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information is identical to the filed ICAO flight plan. This information may be provided
from:
• A flight management system; or
• A pilot control panel; or
• For aircraft, which always operate with the same flight identification (e.g. using
registration as the flight identification) it may be programmed into equipment at
installation.
8.6.2 In case no ICAO flight plan is filed, the Aircraft Registration needs to be
provided to the ADS-B transmit system.
8.7 Special Position Identification (SPI)
For ATC transponder-based ADS-B transmit systems, the SPI capability needs to be
provided. The SPI capability should be integrated into the transponder functionality and
should be controlled from the transponder control panel.
8.8 Emergency Status/Emergency Indicator
8.8.1 When an emergency status (i.e. discrete emergency code) has been selected by
the flight crew, the emergency indicator needs to be set by the ADS-B transmit system.
8.8.2 For ATC transponder-based ADS-B transmit systems, the discrete emergency
code declaration capability should be integrated into the transponder functionality and
should be controlled from the transponder control panel.
Permissible deviation for initial implementations:
For initial implementations, instead of the required transmission of the discrete
emergency codes 7500, 7600 and 7700 when selected by the flight crew, the
transmission of only the generic emergency indicator can satisfy this requirement. Such
deviation from the above target requirement needs to be listed in the Aircraft Flight
Manual (refer to Section 9.3).
8.9 Airworthiness Considerations regarding Optional Provisions
8.9.1 Ground Velocity (OPTIONAL)
Ground velocity, e.g. from an approved GNSS receiver, in the form of East/West and
North/South Velocity (including a velocity quality indicator) is recommended to be
provided.
8.9.2 Special Position Identification (SPI) (OPTIONAL)
For non-ATC transponder-based ADS-B transmit systems (i.e. installations based on
dedicated ADS-B transmitters), a discrete input or a control panel should be provided to
trigger the SPI indication.
8.9.3 Emergency Status/Emergency Indicator (OPTIONAL)
For non-ATC transponder-based ADS-B transmit systems (i.e. installations based on
dedicated ADS-B transmitters), a discrete input or a control panel should be provided to
indicate the emergency status (discrete emergency code).
8.9.4 Flight Deck Control Capabilities (OPTIONAL)
8.9.4.1 Means should be provided to the flight crew to modify the Aircraft Identification
information when airborne.
8.9.4.2 Means should be provided to the flight crew to disable the ADS-B function on
instruction from ATC without disabling the operation of the ATC transponder function.
9(21)
AMC 20-24 Effective: 02/05/2008
Annex II to ED Decision 2008/004/R of 25/04/2008
Note: It is recommended to implement an independent ADS-B disabling function. For
future ADS B application such flight deck capability may become mandatory. It should be
recalled that disabling the operation of the transponder will disable also the ACAS
function.
8.9.4.3 Means should be provided to the flight crew to disable the transmission of the
barometric altitude.
9 COMPLIANCE WITH THIS AMC
9.1 Airworthiness
9.1.1 When showing compliance with this AMC, the following points should be noted:
a) The applicant will need to submit, to the Agency, a certification plan and a compliance
statement that shows how the criteria of this AMC have been satisfied, together with
evidence resulting from the activities described in the following paragraphs.
b) Compliance with the airworthiness requirements (e.g. CS-25) for intended function
and safety may be demonstrated by equipment qualification, safety analysis of the
interface between the ADS-B equipment and data sources, structural analyses of new
antenna installations, equipment cooling verification, evidence of a human to machine
interface, suitable for ADS-B-NRA.
c) The safety analysis of the interface between the ADS-B transmit system and its data
sources should show no unwanted interaction under normal or fault conditions.
d) The functionality for ADS-B-NRA application may be demonstrated by testing that
verifies nominal system operation, the aircraft derived surveillance data contained in the
ADS-B messages, and the functioning of system monitoring tools/fault detectors (if any).
9.1.2 The functionality for ADS-B-NRA application may be further demonstrated by
ground testing, using ramp test equipment where appropriate, that verifies nominal
system operation, the aircraft derived surveillance data contained in the ADS-B
messages, and the functioning of system monitoring tools/fault detectors (if any).
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