A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(172)

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THE FLIGHT PATH VECTOR
Applicable to: ALL
When TRK/FPA is selected on the FCU, the "bird" (the FPV) is the flight reference with the TRK and FPA as basic guidance parameters.
In dynamic manoeuvres, the "bird" is directly affected by the aircraft inertia and has a delayed reaction. As a result, the "bird" should not be used as a flight reference in dynamic manoeuvres.
The "bird" is the flying reference that should be used when flying a stabilized segment of trajectory, e.g. a non Precision Approach or visual circuit.
INFORMATION PRESENTATION
The FPV appears on the PFD as a symbol, known as "the bird". The bird indicates the track and flight path angle in relation to the ground.
The track is indicated on the PFD by a green diamond on the compass, in addition to the lateral movement of the bird in relation to the fixed aircraft symbol. On the ND, the track is indicated by a green diamond on the compass scale. The difference in angle between track and heading indicates the drift.
The flight path angle is indicated on the PFD by the vertical movement of the bird in relation to the pitch scale.
 

  SUPPLEMENTARY INFORMATION
FLYING REFERENCE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

use of FPV
 
With the flight directors (FDs) selected ON, the Flight Path Director (FPD) replaces the HDG-VS Flight Director (FD). With both FDs pb set to off, the blue track index appears on the PFD horizon.
PRACTICAL USES OF THE FPV
As a general rule, when using the bird, the pilot should first change attitude, and then check the result with reference to the bird.
NON-PRECISION APPROACH
The FPV is particularly useful for non-precision approaches. The pilot can select values for the inbound track and final descent path angle on the FCU. Once established inbound, only minor corrections should be required to maintain an accurate approach path. The pilot can monitor the tracking and descent flight path, with reference to the track indicator and the bird.
However, pilots should understand that the bird only indicates a flight path angle and track, and does not provide guidance to a ground-based radio facility. Therefore, even if the bird indicates that the aircraft is flying with the correct flight path angle and track, this does not necessarily mean that the aircraft is on the correct final approach path.
VISUAL CIRCUITS
The FPV can be used as a cross-reference, when flying visual circuits. On the downwind leg, the pilot should position the wings of the bird on the horizon, in order to maintain level flight. The
downwind track should be set on the FCU. The pilot should position the tail of the bird on the blue track index on the PFD , in order to maintain the desired track downwind.
 

  SUPPLEMENTARY INFORMATION
FLYING REFERENCE
A318/A319/A320/A321
　
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