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Static Test Adapter
Blanking Adapter*
Miscellaneous
Adapters
Pitot Pre-Test &
Assembly Integrity
Fixture
Air Data
Accessories Kit
S-105 PS48953-4-6 PT14895 ADA105-612
S3A PSS31570-4-6-6 0856 0E5 PT421-570
S-35 PS93535-4-6 PT19353
SA227
C26D P14789CA-4 33410S-70-4
33410S-70B* PT11882 ADAM3-612
T/45
PS52437M1-4-6
PS63548-4-6
(Pitot Static Boom)
855JG
0092BH3 PT15243 M1 T45-612
T50 PSB85709M-3-4 SLZ8140-14 PT421-709 T50-612
T.133 P29932-4 S20133-4 PT11SS2 ADAT133-612
T/46A PSS88946-4-6-6 856MW-FT1&2 PT18894 T/46A-612
Tornado PS53326-4H-6H
P40951-4H
855EG-BV(Nose)
853BT-JC (Side)
53510-346-4H
53510B-346* 421-3326
421-0951
Tucano 18821-4 33410-70-4H
33410-B70* PT11882 ADTUC-612
U2 P20706-4 102DG2U-2 SS44222-6 PT421-706
SPHERICAL NEAR FIELD RADOME TEST FACILITY FOR NOSE-MOUNTED
RADOMES OF COMMERCIAL TRAFFIC AIRCRAFT
Marcel Boumans marcelb@orbitfr.de
Ulrike Wagner ulrikew@orbitfr.de
ORBIT/FR-Europe GmbH
Johann-Sebastian-Bach-Str. 11, 85591 Vaterstetten, Germany
ABSTRACT
Typically radome tests are performed on outdoor far field
ranges or compact ranges. ORBIT/FR has designed, build
and qualified a unique spherical near-field radome test
facility for the nose-mounted radomes of commercial
traffic aircraft for the so-called “after repair” tests
according to the international standard RTCA/DO-213, as
well as the aircraft manufacturers Component
Maintenance Manuals. The facility is extremely compact
(chamber size 5.7 m x 5.2 m x 3.2 + 0.7 m, L x W x H),
can handle radomes as small as used on the Canadair and
as large as used on the Airbus-380 and can be installed
directly in the repair workshop for such radomes.
The tests performed are transmission efficiency and side
lobe level increase. The system is completely automated,
so that a workshop technician can operate the facility.
Utmost attention has been paid to operational aspects and
both operator and equipment safety.
After the measurements are done, a test report is fully
automatically generated according to RTCA requirements
and classifications. The facility is equipped to test all
standard Airbus, Boeing, Canadair and Dash nose
radomes.
Keywords: Radome Measurements, Transmission
Efficiency, Sidelobe Increase, Spherical Near Field
1. Introduction
RTCA Inc. is a not-for-profit corporation formed to
advance the art and science of aviation and aviation
electronic systems for the benefit of the public. The
organization functions as a Federal Advisory Committee
and develops consensus based recommendations on
contemporary aviation issues.
The RTCA/DO-213 standard is defined in the documents
“Minimum Operational Performance Standards for Nose-
Mounted Radomes” dated Jan 14, 1993, with “Change
No. 1 to RTCA/DO-213 Minimum Operational
Performance Standards for Nose-Mounted Radomes”,
dated Jun 23, 1995.
The presented test facility allows RF testing compliant to
the RTCA/DO-213 standard, in particular for
Transmission Efficiency and Side Lobe Level Increase
(the so-called “after repair” test requirements). Software
modifications to also include Incident Reflection, Beam
Deflection and Beam Width are under development. This
facility is not intended for any of the environmental tests
also defined in document RTCA/DO-213.
In addition the aircraft manufacturers requirements,
which sometimes define deviations from the standard
RTCA/DO-213, are taken into account. In particular the
Airbus Component Maintenance Manual (CMM) requires
sidelobe measurements throughout the entire predictive
windshear (PWS) electromagnetic window, where
RTCA/DO-213 requires this only in the forward
direction.
The facility design is unique in that it is based on antenna
near field technology. This allows to reduce the size of
the facility significantly, so that it can be build indoor,
and can be environmentally controlled. This reduces
infrastructure cost and increases availability and
accuracy. The acquired data is transformed to the far
field, so that the data analysis is based on highly accurate
far-field data.
It can be used for Qualification/Preproduction Testing,
Quality Assurance/Production Testing and so called After
Repair Testing. The facility is designed for use with a
multitude of radomes, for easy and safe handling of these
radomes, and for fast and efficient testing. In particular
for production and after repair testing, the facility is
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