Manual Number 9018205 Revision F, April 1, 2021
8
SECTION 2 PRE-INSTALLATION CONSIDERATIONS
2.1 COOLING
The CH93 will become warm when in use; however no external cooling is required. This is normal
and within operational parameters. No special mounting considerations are required, although
mounting to a metal surface can help dissipate any heat generated and extend the life of the
product.
2.2 EQUIPMENT LOCATION
The CH93 Digital Clock / USB Charging Port is designed for a circular rear panel mount
configuration, allowing for installation in a cockpit or cabin. Clearance should be provided for the
input mating connector which may require an additional inch of clearance beyond the rear of the
unit.
2.3 ROUTING OF CABLES
Avoid sharp bends in cabling and routing near aircraft control cables. Avoid close proximity and
contact with aircraft structures, avionics equipment or other obstructions that could chafe wires
during flight and cause undesirable effects.
2.4 LIMITATIONS
Environmental qualifications were verified per RTCA DO-160, Revision G in lieu of those identified
within the minimum performance standards (MPS) of the TSO.
The conditions and tests for TSO approval of this article are minimum performance standards.
Those installing this article, on or in a specific type or class of aircraft, must determine that the
aircraft installation conditions are within the TSO standards, specification of the article and
deviations as listed above. TSO articles must have separate approval for installation in an aircraft.
The article may be installed only according to 14 CFR part 43 or the applicable airworthiness
requirements.
Note: Per 8300.16 job aid applicable to airplanes certified under Title 14 of the Code of Federal
Regulations part 25 (Section H. Alterations or Repairs, Element H.7). (
Approval is required for
)
Changes to designs involving lithium batteries or battery systems
except
for the following cases:
1. Very small batteries or battery systems (e.g., button/coin cells) not required for safe
operation of the airplane that have less than 2 watt-hours of energy and meet UL
1642,UL 2054 or International Electrotechnical Commission(IEC) 62133.
The battery in the CH93 is non-rechargeable and considered “very small”. It is less than two Watt-
hours and is certified to UL 1642. No STC or coordination with the ACO is required.
