Narco Avionics MK 12D PLUS TSO NAV/COM Addendum Installation Manual - page 8
NARCO AVIONICS MK12D+
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2.6
MECHANICAL INSTALLATION
This Section provides the mechanical installation steps for mounting the tray and rear connector.
2.6.1
Tray Lock
The tray has a built-in spring locking device. When the Unit is positioned into the tray's track and slid
into the tray the tension (lock) spring contacts the Unit. When the Unit's connectors touch the tray
connectors an additional set of tension springs can be felt holding back the inward direction of the Unit.
At this point using firm pressure the Unit will continue inward approximately a half-inch stopping as the
forward tension/locking spring clicks into position. The Unit is now locked in place.
Removal of the Unit requires the use of an extraction key. There are two holes located on either side of
the display (Figure 2-3). Place the key alternately in each hole to release the Unit from the tray.
2.6.2
Mechanical - Tray
Upon removing the MK12D+ Tray Assembly from its shipping container, the Unit must be removed
from the mounting Tray Assembly.
Position the assemblies on a flat surface; place a block behind it as shown in Figure 2-3. Insert the key
straight into the keyhole in the trim panel; exert sufficient pressure to release the spring lock. Upon
release the tension (eject) springs will pop the Unit outward, freeing it. SAVE THE KEY.
FIGURE 2-3 TYPICAL TRAY LOCK OPERATION