Northern Airborne Technology AA38-5xx - Manual (Page 12)

AA38-5xx, -6xx, -7xx and -8xx Series Local ICS Loop
SM54 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-3
ENG-FORM: 805-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
For AA38-503, AA38-603 and AA38-703, also check the following:
d) P102 pin 1 for +28 Vdc relative to ground.
e) P102 pin 20 for continuity to ground.
f) P102 pins 14, 15, 16 and 17 for continuity to ground when relevant TX PTT line is keyed.
For AA38-703, also check the following:
g) P102 pins 11 and 13 for continuity to ground when relevant ICS VOL switch is activated.
For AA38-802, also check the following:
h) P101 and P102 pins 11 and 13 for continuity to ground when relevant ICS VOL switch is
activated.
2.4.2.2 Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the AA38-5xx, -6xx, -7xx
and -8xx. Refer to Section 3 (Operation) for specific operational details.
a) Check for correct radio and intercom audio and adjust for acceptable level.
b) Run through all installed functions, and check the ICS and TX functions for all users.
c) Check preset adjustments are completed before aircraft departure.
Notes: 1. Significantly different headsets may have different MIC characteristics.
2. The David Clark M 7 MIC is more active than the M 4 or M 1/DC MICs. Mixing
different MICs may aggravate headset imbalance.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments and Connections
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. See Section 2.4 for the specific unit under consideration.
The AA38-5xx/6xx/7xx/8xx can be set for up to four NAT tie line configurations, one Andrea tie line
(AA38-5xx and -6xx) or up to four SuperNAT tie lines (AA38-7xx and AA38-802).
The internal adjustments that can be varied are located along the sides and at the rear of the unit. Refer
to Mechanical Installation drawings AA38/xxx/922-0 in Section 2.6 of this manual, where xxx is the model
number under consideration, ie. AA38/503/922-0.