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[] HEAT PITOT L+C+R
Condition: Left, center and right pitot probe heat is
failed.
Note: The air data is unreliable in icing conditions.
[] HEAT PITOT R
Condition: The right pitot probe heat is failed.
Note: Air data is not affected by a single pitot heat
failure. Ensure that the left AIR DATA/ATT
source switch remains off.
[] ICE DETECTORS
Condition: The ice detectors are failed.
Note: Operate the engine and wing anti–ice
systems manually.
ICING ENG
Condition: Ice is detected and an engine anti-ice
selector is off.
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC
3.12
3.12
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ICING WING
Condition: Ice is detected and one of these occurs:
•The wing anti-ice selector is off
•The wing anti-ice takeoff inhibit is active
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 3.13
3.13
Intentionally
Blank
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC
3.14
3.14
1 Autothrottle disconnect switch . . . . . . . . . . Push
2 Thrust levers (both) . . . . . . . . . . . . . . . . Retard
to mid position
This prevents exceeding thrust limits when
switching to the alternate mode.
4 Thrust levers (both) . . . . . . . Set to maintain the
desired airspeed and
rate of climb or descent
􀀙 Continued on next page 􀀙
TAT Probe Icing
Condition: Icing of the airplane TAT probe or engine TAT
probe is suspected.
Objective: To use the alternate EEC mode calculated
temperature instead of an incorrect TAT.
Push one switch at a time.
3 ENGINE EEC MODE switches (both) . . . . . . .Off
Note: Maximum thrust limiting is not available in
the alternate mode. Alternate thrust setting
information shows on the N1 display.
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 3.15
3.15
5 Choose one:
6 Engine TAT probe icing is suspected:
Airplane TAT display is reliable.
Reference/target N1 and reference N1 displays
are reliable if shown.
Maximum N1 display is reliable if shown.
7 The autothrottle may be re-engaged when both of
the following occur:
The reference/target N1 and reference N1
displays show.
TAT is not near 0 degrees C.
􀀙 Continued on next page 􀀙
􀀙TAT Probe Icing continued􀀙
TAT remains constant and near 0 degrees C:
Airplane TAT probe icing is suspected:
Reference/target N1 and reference
N1 displays may be temporarily
unreliable.
Observe EGT caution limits.
Maximum N1 display may be
temporarily unreliable.
􀁦􀁦Go to step 7
TAT is not near 0 degrees C:
􀁦􀁦Go to step 6
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC
3.16
3.16
8 Do not accomplish the following checklists:
ENG EEC MODE L
ENG EEC MODE R
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[PW Engines, RR Engines]
One or more of the following may be evidence of TAT
probe icing:
•The autothrottle disconnects and the
reference/target EPR and reference EPR displays
blank
•The thrust levers are not aligned with the engine
EPR displays
•The engine EPR displays are not aligned with the
thrust levers aligned
•A decrease or increase in the reference/target EPR
displays at a constant altitude and speed
•The engines are unable to achieve the maximum
continuous or the maximum climb rating with thrust
levers fully forward
•The TAT display remains constant and near 0
degrees C during climb, cruise, or descent
􀀙 Continued on next page 􀀙
􀀙TAT Probe Icing continued􀀙
Additional Information
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 3.17
3.17
[GE Engines]
One or more of the following may be evidence of TAT
probe icing:
•The autothrottle disconnects and the
reference/target N1 and reference N1 displays
　
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