B&C LR3D-14 Technical Manual page 10

LR3D Technical Manual
Rev. IR (5/13/2020)
components, such as circuit breakers and an alternator field switch, which meet certain
specifications. These connections and associated components are vital to proper system
function.
2. Use time-proven components in your installation. Our technical staff has found that a
reliable installation is often made or broken by the associated parts used to install the
LR3D. Here are several specific choices that can help you avoid trouble:
• Select a "toggle-type" rather than a "rocker-type" switch for the alternator field
switch. Our tear-down analysis of the internals of each type has shown that the
mechanical properties and basic materials used in a simple toggle switch will
provide superior service over time. Avoid "split-rocker" switches in particular –
though popular and found on many aircraft, these can be a common source of
reliability woes as they accumulate time in service.
• Select KLIXON or Mechanical Products circuit breakers, both of which are widely-
used in general aviation.
reasonably economical, and will serve you well over time. Avoid combination
"switch-circuit breakers" (another common source of reliability issues).
• Use nylon pre-insulated ring terminals (supplied), and crimp these with the correct
tool. Route wiring along existing harnesses, where they exist, and secure with
nylon wire ties. Ensure that all wiring is tied away from chafe points and clear of
all flight control mechanisms throughout the entire range of control movements.
Use a 5-lb pull test to check crimped connections; verify the terminal is crimped on
the wire, not the insulation.
• Ensure the integrity of your alternator field connector (plug) and associated wiring.
The LR3D connects to the alternator by means of a single wire; an intermittent
connection at the alternator will result in erratic – and unstable – operation.
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These well-constructed, single-purpose devices are
Section B
Installation
Page B - 4