Honeywell International Inc. 9PGTPL-100A User Manual

Page 1003

1 Mar 2006

TPL-100A Processor / Part No. 940-0530-001

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The MILACAS-FR Processor finds malfunctions of TCAS components that degrade or 
prevent possible collision avoidance protection. The APX-100/APX-119 Mode S 
transponder finds malfunctions in the Mode S transponder system that degrade normal 
TCAS functions. In the event of a transponder system failure, the transponder causes the 
transponder FAIL or ATC FAIL indicator on the transponder control unit to light. It also 
communicates the failure status to the MILACAS-FR Processor. A failure of the Mode S 
transponder or system results in the following actions by the MILACAS-FR Processor:

•

Supplies an indication to the flight crew that an abnormal condition exists

•

Causes Mode S transmissions that report own aircraft status to indicate that own 
aircraft has no on-board resolution capability

•

Prevents interrogations by own aircraft TCAS

•

Deactivates the normal TCAS display functions.

NOTE: Refer to the pilot’s guide for specific failure indications that appear on the 

various aircraft displays and indicators.

There are two different methods to start and observe the functional self test of the 
MILACAS-FR system. The first method is started at the transponder control unit. Failures 
are annunciated on the aircraft traffic displays. 

SKE-GEN_DATA
SKE-SYNC_DATA
SKE-SYS

Faulty  external 
LRU or wiring

Perform MILACAS-FR Processor self-test using front 
panel to verify failure and source of fault. Refer to 
paragraph 1.F.

Remove and replace faulty LRU, 
remove and replace circuit breaker or remove and 
replace/repair aircraft wiring.
Refer to TPL-100A CMM 012-0794-001.

Table 1002.   MCD LRU Fault List Display (cont)