6 ics tie loading, 7 pax mute function, 8 post-installation checks – Northern Airborne Technology AA36-002 User Manual
Page 11
SM42 Rev. 4.00
AA36-ECF Tie Line Manual
2.3.6
ICS Tie Loading
The TIE LOAD switch and LOAD ADJ trimpot are used to match the AA36-ECF with up
to four NAT ICS tie lines.
The TIE LOAD switch is set as follows:
Number of NAT ICS Tie Lines
TIE LOAD Switch Position
1 Tie Line
1
2 Tie Lines
2
3 Tie Lines
3
4 Tie Lines
0
The LOAD ADJ trimpot is used for fine adjustment to match the AA36-ECF to the NAT
ICS Tie Lines.
With the TIE LOAD switch set to the desired setting (see table above), adjust the setting
of the LOAD ADJ trimpot so that injecting a 500 mV signal at the ICS IN input gives a
minimum signal across a 5 kOhm load at the ICS OUT output.
2.3.7
PAX Mute Function
The AA36-ECF can be equipped with an external switch to mute all ICS signals if
desired.
If the AA36-ECF is configured with the PAX Mute Function switch, verify its operation by
ensuring that there is no ICS audio in or out of the AA36-ECF when the switch is
enabled.
2.3.8 Post-Installation
Checks
2.3.8.1 Voltage/Resistance
Checks
Do not attach the AA36-ECF until the following conditions are met.
Check the following:
a)
P101 pin <1> for +28 Vdc relative to ground.
b) P101
pin
<14> for continuity to ground (less than 0.5
Ω
).
c) P101
pin
<4> for continuity to ground (less than 0.5
Ω
) when the external PAX
Mute switch is closed (see section 2.3.7 above).
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
Dec 5, 2003
Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.