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2.3 Installation Considerations
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
required for installation of the GRA 5500.
The GRA 5500 requires two antennas to be installed for each system installation. One antenna is used to
transmit the radar signal, and the other is used to simultaneously receive the reflected signal.
2.3.1
Multiplex Operation (Dual and Triple Unit Installations)
Each GRA 5500 system fulfills all TSO minimum accuracy requirements when installed with either one or
two additional GRA 5500 systems on the same aircraft. Mutual interaction is not operationally significant.
See
Section 2.3.3
for guidance in planning antenna locations for multi-unit installations. The second and/
or third unit in a multi-unit installation is selected by strapping the respective discrete input(s) on each unit
per Table 2-5.
RADAR ALT SYSTEM ID
PROGRAM* 1
Open
Ground
Open
Ground
2.3.2
Installation Approval Considerations for Pressurized Aircraft
Cable installations (both wiring harness and coaxial antenna cables) on pressurized cabin aircraft require
FAA approved installation design and engineering substantiation data whenever such installations
incorporate alteration (penetration) of the cabin pressure vessel by connector holes and/or mounting
arrangements.
For needed engineering support pertaining to the design and approval of such pressurized aircraft
installations, it is recommended that the installer proceed according to any of the following listed
alternatives:
1. Obtain approved installation design data from the aircraft manufacturer.
2. Obtain an FAA approved STC, pertaining to and valid for the subject installation.
3. Contact the FAA Aircraft Certification Office in the appropriate Region and request identification
of FAA Designated Engineering Representatives (DERs) who are authorized to prepare and
approve the required installation engineering data.
4. Locate an appropriate consultant FAA DER from the "FAA Consultant DER Directory" at the
FAA "Designee and Delegation" web page.
5. Contact an aviation industry organization such as the Aircraft Electronics Association for
assistance.
190-01277-00
Rev. A
Table 2-5 System ID Discrete Inputs
RADAR ALT SYSTEM ID
PROGRAM* 2
Open
Open
Ground
Ground
GRA 5500 UNIT NUMBER
1
2
3
Not Allowed
GRA 5500 Installation Manual
Page 2-3
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