Nat AA12S Series Compact Audio Controller SM69 Installation And Operation Manual - page 17

SM69 Rev. 4.00 

 AA12S Series Compact Audio Controller Manual 

2.3.5.1 Voltage/Resistance 

Checks 

Check the following: 

a) P101 

pin 

<1> for avionics buss voltage. 

b) P101 

pin 

<16> for continuity to ground. 

c) P101 

pins 

<9> <10> <11> and <12> for continuity to ground when the relevant 

switch is closed.  (Also check pins <13> and <14> if switches are installed in 

these positions.) 

d) P301 

pin 

<5> for avionics lighting bus voltage relative to ground (with lighting on). 

e) P301 

pin 

<17> for continuity to ground. 

2.3.5.2 

Power On Checks 

a) 

Install the AA12S and power up the ship’s systems.  Turn on the radios and 

accessories required for the system. 

b) 

Check for correct radio audio and adjust for acceptable level. 

c) 

Run through all installed functions, and check the ICS and TX functions for all 

users.  Refer to Section 3 for specific operation details. 

Note:  Significantly different headsets may have different mic characteristics. 

d) 

If any preset requires adjustment, be sure this is carried out before the aircraft 

leaves, and that the unit and its mating connector are secured before departure.  

Make all required log book entries, electrical load, weight and balance 

amendments and other paperwork as required by your local regulatory agency. 

2.3.6 Adjustments 

The internal adjustments that can be varied are located along the sides of the unit and 

are accessed through necessary switches and trimpots.  

Note:  The unit is shipped from the factory with all internal adjustments set to the normal 

test levels.  Once installed in the aircraft, it may be desirable to change some of 

these settings to best suit the local operating environment.   

2.3.6.1  

Left Side Adjustments 

MUTE

MUSIC

BASS

ICS

ICS

BAL

R

L

The adjustments found on the left side of the unit are:  

ICS BAL R L, which controls the ICS Balance;  

ICS BASS, which controls the ICS bass level;  

and MUSIC MUTE, which controls the Music mute level. 

Oct 13, 2005 

Page 2-3 

ENG-FORM: 805-0106.DOT 

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.