曝光台 注意防骗
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minimum change in vertical speed.
Depending on each situation, TCAS generates a :
• Preventive Advisory (i.e. the actual vertical speed may be maintained). It displays the vertical
speed range to be avoided.
• Corrective Advisory i.e. the actual vertical speed is within the range to be avoided and a
recommended vertical speed (fly to) range is displayed.
• Modified Corrective Advisory, which changes already displayed RA (i.e if the intruder changes
their vertical speed).
OPERATIONAL RECOMMENDATIONS
Avoidance generalities :
Always follow the RAs orders, even if they lead to cross the altitude of the intruders, as they
ensure the best global separation.
CAUTION If a pilot does not follow a RA, he should be aware that the intruder may be
TCAS equipped and may be maneuvering toward his aircraft in response to a
coordinated RA. This could compromize safe seperation.
Pilots should comply with the vertical speed limitations during the last 2 000 ft of climb or
descent. In particular, pilots should limit vertical speeds to 1 500 ft/min during the last 2 000 ft
of a climb or descent, especially when they are aware of traffic that is converging in altitude
and intending to level off 1 000 ft feet above or below the pilot’s assigned altitude.
Select TA only mode in the following cases :
‐ Engine failure.
‐ Dispatch with landing gear down (if applicable).
A318/A319/A320/A321 FLIGHT CREW
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‐ In case of known nearby traffic, which is in visual contact.
‐ At particular airports, and during particular procedures identified by an Operator as having
a significant potential for unwanted a inappropriate RAs (closely-spaced parallel runways,
converging runways, low terrain along the final approach...)
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APPROACH ON PAPI OR TVASI
Applicable to: ALL
Eye to wheel height on approach is 25 ft and minimum recommended wheel clearance over the
threshold is 20 ft. Do not follow Precision Approach Path Indicator (PAPI) or "T"-Visual Approach
Slope Indicator (TVASI) guidance below 200 ft when PAPI or TVASI Minimum Eye Height over
Threshold (MEHT) is less than 45 ft.
QNH USE FOR TO/APPR/LDG ON QFE/QNH PIN PROGRAMMED AIRCRAFT
Applicable to: ALL
GENERAL
The QNH option is the basic reference on the aircraft.
For Operators using QFE reference, switching from “QNH only” to QNH/QFE can be done by
activating a specific pin program on the three following computers : FMGC, GPWC, FCU. For
various reasons, some Operators may use QNH reference for approach and landing on QNH/QFE
pin programmed aircraft. The flight crew should be aware of the following consequences
and should use the procedures in PRO SUP 34 (Refer to PRO-SUP-34-D QNH USE FOR
TO/APPR/LDG ON QFE/QNH PIN PROGRAMMED AIRCRAFT - PROCEDURES).
Applicable to: ALL
CONSEQUENCES
When the pin program is the QNH/QFE option, the 2R field of the MCDU PERF APPR page is
named “MDH” independently of the baro setting reference selected by the flight crew.
Applicable to:
PROCEDURES
No specific procedures are necessary for takeoff, climb, cruise, descent and go around phases.
PROCEDURE FOR PRECISION APPROACHES (CAT 2 AND CAT 3)
Insert the DH into the DH field of the PERF APPR page as usual.
PROCEDURE FOR ILS APPROACH (CAT 1)
Insert the DA into the MDH field of the PERF APPR page.
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PROCEDURE FOR NON-PRECISION APPROACHES (NPA)
For ‐ NPAs other than LOC and LOC B/C :
• If NAV-FPA or NAV-V/S mode is used, enter an MDA (not an MDH) in the MDH field of the
MCDU. The altitude indication on PFD becomes amber at MDA.
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