company stored value of cost
index to be automatically displayed. A manual entry has priority.
INDEX
Push – displays the INIT/REF INDEX page.
Trip/Cruise Altitude (TRIP/CRZ ALT)
Trip altitude is automatically computed and displayed whenever entries have been
made for the ORIGIN, DEST, GROSS WT, and COST INDEX. Otherwise, the
field is blank.
Trip altitude is the predicted minimum cost altitude determined by operator
constraints. Provides crew a reference for selecting a planned cruise altitude.
Cruise altitude is required.
Enter the cruise altitude for the route.
Automatically displays this cruise altitude on the CLB, CRZ, and RTE LEGS
pages.
Cruise Wind (CRZ WIND)
Cruise wind entry provides input to optimize FMC calculations.
Enter the forecast cruise wind.
Entry is propagated onto the RTE DATA page.
If no entry is made, the FMC assumes zero wind for preflight predictions.
ISA Deviation (ISA DEV)
ISA deviation entry provides input to optimize FMC calculations.
Entry causes T/C OAT to be computed and displayed.
Enter ISA deviation for top of climb altitude.
If no entry is made, FMC assumes zero deviation.
Top of Climb Outside Air Temperature (T/C OAT)
T/C OAT entry provides input to optimize FMC calculations.
Entry causes ISA DEV to be computed and displayed.
Enter T/C OAT.
Flight Management, Navigation -FMC Preflight 737 Operations Manual
If no entry is made, FMC assumes ISA value.
Transition Altitude (TRANS ALT)
Displays 18,000 feet at FMC power up.
Changes automatically after selecting a departure procedure with a different
transition altitude.
Manual entry has priority.
TAKEOFF
Push – displays the TAKEOFF page.
N1 LIMIT
Push – displays the N1 LIMIT page.
Performance Limits Page (U4 and on)
The performance limits page allows the entry of performance limits affecting RTA and ECON calculations.
TIME ERROR TOLERANCE
Used during RTA calculations to establish a boundary on computed speeds.
Copyright . The Boeing Company. See title page for details.
11.40.28 December 6, 2002
Flight Management, Navigation -FMC Preflight 737 Operations Manual
Valid entry range is from 6 to 30 seconds.
(U10) Valid entry range is from 5 to 30 seconds.
Default value is 15 seconds and is displayed in small font.
(U10) Default value is 30 seconds and is displayed in small font.
Minimum Speed/Maximum Speed (MIN SPD/MAX SPD)
Establishes lower and upper speed limits for each phase of flight.
Default is 210/.40 for lower limit and 340/.820 for upper limit. Displayed in small
font.
Either CAS or Mach can be entered.
Limits both RTA and ECON modes in flight.
INDEX
Push – selects INIT /REF INDEX page.
Required Time of Arrival (RTA)
Push – selects RTA PROGRESS page.
Flight Management, Navigation -FMC Preflight 737 Operations Manual
N1 LIMIT Page (Preflight U10)
This section describes the preflight version of the N1 LIMIT page. See the FMC Takeoff and Climb section for a description of the in-flight version of the N1 LIMIT page.
The N1 LIMIT page is used during preflight to manage takeoff and climb thrust. Temperature data is entered, allowing the FMC to make N1 computations for normal or reduced thrust takeoff. Fixed takeoff and climb thrust derates may be selected.
Selected Temperature (SEL)
Entry of 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.
Copyright . The Boeing Company. See title page for details.
11.40.30 December 1, 2000
Flight Management, Navigation -FMC Preflight
737 Operations Manual
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.
Takeoff Thrust Limit (TO XXK)
Push - selects full rated takeoff thrust limit.
Data line title displays full rated thrust. Typical line titles display as “22K” or
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