31-51-00 CENTRAL ANNUNCIATION SYSTEM Back
A. System Function
The central annunciation system (the system) gives an indication to the aircrew that a fault or a failure in a system has occurred. It also gives an indication of the condition of some systems.
B. System Components
The primary components of the systems are the:
C. System Operation
The CAP gets a 28 V dc signal from the appropriate aircraft system. The signal causes the appropriate caption on the CAP to come on and the amber or red attention-getters, on the coaming, to flash. The audible warning also gives a sound. The system operates when the 28 V dc emergency busbar and the 28 V dc essential busbars are energized. The electrical supplies are through circuit breakers.
The central annunciation system (the system) gives an indication to the aircrew that a fault or a failure in a system has occurred. It also gives an indication of the condition of some systems.
B. System Components
The primary components of the systems are the:
- Central Annunciator Panel (CAP) (Ref. Fig. 2)
- Upper-dim/test control box (Ref. Fig. 2)
- Lower-dim/test control box (Ref. Fig. 1)
- Two amber attention-getters (Ref. Fig. 2)
- Two red attention-getters (Ref. Fig. 2)
C. System Operation
The CAP gets a 28 V dc signal from the appropriate aircraft system. The signal causes the appropriate caption on the CAP to come on and the amber or red attention-getters, on the coaming, to flash. The audible warning also gives a sound. The system operates when the 28 V dc emergency busbar and the 28 V dc essential busbars are energized. The electrical supplies are through circuit breakers.
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