Northern Airborne Technology 251 - Manual (Page 18)

Model 251 Passenger Speaker Amplifier
SM251 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 2 Page 2-10
2.5 Adjustments and Connections
Internal screwdriver potentiometer adjustments are accessible, after removal of the Model 251 end plate,
to set various chime or ringer levels heard in the passenger speakers.
Figure 1: Internal Trim Pot Adjustments
2.6 Accessories Required But Not Supplied
Installation kits p/n D09SV-IKC, D25SV-IKC & D37SV-IKC (crimp) are required to complete the
installation. The kits consist of the following:
D09SV-IKC consists of:
Quantity Description NAT Part No.
1 D-min 9 Socket Housing 20-21-009
9 MS Crimp Socket 20-26-901
1 9 Pin JVL Hood/Locklever 20-29-090
ENG-FORM: 805-0120.DOT
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