曝光台 注意防骗
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SEL/TRK SEL or HDG HOLD/TRK HOLD for the maneuvering portion of the
circling approach. If circling from an ILS approach, fly the ILS in LOC and
VNAV, V/S, or FPA modes.
Use of the APP mode for descent to a circling approach is not recommended for
several reasons:
• the AFDS does not level off at MCP altitude
• exiting the APP mode requires initiating a go-around or disconnecting the
autopilot and turning off the flight directors.
When in altitude hold at MDA(H) and before commencing the circling maneuver,
set the missed approach altitude.
Before turning base or when initiating the turn to base leg, select landing flaps if
not previously selected and begin decelerating to the approach speed plus wind
correction. To avoid overshooting final approach course, adjust the turn to final to
initially aim at the inside edge of the runway threshold. Timely speed reduction
also reduces turning radius to the runway. Do the Landing checklist. Do not
descend below MDA(H) until intercepting the visual profile to the landing
runway.
Leaving MDA(H), disengage the autopilot. After intercepting the visual profile,
cycle both F/D to OFF, and select the PM F/D to ON. This eliminates unwanted
commands for the PF and allows continued F/D guidance for the PM in the event
of a go-around when pitch or roll mode is changed. Complete the landing.
Note: If a go-around is selected with either flight director switch in the OFF
position, the flight director pitch or roll command bar on the corresponding
side will disappear when the first pitch or roll mode is selected or engaged.
Obstruction Clearance
Obstruction clearance areas during the circling approach are depicted in the
following figure. Distances are determined by airplane approach category. Adjust
airplane heading and timing so that the airplane ground track does not exceed the
obstruction clearance distance from the runway at any time during the circling
approach.
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 5.59
Circling Approach - One Engine Inoperative
If a circling approach is anticipated, maintain gear down, flaps 20 and a minimum
of VREF 20 + wind correction while circling. Do not descend below MDA(H)
until intercepting the visual profile.
If landing with flaps 30, maintain gear down, flaps 20, and flaps 20 maneuvering
speed from the final approach fix until initiating the turn to base. Before turning
base or when initiating the turn to base leg, select flaps 30, reduce speed to VREF
30 + wind correction and intercept the landing profile. Do not descend below
MDA(H) until intercepting the visual profile.
Under some flight conditions such as high temperatures, high pressure altitudes,
and high airplane weight, limit thrust may be required to maintain level flight with
the gear down and flaps 20. When these conditions are encountered consider
retracting the landing gear for the circling portion of the approach after the descent
to MDA(H). The GPWS gear override switch may be used to prevent nuisance
warnings.
Airplane
Category
FAA Obstruction
Clearance Radius (r)
ICAO Obstruction
Clearance Radius (r)
C 1.7 NM 4.2 NM
D 2.3 NM 5.28 NM
r
r
r
r
r
r
r
Radius (r), defining size of
areas, varies with airplane
category.
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
5.60 FCT 777/787 Preliminary (TM)
Missed Approach - Circling
If a missed approach is required at any time while circling, make a climbing turn
in the shortest direction toward the landing runway. This may result in a turn
greater than 180° to intercept the missed approach course. Continue the turn until
established on an intercept heading to the missed approach course corresponding
to the instrument approach procedure just flown. Maintain the missed approach
flap setting until close-in maneuvering is completed.
Different patterns may be required to become established on the prescribed missed
approach course. This depends on airplane position at the time the missed
approach is started. The following figure illustrates the maneuvering that may be
required. This ensures the airplane remains within the circling and missed
approach obstruction clearance areas.
In the event that a missed approach must be accomplished from below the
MDA(H), consideration should be given to selecting a flight path which assures
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787机组训练手册Flight Crew Training Manual 787(88)
