(Ref. Fig. 401/TASK 34-42-11-991-001) R **ON A/C 061-099, 102-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 401A/TASK 34-42-11-991-001-A)
**ON A/C ALL
(1) Make sure that the O-ring (6) is in good condition. If the O-ring (6) is not in good condition, use a new one.
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(2)
Install the O-ring (6).
NOTE : Use the old Teflon-Gasket unless it is damaged.
____
(3)
Install the teflon-gasket (8) to the antenna (4).
(4)
Remove the blanking caps from the electrical connectors.
(5)
Make sure that the electrical connectors are clean and in the correct condition.
(6)
Connect the coaxial connector (2) to the antenna connector (3).
(7)
TORQUE the coaxial connector (2) to 0.265 m.daN (23.45 lbf.in) and safety it with MISCELLANEOUS (Material No. 19-009) or safety it with one drop of BONDING AND ADHESIVE COMPOUNDS (Material No. 08-048) and identification with safety-paint.
(8)
Put the antenna (4) in position and install the screws (5). Make sure that the alignment mark on the antenna points in the direction of flight.
NOTE : The alignment mark can be different for different antennas.
____
For example, it can be:
-
A FWD sign
-
A dot at the end of a line
-
A datum mark.
(9) TORQUE the screws (5) to between 0.3 and 0.35 m.daN (26.54 and 30.97 lbf.in) diagonally opposite.
NOTE : The antenna mounting screws (5) give the electrical bonding
____ between the antenna (4) and the fuselage structure (1) (Ref. TASK 20-28-00-912-005).
(10)
Remove the unwanted sealant with a nonmetallic scraper.
(11)
Remove the remaining masking tape.
(12)
Make sure that the bonding contact resistance between the antenna (4) and the fuselage structure (1) is not higher than 5 milliohms (Ref. TASK 20-28-00-912-005).
(13)
Make a sealing bead with SEALANTS (Material No. 09-016) around the antenna (4).
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R (14) Apply SEALANTS (Material No. 09-016) to the heads of the screws (5).
R (15) Make the contour of the sealant on the screws (5) and around the antenna (4) smooth.
R (16) Let the sealant cure.
R (17) Apply STRUCTURE PAINTS (Material No. 16-003) to the sealant around the base of the antenna (4).
R (18) Apply PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-001) to the sealant on the head of the screws (5).
Subtask 34-42-11-420-054
D. Installation of the Radio Altimeter Antenna (Alternative) (Ref. Fig. 402/TASK 34-42-11-991-003)
R R (1) Make sure that the O-ring (6) is in good conditiopn. If the O-ring (6) is not in good condition, use a new one.
R (2) Install the O-ring (6).
R (3) Apply the SPECIAL MATERIALS (Material No. 05-013) to the bottom of the antenna (4).
R (4) Apply the SEALANTS (Material No. 09-019) to the area of the fuselage that makes an interface with the antenna (4).
R (5) Remove the masking tape from the screw holes and the hole for the antenna connector.
R R (6) Remove the blanking caps from the electrical connectors.
R (7) Make sure that the electrical connectors are clean and in the correct condition.
R (8) Connect the coaxial connector (2) to the antenna connector (3).
R (9) TORQUE the coaxial connector (2) to 0.265 m.daN (23.45 lbf.in) and safety it with MISCELLANEOUS (Material No. 19-009) (7) or safety it with one drop of BONDING AND ADHESIVE COMPOUNDS (Material No. 08-048) and identification with safety-paint.
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R (10) Put the antenna (4) in position and install the screws (5) to the fuselage structure.
NOTE : The alignment mark can be different for different antennas.____ For example, it can be: - A FWD sing - A dot at the end of a line - A datum mark.
R (11) TORQUE the screws (5) to between 0.3 and 0.35 m.daN (26.54 and 30.97 lbf.in) diagonally opposite.
NOTE : The antenna mounting screws (5) give the electrical bonding____ between the antenna (4) and the fuselage structure (1) (Ref. TASK 20-28-00-912-005).
R (12) Remove the unwanted sealant with a nonmetallic scraper.
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