9Manual Number 9018047 • Revision K, July 23, 2021
SECTION 2 PRE-INSTALLATION CONSIDERATIONS
2.1 COOLING
No internal or external cooling of the unit is required. The unit is designed to operate over a wide
temperature range and includes internal thermal monitoring and protection circuits. See Section 4
for more details.
2.2 EQUIPMENT LOCATION
The TB17 Advanced Lithium-ion Battery is designed for mounting flexibility, allowing for installation
with no requirement for temperature or pressure control. Although not required, optimum
performance and life can be achieved by mounting the TB17 in a temperature controlled section of
the aircraft. In addition to altitude and temperature tolerance, the unit is designed to withstand high
levels of condensing humidity. However, installation locations where the unit could be subject to
standing or direct water exposure should be avoided. The unit should be mounted in the upright
position (vent on top).
Failure mode, effects, and criticality analysis of the TB17 has shown that the potential for the
release of toxic or flammable gases as a result of any potential condition is extremely
improbable. However, for additional risk mitigation, the unit is designed with a vent which should
be connected and diverted overboard in the event of such an occurrence. Details for vent
installation are provided in Section 3. The unit should not be installed in compartments where lines,
tanks or equipment containing fuel, oil or other flammable fluids are present. Installation near
potential sources of ignition should be avoided.
Consideration should be given to how the status and reporting functions of the battery will be
displayed within the aircraft. At a minimum, critical parameters determined at the time of
certification should be available to the pilot and/or crew. Additionally, existing aircraft systems
which are designed to work with traditional batteries may need alteration in order to accommodate
the slight change in voltage output of this lithium-ion battery and the communication capabilities
available.
2.3 ROUTING OF CABLES
The power terminal wires associated with the unit are heavy gauge wire and carry significant
power. Be aware of routing cables near other electronics or with other wire bundles that may be
susceptible to high energy flow.
Avoid sharp bends in both the power cables and the signal cabling and be cautious of routing near
aircraft control cables. Also avoid proximity and contact with aircraft structures, avionics
equipment, or other obstructions that could chafe wires during flight and cause undesirable effects.
Cables should not run adjacent to heaters, engine exhausts, or other heat sources. The signal
cable bundle wires are recommended to be no smaller than 24 gauge.
