User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 6−1
15 Dec 2005
FAULT ISOLATION
1. General
The TCAS 3000 Traffic Alert and Collision Avoidance System has three optional procedures
for fault detection and isolation to the LRU level. The first option uses the aircraft’s CMC or
central fault display system (CFDS) if the aircraft is equipped with an onboard maintenance
system. The second option uses a digital interface between the TCAS Computer Unit and the
display system (EFIS, multifunction display or VSI/TRA flat panel display). The third option
uses the annunciators located on the front panel of the computer unit. The annunciators are
activated by a self−test function within the TCAS Computer Unit. Select the procedural option
for fault isolation from paragraph 3., Procedure, which is applicable to the type of aircraft and
the equipment installed.
2. Equipment and Materials
NOTE: Equivalent alternatives are permitted for equipment in this list.
Digital Multimeter − Fluke Model 29, John Fluke Mfg Co. Inc., Everett, WA
3. Procedure
A. CMC or CFDS
Fault information can be displayed from an onboard maintenance system when the
aircraft is so equipped. Fault data is accessible only when the aircraft is on the ground.
Faults that occur at any time, on the ground or while airborne, are stored in fault memory
and reported to the CMC or CFDS. All displayed information is in the English language
with abbreviated terms used only as necessary. Refer to the appropriate CMC or CFDS
support manual for fault retrieval procedures.
B. TCAS Display System
The TCAS display system can be used to display system status and fail messages in the
cockpit, making it more convenient to use than the computer unit front panel annunciators
for a quick checkout of the TCAS system. In contrast with the computer unit self−test,
which records and stores faults from previous flights, the display system test shows only
current status and failure data.