Home' RTCA Documents for Review : DO-262D Contents 52
© RTCA, 2018
Adjustment of Equipment – The circuits of the equipment under test shall be
properly aligned and otherwise adjusted in accordance with the manufacturer's
recommended practices prior to application of the specified tests.
d. Test Equipment – All equipment used in the performance of the tests should
be identified by make, model and serial number where appropriate, and its
latest calibration date. When appropriate, all test equipment calibration
standards should be traceable to national and/or international standards.
Test Instrument Precautions – Due precautions shall be taken during the
tests to prevent the introduction of errors resulting from the connection of
voltmeters, oscilloscopes and other test instruments across the input and output
impedances of the equipment under test.
Ambient Conditions – Unless otherwise specified, all tests shall be made
within the following ambient conditions:
(1) Temperature: +15 to +35 degrees C (+59 to +95 degrees F)
(2) Relative Humidity: Not greater than 85%
(3) Ambient Pressure: 84 to 107 kPa (equivalent to +5,000 to -1,500 ft)
(+1,525 to -460 m)
When tests are conducted at ambient conditions which differ from the above
values, allowances shall be made and the differences recorded.
g. Connected Loads – Unless otherwise specified, all tests shall be performed
with the equipment connected to loads having the impedance values for which it
h. EMI Testing – Only the AES in (not the test equipment) need be subjected to
the electromagnetic environment as specified in Table 2-9 For the antenna
subsystem, a matched load should be connected, and the antenna subsystem
performance verified to requirements after application of HIRF.
For specific airframes, the aircraft manufacturer may require the
interconnecting wiring to be included in the specified
Warm-up and Stabilization Requirements – Unless otherwise specified, all
tests shall be conducted after a minimum equipment warm-up period of not less
than five minutes. In addition, the frequency reference source shall have
completed its warm-up cycle, if any, and any power-on self-test(s) shall have
been completed prior to testing.
j. Special Cooling Requirements – The manufacturer shall specify any special
cooling requirements for any of the specified tests.
AES Application Test Conditions
Antenna Subsystem Test Conditions
The Low Earth Orbit characteristics of the satellite system make passive,
near-omni-directional antennas highly desirable. The requirements
contained below assume a non-steered antenna system. Installations
desiring to use actively switched or steered antenna systems are referred
to RTCA Document DO-210D, Section 2.4.3, for appropriate test
Antenna Under Test
The antenna under test shall not include the LNA, HPA, or front end filter(s)
associated with the RF Front End subsystem. For steered antennas, or active
antennas requiring any other type of control, a suitable control unit shall be included in
the test. If a radome forms part of the antenna, this shall also be installed during the
measurements. The antenna test installation shall also include any adapter plates,
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