L3 Technologies AFIRS228S User Manual
AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014
L-3 Aviation Recorders Proprietary
Page 32
165E5733-00 Rev. 03
4. INSTALLATION CONSIDERATIONS
4.1 Satellite Data Unit (SDU)
The SDU is housed in an ARINC 600 2MCU enclosure designed to be mounted in a standard ARINC
600 mounting tray. Although the SDU does not require forced-air cooling, every attempt should be
made to install it in a well-ventilated area, preferably on a mounting tray that provides cooling air to
the SDU.
600 mounting tray. Although the SDU does not require forced-air cooling, every attempt should be
made to install it in a well-ventilated area, preferably on a mounting tray that provides cooling air to
the SDU.
Figure 4-1 – Typical 2MCU Mounting Tray for the SDU
The SDU tray should be electrically bonded to the airframe (<20 milli-ohms), and installed so that
there is easy access to the front panel to facilitate replacing the flash card or connecting to the
Maintenance Port.
there is easy access to the front panel to facilitate replacing the flash card or connecting to the
Maintenance Port.
4.2 SDU Configuration Module (SCM)
The SCM can be mounted on or near the SDU tray within 24 inches of the SDU rear connector. The
SCM should be electrically bonded to the airframe (<20 milli-ohms). Ensure that the installation
location allows easy access to the cover should the SIM card require replacement. Refer to Figure 3-6
for the SCM mounting footprint.
SCM should be electrically bonded to the airframe (<20 milli-ohms). Ensure that the installation
location allows easy access to the cover should the SIM card require replacement. Refer to Figure 3-6
for the SCM mounting footprint.