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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.
SUPPLEMENTARY INFORMATION
FLYING REFERENCE
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.
On the final inbound approach, the track index should be set to the final approach course of the runway. A standard 3 ° approach path is indicated, when the top of the bird's tail is immediately below the horizon, and the bottom of the bird is immediately above the 5 ° nose down marker
Use of FPV in the Final Approach
FINAL APPROACH
The bird is a very useful flight reference, because it provides the trajectory parameters, and
quickly warns the pilot of downburst. In addition, together with the GS MINI protection, it is an excellent indicator of shears or wind variations. The position of the "bird" in relation to the fixed aircraft symbol provides an immediate indication of the wind direction. Therefore, when approaching the minima, the pilot knows in which direction to search for the runway.
If the target approach speed symbol moves upward, this indicates that there is headwind gust. If the bird drifts to the right, this indicates that there is wind from the left.
SUPPLEMENTARY INFORMATION
FLYING REFERENCE
Bird and Target Speed - Wind Interpretation
RELIABILITY
The FPV is computed from IRS data, therefore, it is affected by ADIRS errors. An error may be indicated by a small track error, usually of up to ±2 °. This can be easily determined during the approach.
The FPV is also computed from static pressure information. Therefore, the bird must be considered as not reliable, if altitude information is not reliable.
GO AROUND
Applicable to: ALL
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A330/A340 机组训练手册 FCTM Flight Crew Training Manual 2(64)
