N1 LIMIT Page - Preflight
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.
YA721, YA722
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11.40.36 September 27, 2004
Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual
YA613 - YA687, YA801 - YK104
Selected Temperature (SEL)
Entry of an assumed temperature calculates a reduced thrust takeoff N1.
Entry can be made in degrees C or degrees F.
Maximum allowable entry is 70 degrees C (158 degrees F). The FMC, however,
will limit the N1 to 25% takeoff reduction.
Outside Air Temperature (OAT) YA721, YA722
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.
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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual
Outside Air Temperature (OAT) YA613 - YA687, YA801 - YK104
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.
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. 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.
Takeoff Derates (TO–1 and TO–2)
Push – selects the associated takeoff thrust limit.
YA613, YA626, YA801 - YA809, YC411 - YD655
Takeoff data uplink may automatically select a thrust derate.
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, and the NO VSPD flag to show on the airspeed indication.
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 “24K N1” or “22K N1”
Copyright . The Boeing Company. See title page for details.
11.40.38 June 1, 2005
Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual
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.
YA613 - YA687, YD651 - YD655 Climb thrust is automatically selected at the thrust reduction point on the TAKEOFF REF page 2.
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).
Deletion results in the selection of CLB thrust.
Manual selection of a climb thrust rating overrides the automatic selection.
YA613, YA626, YA801 - YA809, YC411 - YD655
Takeoff data uplink may automatically select a thrust derate.
TAKEOFF
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