User Manual

maintenance 523-0 809018
4.3. CONVERSION FROM TTR/TDR TO TSS SYSTEM.
The Traffic Surveillance System (TSS) is d esigned to take the place of on e TDR-94D and a TTR-920, TTR-921, or TCAS-400 0, in
an integrated system.
4.3.1. P
reparation for Conversion.
A list of requirements follows:
• The TSS-4100 requires a 7.5 Amp breaker and 28 V input power.
• The TSS-4100 requires concentrated input busses. If the existing system has a TDR-94D strapped to Configuration 2, this is
already available. If the TDR-94D is s trapped to any other configuration more changes will be necessary to the architecture of
the aircraft to accommodate the TSS-4100.
• The TSS-4100 requires radio altitude on the concentrated input bus for the TCAS function. This may require a change to the
input/output concentrator routing i n o rder to rout e this data to the TSS-4100. This is already true for most Configuration 2 TDR-
94D installations.
• The TSS-4100 requires the following interfaces from the TDR it is replacing: Concentrated bus inputs, Control bus inputs, C on-
trol bus control discretes, All GPS inputs, X -side transponder standby input and output discretes, TDR No. 1 output bus (used
for TSS No. 1 output bus), and Air/Gnd input.
• The TSS-4100 requires the following interfaces from the TTR it is replacing: TA/RA output busses, RA Display and TA Display
input discretes, XT and TX busses to stand alone transponder, 600  output, (Climb Inhibit, Increase Climb Inhibit, Perf Limit,
and Advisory Inhibit) discrete inputs), and Visual Annunciation and Aural Annunciation output discretes.
• The TSS-4100 requires ARINC 615-3/4 data load capability. This is required to load aircraft configuration data.
• The TSS-4100 requires a couple of changes to the maintenance system. The maintenance labels being sent through the TSS No.
1 output bus are different. In addition there must be an option to show the TSS-4100 electronic nameplate.
• A change to the input/output concentrato r tables to route the maintenance and electronic nameplate labels to the maintenance
system is necessary.
• The TSA-4100 replaces the TRE-920 directional antenna. The connectors for the TSA-4100 are rotated 45 degrees from the
placement of the connectors for the TRE-920. This is not an issue if there is only one hole in the skin of the aircraft for all of the
connectors to go through.
4.3.2. D
ifferences between TTR/TDR and TSS.
Differences between the TTR/TDR and TSS systems f ollows:
• It i s recommended that the TD R is on the left and the TSS-4100 is on the right. This is because a transponder is required to be on
the emergency battery bus. Typically, the l eft transponder is on this bus. A s tand alone TDR uses less pow er t han the TSS-4100.
• The TSS-4100 only s upports A429 input busses. CSDB inputs, Gillham altitude, and analog inputs (for example, an analog radio
altitude input) are not supported.
• The TSS-4100 does not support an 8  audio output.
• The TSS-4100 supports a Time Mark input from both GPS sources. The TDR only supports an input from one GPS.
• Aircraft configuration data i s maintained electronically in a file loaded through the TSS-4100 into an attached ECU. In a
TDR/TTR, this aircraft configuration data is maintained through hard straps on the back of the unit.
• The Mode S address for the TSS-4100 is maintained electronically wi thin the attached ECU. TDR has 24 discrete inputs to set
theModeSAddress.
• The TSS-4100 requires cooling. It is highly recommended that the TSM is used as the fan. This mount can be monitored by the
TSS-4100.
NOTE
The TSS-4100 (hardware only) and TSSA-4100 (software only) are separate top level part numbers. Both must
be maintained as part numbers on the aircraft.
The TDR and TTR top level part numbers are different. Each includes both software, and hardware, components.
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