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Preflight Pages – Part 2B
Thrust Limit Page
The thrust limit page allows selection and display of reference thrust for takeoff.
Derating takeoff thrust by use of assumed temperature is also accomplished on this
page.
1 Assumed Temperature (SEL), Outside Air Temperature (OAT)
Initially blank. Displays entered assumed temperature up to the maximum thrust
reduction limits.
1 5
5
1
< IN DEX >
- -- --- --- -- -- -- --- -- ---
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TH R L M
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C L B >
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1 0
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PERF INIT
THRUST LIM>
TAKEOFF REF
<INDEX
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INIT/REF INDEX
<THRUST LIM
INIT
REF
2
3
4
5
7
10
11
1
8
9
12
6
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.31
Entry of an assumed temperature warmer than OAT reduces takeoff thrust and
displays D as part of thrust mode.
Valid entries are 0 to 99 degrees Celsius (C) or 32 to 210 degrees F.
Entry in degrees Fahrenheit (F) causes OAT to display degrees F.
Uplinked temperatures display on both THRUST LIMand TAKEOFF REF pages.
Entry of a value after takeoff speeds are selected deletes V speeds and displays the
scratchpad message TAKEOFF SPEEDS DELETED.
OAT displays outside air temperature in degrees C. When SEL temperature is in
degrees F, the OAT converts to degreesF.
2 Takeoff (TO)
Push – selects full rated (TO) takeoff thrust limit.
Selection of a new rating after takeoff speeds are selected deletes V speeds and
displays the scratchpad message TAKEOFF SPEEDS DELETED.
3 Takeoff 1 (TO 1)
Push – selects percentage derate (TO 1) takeoff thrust limit.
Takeoff thrust derate can be entered by uplink.
Selecting TO 1 arms CLB 1.
4 Takeoff 2 (TO 2)
Push – selects percentage derate (TO 2) takeoff thrust limit.
Takeoff thrust derate can be entered by uplink.
Selecting TO 2 arms CLB 2.
5 INDEX
Push – displays INIT/REF INDEX page.
6 Thrust Reference Mode
Displays selected takeoff thrust mode.
7 Takeoff N1 Limit
Displays takeoff N1 calculated by the thrust management system.
8 Climb (CLB)
Push – selects the full rated (CLB) climb thrust limit.
Pushing any climb line select key overrides an automatic selection.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.32 D6-30151-425
Flight Management, Navigation -
FMC Preflight
9 Climb 1 (CLB 1)
Push – selects a percentage derate (CLB 1) climb thrust limit.
Climb thrust derate can be entered by uplink.
10 Climb 2 (CLB 2)
Push – selects a percentage derate (CLB 2) climb thrust limit.
Climb thrust derate can be entered by uplink.
11 TAKEOFF
Push – displays TAKEOFF REF page.
12 <SEL>, <ACT>
<SEL> - identifies selected takeoff thrust reference mode.
<ARM> - identifies armed climb thrust reference mode. <ARM> changes to
<SEL> when armed climb mode becomes active.
Takeoff Reference Page 1
Takeoff reference page allows the flight crew to manage takeoff performance.
Takeoff flap setting and V speeds are entered and verified. Thrust limits, takeoff
position, and takeoff gross weight can be verified or changed. Preflight
completion status is annunciated until complete.
Takeoff reference page entries finish the normal preflight. Takeoff flap setting
must be entered and V speeds should be set before completion.
Note: Acceleration/thrust reduction heights are added to runway elevation
causing acceleration/thrust reduction at the desired MSL altitude. For
example, for a runway elevation of 980 feet, an entry of 2020 acceleration
height causes acceleration at 3,000 feet MSL.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.33
1 FLAP/Acceleration Height (ACCEL HT)
Displays takeoff flap setting.
Valid entries are 10 or 20.
Flap position is required for takeoff V speed calculations.
Displays acceleration height for flap retraction.
　
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