曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
displays the active flight plan, including all transitions, in solid green.
When reverting to selected modes (HDG or TRK), the entry transition to the active leg is no longer
computed, and the active flight plan displays a dotted green line that connects the FROM and TO
waypoints.
When flying a leg transition, if the flight crew reverts from NAV to HDG and then re-engages NAV,
the aircraft attempts to capture the active leg that is currently displayed on the ND (a direct, straight
line), regardless of the transition initially computed.
The flight crew must then adjust the aircraft trajectory in a selected mode before re-engaging NAV,
or perform a DIR TO, if applicable, in order to return to a correct guidance on the expected flight plan
that appears on the ND.
Specific examples are provided below:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
AUTO FLIGHT - FMS SPECIFICITIES
A318/A319/A320/A321 FLEET PRO-SUP-22-20-18 P 2/6
FCOM 19 AUG 10
DIRECT TO
When flying a “Direct to Fix” (DF) leg, including a manual DIR TO, if the flight crew reverts to HDG
or TRK mode, a straight line that connects the start and end points of the DF leg appears, instead
of the initial DF leg.
ND display ‐ before reversion to HDG/TRK:
‐ ND display after reversion to HDG/TRK:
PROCEDURE
To resume managed navigation to the TO waypoint, the flight crew should perform another
DIR TO to this waypoint.
TRANSITION FROM AN “ALTITUDE-TERMINATED” (XA) LEG TO A “DIRECT TO FIX” (DF)
LEG
The following may occur when flying a Missed Approach procedure or a SID in the following
conditions:
‐ A “Direct to Fix” (DF) leg follows an “altitude-terminated” (xA) leg,
‐ The transition between the two legs includes a specified turn direction,
When sequencing the ending altitude of the xA leg (5 800 ft) in a selected mode, the direct leg
transition is no longer computed, and a straight line that connects the start and end points (5 800 ft
and ABQ) appears:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
AUTO FLIGHT - FMS SPECIFICITIES
A318/A319/A320/A321 FLEET PRO-SUP-22-20-18 P 3/6
FCOM 19 AUG 10
If the flight crew then pushes the HDG/TRK selector knob to re-engage NAV mode, while still in
capture conditions, the system computes the shortest possible turn that may be opposite from the
specified turn direction.
PROCEDURE
In order to return to the initial managed path, the flight crew must:
SELECT HDG or TRK to initiate the turn in the desired direction
PERFORM a DIR TO.
(In the above example, the flight crew should initiate a turn to the right, then perform a DIR TO
ABQ).
CONCLUSION AND OPERATIONAL RECOMMENDATION
Before engaging NAV mode by pushing the HDG/TRK selector knob on the FCU, the flight crew
should:
CHECK the active leg displayed on the NDs
If necessary, ADJUST the current HDG or TRK to the desired direction, or
PERFORM a DIR TO to the current TO WPT, when appropriate.
ERRONEOUS TEMPERATURE MODEL USED BY THE
FMS TO COMPUTE PREDICTIONS AND CEILINGS
Applicable to:
The following diagram illustrates the temperature variations in the standard atmosphere:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
AUTO FLIGHT - FMS SPECIFICITIES
A318/A319/A320/A321 FLEET PRO-SUP-22-20-18 P 4/6
FCOM 19 AUG 10
Due to an internal software error, when the real tropopause value is different from the standard value
(proposed as a default value by the FMS on the INIT page of the MCDU), the FMS computes an
erroneous delta ISA.
As a result, several parameters computed by the FMS such as the recommended maximum flight
level (REC MAX FL), for all engine or engine-out conditions, the ECON CRZ Mach number, or the
Estimated Time of Arrival (ETA), may be incorrect. The computation of the Estimated Fuel On Board
(EFOB) is not affected.
The magnitude of the errors may increase when the flight crew overrides the “default” tropopause
value by a manual entry.
Errors in ECON CRZ Mach and ETA will be minimized by an entry of SAT at or close to the flown
CRZ FL.
EXAMPLES
As an example, for an A320-214 aircraft, with the following conditions:
GW = 65 t
CRZ FL = FL 380
Current SAT = – 44 °C entered by the flight crew for the flown FL 380
Actual Tropopause = 42 500 ft
If the flight crew modifies the FMS default tropopause on MCDU and enters 42 500 ft, due to
the FMS anomaly, the REC MAX ALT computed by the FMS (all engines) is REC MAX ALT =
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(66)
