Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 2-1
SECTION II
INSTALLATION
2.1 GENERAL
The Ryan TCAD should be installed according to this manual and AC 43.13-1A and -2A.
Cable harnesses and mechanical supports must be fabricated by the installing agency to
these requirements. This Section contains interconnect diagrams, mounting dimensions,
antenna placement and other information pertaining to installation. See Section VI for
installation tips. For instructions regarding multifunction displays, see Model 9900B
Multifunction Display Interface Installation Instructions, Document 32-2304.
The TCAD consists of three major components, plus antennas:
• Display with Mounting Clamp
• Processor with Mounting Tray
• Transponder Coupler
In addition, two L-band transponder antennas are required, one top mounted on the
aircraft fuselage, and one bottom mounted on the aircraft fuselage. The Model 9900B
antennas are supplied, the antennas for the Model 9900 and 9900A are not supplied. A
second display is optional. Figure 2-1 illustrates the three major components.
Refer to Section IV for checkout and Customer Care checklist.
2.2 UNPACKING AND INSPECTION
Exercise care when unpacking the equipment. Make a visual inspection of the unit for
evidence of damage incurred during shipment. If a claim for damage is to be made, save
the shipping container to substantiate the claim. The claim should be filed with the
transportation company. Retain the container and packaging material after the equipment
has been removed should equipment storage or reshipment become necessary.
2.3 TRANSPONDER AND ENCODER REQUIREMENTS
The on-board transponder(s) must accept suppression input (often called DME or mutual
suppression). A transponder is not required for proper operation of the TCAD.
An altitude encoder is required. Encoders that conform to TSO C88a can be used.
Normally, TCAD can be paralleled on the output of an encoder without degrading the
encoder performance. The installing agency must make this determination. TCAD
altitude input lines are diode isolated (see figure 2-18).
Ordinarily, TCAD should be connected to the encoder that is connected to the
transponder.
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