TB 1--1520--251--20--02
(5) Carefully move and twist the radome until it separates from the sensor housing.
c Radome (with tabs) Installation
NOTE
A radome (without tabs) shall not be installed on the aircraft for any reason.
WARNING
Isopropyl alcohol is flammable and toxic to eyes, skin, and respiratory tract. Skin and eye protection are required.
Avoid repeated or prolonged contact. Good general ventilation is normaladequate. If injury occurs, seek medical
aid.
NOTE
Allow area to dry completely before proceeding (approximately five minutes).
(1) Clean bonding area on sensor housing (where epoxy is to be applied) using alcohol and either cotton swabs or Jean
(lint--free cloth.
(2) See Figure 5 for illustration of installed radome, 240A058.
(3) Take adhesive materials from pack and squeeze approximately 1/2--inch diameter beads of part A and part B onto
a smooth, flat, rigid metal or plastic mixing surface.
(4) Mix parts together using wooden end of cotton swab (or equivalent) until a uniformly white color is present.
NOTE
Although it is not mandatory to remove old tabs and epoxy, it is preferable to do so. However, if this is a second
replacement of a radome and old tabs and/or epoxy are present from last radome, the new tabs must be offset ap-
proximately 5 to10 degrees from the old marks.
(5) Partially install new radome on housing to establish contact areas with radome tabs and epoxy or marks. Back ra-
dome off to allow complete coverage of tab area. Radome tabs should be at the 90--degree and 270--degree marks on
the sensor if old tabs are not present.
(6) Remove radome from sensor housing.
NOTE
Adhesive must not be applied to the skirt, radome, or round portion of the radome because
undesirable contact with the sensor housing may result.
(7) Apply mixed epoxy adhesive on sensor housing where tabs will be attached (see Figure 4 ). Apply to approximate
thickness of 1/32--inch to 1/16--inch.
(8) Align tabs with bonded area of housing and slide radome on sensor housing. Ensure that adhesive does not contact
spiral circuit or sensor housing interface area.
(9) Rotate radome on sensor housing approximately 5 degrees back and forth to ensure good wetting of housing.
NOTE
Evidence of squeeze out beads (1/16--inch to 1/8--inch) should be noted around the
perimeter of the tab.
(10) If necessary, apply additional adhesive or wipe off excess from around radome tab surface using alcohol and cotton
swab to attain correct squeeze out bead.
(11) Allow adhesive to cure for approximately one hour.
4
