Honeywell International Inc. 9PGTPL-100A Manuale Utente
Page 7
1 Mar 2006
34-45-54
MAINTENANCE MANUAL
TPL-100A Processor / Part No. 940-0530-001
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
Hybrid surveillance modifications permit the MILACAS-FR system to do its
surveillance mission without causing an increase in the signal environment.
MILACAS-FR uses hybrid surveillance with the 1090-MHz extended squitter to
minimize the impact on the TCAS signal environment. Currently hybrid surveillance is
not supplied in the MILACAS-FR system for TCAS 1030-MHz surveillance.
surveillance mission without causing an increase in the signal environment.
MILACAS-FR uses hybrid surveillance with the 1090-MHz extended squitter to
minimize the impact on the TCAS signal environment. Currently hybrid surveillance is
not supplied in the MILACAS-FR system for TCAS 1030-MHz surveillance.
(3) Interoperability with ATC Ground Radar and Other TCAS II Systems
In coordination with the Federal Aviation Administration (FAA), the air traffic control
(ATC) ON/OFF function was developed to stop ground controllers from receiving
proximity alarms between formation members within US airspace. When ATC OFF is
selected, MILACAS-FR aircraft do not respond to ground based Mode 3/A, Mode C, or
Mode S (UF4 and UF11) interrogations. The system continues to respond to
airborne-based Mode S interrogations. This gives full TCAS traffic avoidance
functionality.
(ATC) ON/OFF function was developed to stop ground controllers from receiving
proximity alarms between formation members within US airspace. When ATC OFF is
selected, MILACAS-FR aircraft do not respond to ground based Mode 3/A, Mode C, or
Mode S (UF4 and UF11) interrogations. The system continues to respond to
airborne-based Mode S interrogations. This gives full TCAS traffic avoidance
functionality.
When ATC ON is selected, Mode 3/A and Mode C are de-selected independently of
the ATC ON/OFF function. All of these features and functions can be selected by the
aircrew. The functions used are selected at the discretion of the ground controller.
the ATC ON/OFF function. All of these features and functions can be selected by the
aircrew. The functions used are selected at the discretion of the ground controller.
Normally, in formation, all aircraft (except lead), fly with ATC OFF selected. In large
formations (four or more), the trail aircraft can fly with ATC ON selected. This allows
ATC to find the location of the lead and trailing formation aircraft to make sure other
aircraft do not fly through the formation.
formations (four or more), the trail aircraft can fly with ATC ON selected. This allows
ATC to find the location of the lead and trailing formation aircraft to make sure other
aircraft do not fly through the formation.
A MILACAS-FR Processor-equipped aircraft’s answer to ATC ground radar and other
TCAS II systems is a function of the operational mode of the Identification Friend or
Foe (IFF) transponder.
TCAS II systems is a function of the operational mode of the Identification Friend or
Foe (IFF) transponder.
The IFF transponder can stop its replies to ground interrogators while it maintains its
data-link with airborne equipment (ATC OFF mode). Modes 1, 2, 3/A, C, and 4 are
individually disabled. Table 1 shows a summary of the answers by the IFF transponder
to each interrogation format.
data-link with airborne equipment (ATC OFF mode). Modes 1, 2, 3/A, C, and 4 are
individually disabled. Table 1 shows a summary of the answers by the IFF transponder
to each interrogation format.
Table 1. MILACAS-FR ATC Interoperability
Interrogation
Reply
IFF Transponder Mode
Mode / UF
ATC On
ATC Off
1
Replies with Mode 1 identity
Replies with Mode 1 identity
2
Replies with Mode 2 identity
Replies with Mode 2 identity
3/A
Replies with Mode 3/A identity
No Reply
C
Replies with Mode C altitude
No Reply
4
Replies with Mode 4 IFF
Replies with Mode 4 IFF
UF0
Replies with DF0/DF16
Replies with DF0/DF16