TM 11-5840-281-35/1
Section III. REMOVAL AND REPLACEMENT;
DISASSEMBLY AND REASSEMBLY
(14) Loosen latches (43) and lift reflector (40)
5-7. General
from yoke.
(15) Remove six screws (42) and two latches
This section provides general support maintenance
(43).
removal and replacement, disassembly, and reassembly
(16) Remove four screws (44), lockwashers (45),
of mechanical assemblies of Radar Set AN/TPN-18
flat washers (46), and actuator support (47).
within the scope of general support maintenance. These
(17) Remove waveguide coupling (48), cover
instructions supplement the direct support maintenance
(49), screw (50), and wire rope assembly (51).
instructions provided in paragraphs 3-0 through 3-65.
(18) Remove four screws (52), lockwashers (53),
flat washers (54), waveguide (55), and performed
5-8.
Disassembly and Assembly of Azimuth
packing (56).
(19) Remove four screws (57), lockwashers (58),
flat washers (59), ring (60), and gasket (61).
a. Disassembly. To disassemble azimuth Antenna
(20) Remove three screws (62), nonmetallic
AS-1292/TPN-8 and yoke, proceed as follows:
washers (63), and two retaining straps (64).
(1) Remove four screws (1), lockwashers (2),
(21) Remove two nuts (65), pins (66), and
and flat washers (3).
waveguide (67).
(2) Remove four setscrews (4).
(22) Remove two screws (68), lockwashers (69),
(3) Remove horn and polarizer (5).
flat washers (70), and clamps (71) from yoke (72).
b. Assembly. To assemble azimuth Antenna AS-
NOTE
1292/TPN-8 and yoke, proceed as follows:
Refer to paragraph 5-9 for disassembly
(1) Attach polarizer support (39) to reflector (40)
procedures for the azimuth horn and polarizer
using six nuts (35), bolts (36), lockwashers (37), and flat
assembly.
washers (38).
(2) Attach horn and polarizer (5) to polarizer
(4) Remove nut (6), screw (7), lockwasher (8),
support (39) using four screws (1), lockwashers (2), flat
flat washer (9), and clamp (10).
washers (3), and setscrews (4).
(5) Remove nut (11), screw (12), lockwasher
(13), flat washer (14), and clamp (15).
NOTE
(6) Remove three screws (16), lockwashers (17),
If horn and polarizer assembly (5) was previously
flat washers (18), and two pins (19).
aligned to this reflector (40), setscrews (4) must
(7) Remove clinometer mount (20) from
be aligned to the drilled indentations in the horn
and polarizer. If this is a replacement horn and
(8) Remove two screws (21), flat washers (22),
polarizer or reflector, the antenna must be
one flat washer (23), and scope mount (24).
completely calibrated after assembly and
(9) Remove two screws (25), lockwashers (26),
setscrews installed as part of the calibration
flat washers (27), one flat washer (28), and mounting
procedure.
bracket (29).
(10) Remove four nuts (30), screws (31),
(3) Attach mounting bracket (29) to reflector (40)
lockwashers (32), flat washers (33), and identification
using two screws (25), lockwashers (26), flat washers
plate (34).
(27), and one flat washer (28).
(11) Remove six nuts (35), bolts (36),
(4) Attach scope mount (24) to mounting bracket
lockwashers (37), and flat washers (38).
(29) using two screws (21), flat washers (22), and one
(12) Separate polarizer support (39) from
flat washer (23).
reflector (40).
(13)Remove plug (41) from reflector.
5-5
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