HGA-7001
Installation Manual
Document: 862-A0089_IM issue 1.6
COMPANY CONFIDENTIAL
Page 24 of 45
5.
MOUNTING
5.1
Introduction
The following section provides information regarding the mounting of the HGA-7001 onto the aircraft
fuselage.
CAUTION: THE FUNCTIONALITY OF THE UNIT DEPENDS ON THE CORRECT INSTALLATION
THEREOF, AND DEVIATION FROM THE INSTALLATION PROCEDURE BELOW MAY CAUSE
THE UNIT TO FAIL OR RESULT IN DAMAGE TO THE FUSELAGE OR ANTENNA.
NOTE:
IT IS EXPECTED OF THE INSTALLER TO FOLLOW THE APPLICABLE AIRCRAFT
MANUFACTURER’S ELECTRICAL INSTALLATION AND BONDING REQUIREMENTS
THROUGHOUT THE INSTALLATION PROCESS.
5.2
Mounting Location and General Considerations
(1)
The HGA-7001 must be mounted on the top of the fuselage with a clear view of the sky.
(2)
The installation must provide adaptation of the flat underside of the HGA-7001 to the
fuselage. Note that even in case of the antenna being mounted on a flat surface, point (3)
below still applies.
(3)
The HGA-7001 is fixed to the fuselage via an adaptor plate or an intermediate mounting plate
by means of 8 bolts, which are accessed from the top surface of the antenna. The bolts must
have a minimum tensile strength of 10 000 N (2450 lb). The mounting-hole dimension must
be 5.20 mm (0.205”) in diameter.
(4)
The factors that influence the final position are listed in the following paragraphs:
(a)
Alignment
1)
The HGA-7001 must be installed with its long axis aligned with the fore/aft axis of
the aircraft. The rear of the antenna is tapered whereas the front of the antenna is
rounded in shape.
2)
The connector compartment is situated in the rear of the antenna, underneath the
Tail Cap.
3)
The HGA-7001 can be mounted slightly to one side of the fuselage centre line. The
installer must take into account that mounting the antenna off centre compromises
the coverage on the opposite side. As a guideline, 1° off centre is considered
insignificant and up to 3 to 4° off centre is deemed acceptable. When planning a
larger offset than this contact the Supplier to discuss the implications thereof.
4)
The HGA-7001 can be mounted with a slight nose-up or nose-down attitude. If
mounted in a slightly nose-down angle, precautions must be taken to prevent
corrosion caused by water collecting between the aircraft fuselage and the base of
the antenna in the forward region.
5)
Offset angles (see 3) and 4) above) may be set within an SDU (refer to the
relevant SDU installation manual). The SDU may accept azimuth misalignment
with respect to the longitudinal axis, and roll and pitch misalignments relative to
the aircraft’s horizontal reference. These three angles need to be determined to an
accuracy of 0.25° by the use of an alignment protractor and inclinometer. For
further information please contact the Supplier. The roll and pitch alignment of the
antenna can be determined by subtracting the aircraft attitude angles from the
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