Home' RTCA Documents for Review : DO-204B, MOPS Aircraft ELT 406MHZ Contents © EUROCAE, 2018
ADFR power reserve is not sufficient to cover for this period added to the ELT(AD) in
ADFR power reserve after the ditching.
ELT's are self-powered devices that require internal batteries to perform their intended
function. The installation manual must inform the installer of battery type and any
recommended or applicable regulatory installation requirements.
18.104.22.168 ELT Battery Thermal Runaway Containment
If the ELT battery vents, the installation manual must include the location of the vent.
The installation manual must include any warnings, cautions, or limitations associated
with potential battery hazards which could result from mishandling or exceeding
22.214.171.124 ELT Battery Expiration Date Marking
The installation manual must include instructions for legibly marking the expiration
date for replacing (or recharging) the ELT battery on the outside of the transmitter and
entering it into the aircraft maintenance record. The installation manual must state that
this marking should be readily visible or traceable without removing the ELT from its
126.96.36.199 ELT Battery Storage
The installation manual must state that installing the ELT unit in a location subject to
elevated temperatures for prolonged periods of time, (even below the maximum
storage temperature), will reduce the operational life of the battery.
ELT ENVIRONMENTAL CONDITIONS
188.8.131.52 Environmental Qualification
The installation manual must state that the ELT system component be installed in a
location that meets the environmental qualification of the ELT system component.
The installation manual must state that when selecting the ELT, the user must
consider the local environmental conditions in the areas to which the beacon will be
exposed in case of crash.
ELT ANTENNA MOUNTING LOCATION
The installation manual must state that the location of the ELT’s antenna is considered
acceptable if the ELT system meets all applicable specifications of this document.
The installation manual must list the antennas approved for use with the ELT by
COSPAS-SARSAT and/or national regulatory authorities and the maximum cable
attenuation allowed between the ELT and each antenna. It must also state that the
use of alternative antennas requires additional regulatory approval.
184.108.40.206 Externally Mounted Antennas
220.127.116.11.1 Antenna Mounting Location (except for ELT(AD) and (S))
The installation manual must state that the antenna mounting structure be able to
withstand a static load equal to 100 times the antenna weight applied at the antenna
mounting base in all directions which can be demonstrated by either test or
conservative analysis. It must also state that as a general guideline, for high-wing
aircraft, the top of the fuselage and aft of the wing is typically the best location for an
ELT antenna and for low-wing aircraft, placing the antenna near the vertical stabilizer
is typically the best location.
18.104.22.168.2 Antenna Proximity to the ELT
If the ELT is an ELT(AF), ELT(AP) or ELT(DT) type, the installation manual must state
that the ELT and antenna be located as close to each other as practical to reduce the
risk of the antenna cable breaking.
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