Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 1-6
1.7 UNITS & ACCESSORIES REQUIRED BUT NOT SUPPLIED
A. Altitude Encoding Device, conforming to TSO C88a.
B. Model 9900 and 9900A: Two L-band antennas, maximum VSWR 1.4 at
1090Mhz conforming to TSO C66a, C66b, or C74c. The Comant CI 105 is
recommended for most applications, or Comant CI 100 for higher speed
aircraft. Comant Industries, Santa Fe Springs, CA, telephone: 562-946-
6694.
C. Wiring:
Antennas: See Figure 1-3 for cable requirements.
Display: Multi-Conductor Shielded cable for EIA-232 applications.
Optionally, twinaxial cable such as Belden 9222, may be used.
Processor: #22 AWG (power and ground); #24 AWG (other connections).
Suppression and Coupler: Use 50-ohm coaxial cable.
D. Circuit breaker, trip-free resettable, 3 Amperes.
E. A BNC T-adapter is required when two Transponder Couplers are used.
F. Standard BNC plug connectors for Coupler cable ends, two per transponder.
G. Standard TNC plug connectors for antenna cable ends at the TCAD
Processor, and connectors appropriate for the antennas used.
1.8 INSTALLATION APPROVAL BASIS
The person who performs or supervises the installation of the Ryan TCAD may be
required to prepare FAA form 337. See Figure 1-2 for a Sample Description of Work
Accomplished. The Ryan TCAD is an isolated self-contained system operating as a
supplement to “see and avoid” procedures. An original STC has been awarded, making
the system eligible for follow-on field approval consideration. Data that can be used as a
basis for approval for return to service are:
A. STC Documents (Supplied in the Literature Pack).
B. AC 43.13-1 and -2; Acceptable Methods, Techniques, and Practices.
C. DO-160C; Environmental Conditions and Test Procedures for Airborne
Equipment (see Figure 1-4).
D. Manufacturer's installation instructions.
E. The antenna locations must be structurally substantiated.
Equipment installation procedures do not differ significantly among various aircraft. The
installation and operation of the Ryan TCAD does not materially affect aircraft operation
or performance.
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