Continued Airworthiness - AEM AA21-400 Installation And Operation Manual

Cabin pa system

Hide thumbs Also See for AA21-400:

Maintenance manual (106 pages)

Table Of Contents

Table of Contents

2.3.6.1

Sweep Rate

The sweep rates for the wail and yelp modes of the siren are adjustable using the appropriately marked

pots. The yelp rate is adjustable from 48 cycles/min to 300 cycles/min, and the wail rate is adjustable from

5 cycles/min to 200 cycles/min. Rotating a pot cw will increase the sweep rate, and ccw will decrease it.

2.3.6.2

Level Adjustments

The sidetone, mic, siren, receive, and internal speaker levels are all adjustable by rotating the appropriate

pots cw to increase the level, and ccw to decrease it. The external speaker level is adjustable by rotating

the appropriate pot cw to decrease the level, and ccw to increase it.

The range adjustments for the potentiometers are given below:

External speaker level:

Internal speaker level:

S/T level:

Mic level:

Receive level:

Siren level:

2.3.6.3

Configuration Jumpers

The configuration options for the AA21-400 can be selected by installing jumpers as shown below:

RX/CD:

EXT SPKR LEVEL :

2.4