North Wing S-LSA Maintenance Manual
Model: Scout 912
Version 3.2
Release date 04-16-2014
Page 69
8.
If the AC voltage across the yellow wires is less than 12 volts, there is either a break in
the wires from the alternator to the Hot Box, or the alternator is defective and must be
replaced. To check for a break in the wires, measure the AC voltage on the yellow
wires at the spade connections where they exit the engine and connect to the Hot Box
wires. Be sure to have your meter probe on the wire end from the engine, not the Hot
Box wire end. There could be a poor connection at that joint. If the voltage at that
point is also below 12 volts, then the alternator is defective and must be replaced. In
this case, the regulator is “probably” working properly, but you cannot tell for sure
until the alternator AC voltage is restored.
Replacing the Regulator
1.
Remove the 6 pin connector from the regulator.
2.
Remove the two nuts, top and bottom, attaching the regulator to the Hot Box.
3.
Install new regulator.
4.5.3 Testing and Replacing Magneto Switches
Skill level:
LSR-M, A&P
Tools:
Philips screw driver, Ohm meter or continuity tester
Parts:
Replacement Switches or wire connectors
Task Description:
The North Wing Apache may have one set of mag switches (2 switches) or two sets (four
switches). The second set is optional and would only be used when the aircraft is intended to
be used for instruction. This gives the instructor the ability to easily shut down the engine if it
becomes necessary. The primary set is mounted on the front control panel as shown below
and the second set is mounted on the upper right corner of the seat frame as shown below.
A mag switch works by grounding out the ignition charging coil so that the high voltage spark
CANNOT be generated. If either the ground connection to the switch is broken, or the line
Instructor Mag
Switches (2)
Pilot Mag switches (2)
