A320飞机维护手册 AMM AUTO FLIGHT 自动飞行3(78)

 LAT REV Page and Perf APPR Page
 Figure 036

 If condition A is false, current FM processing continues. If not,
 two cases must be considered.
 Assuming that:

 -TKAC is the aircraft present track

 -PHI is the aircraft present inclination

 -TKLOC is the LOC bearing,
 Condition B:
 TKAC + 0.7 * PHI - TKLOC | > 20 deg.
 If condition B is true, that means in most of the cases that the
 difference between LOC bearing and aircraft track is greater than
 20 deg., then the current guidance mode is retained until LOC
 capture is active.
 If not, the A/C captures and holds a selected track until LOC
 capture.
 The difference between the LOC bearing and selected track is then
 equal to 20 deg.
 (Ref. Fig. 037)

 H. Flight Plan Sequencing
 (1) Flight plan display The flight plan is automatically sequenced when a leg switch occurs upon transition from the active leg to the next leg. From a display point of view, the F-PLN pages are automatically slewed when the leg switch occurs with the FROM waypoint at the top of the page. The TO waypoint becomes the FROM. However, a pseudo waypoint or marker (flight plan discontinuity...) may not scroll into the FROM waypoint if it is crossed. Instead, the FROM waypoint remains as it is, and the pseudo waypoint is no longer displayed. (Ref. Fig. 038) The point at which the F-PLN sequences depends on the type of transition :
 -
Type 1 transition : the leg switch occurs when the aircraft crosses the bissector.

 -
Type 2 transition : the leg switch occurs when the aircraft reaches the active leg termination point (altitude - radial - distance to a fix). In case of entry into a HX, leg switch occurs when the aircraft crosses the perpendicular to the active leg at its termination point.

 -
Type 3 transition : the leg switch occurs when the aircraft reaches the active leg termination point.

 ILS Precapture
 Figure 037

 F-PLN Sequencing
 Figure 038

 -
Type 4 transition : the leg switch to a DF leg occurs when the aircraft crosses the perpendicular to the active leg at its termination point. The leg switch from a CI or VI leg occurs when the aircraft reaches the CI or VI termination point where it begins the fix referenced leg capture.

 -
Type 5 transition : the leg switch occurs when the aircraft reaches the active leg termination point.

 (2) Flight plan with a manual holding pattern (HM) (Ref. Fig. 039)
 (a)
 When the hold is not active, it is ignored for predictions:

 -the computed hold speed is displayed on F-PLN page.

 (b)
 When the aircraft is within the deceleration segment:

 -
the hold is still ignored for predictions. However the deceleration to the hold speed and acceleration back to ECON are predicted

 -
the predicted speed at entry is the hold speed in speed auto

 control, or the manual speed target in speed manual control. The IMM EXIT prompt is displayed on the line of the HM.
 (c) The hold is active:
 -predictions assume the aircraft will fly one complete circuit
 -
predicted UTC of exit is displayed at the termination fix

 -
predicted altitude of the A/C at the termination fix is

 displayed adjacent to it. If the pilot selects the prompt IMM EXIT, then IMM EXIT function is activated. If selection is done when aircraft is within deceleration segment, the guidance transitions to the next leg following the holding pattern when the aircraft reaches the deceleration segment termination point. If selection is done when aircraft is within the holding, then the aircraft flies a truncated holding pattern and at the holding fix sequences to the next leg following the holding pattern. (Ref. Fig. 040) In both cases, the prompt IMM EXIT* is replaced by a prompt RESUME HOLD*. (Ref. Fig. 041) This prompt remains displayed until the next leg following the holding pattern becomes active. It allows the pilot to reinsert the holding pattern. If it is selected, the prompt IMM EXIT* reappears.

 Holding Pattern Display on MCDU
 Figure 039

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 Holding Pattern Mechanization IMM EXIT
 Figure 040

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 Holding Pattern Exit - MCDU
 Figure 041