INSTALLATION AND OPERATION
MANUAL SUPPLEMENT
NAT Part #: 251-003 Description: Passenger Speaker Amplifier
Document #: SM251\251-003\810-0 Rev: 1.30
Oct 5, 2005 Page 1 of 2
ENG-FORM: 810-0105.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
This supplement contains installation and operation information that is unique to the
251-003 Passenger Speaker Amplifier. Installation and operation information
common to the 251 base unit can be found in SM251 Installation and Operation Manual.
1 Description
1.1 Functional/Cosmetic Changes
The 251-003 is identical to the 251 base model with the following exceptions.
a) Briefing audio is to output through the right speaker only.
b) The receiver inputs and switches are not available.
c) The briefer switch input is externally grounded, disabling the Stereo Left input and
the Stereo Right input.
d) The left stereo speaker gain is approximately doubled.
e) The speaker mute provides an 8 dB drop on the left speaker output.
2 Installation
For general Installation information and drawings, see Installation and Operation
Manual SM251. Select the appropriate revision of the drawing for the serial number of
the unit under consideration. The drawings specific to this derivative are listed below,
and can be found at the end of this supplement.
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General