(1)
Apply a layer of alodine on the airplane skin as far as 0.25 inch beyond the edge of the antenna base.
(a) Let each layer dry for the correct cure time.
(2)
On top of the alodine, apply two layers of primer, BMS 10-79 type
III.
D. AIRPLANES WITH SL 51-35;
If the airplane surface has corrosion or other damage, do these
steps to prepare the airplane surface:
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ATC ANTENNA (REMOVED)
ATC Antenna Installation
Figure 401
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34-53-03
Jul 25/78
(1)
Apply a layer of alodine on the airplane skin as far as 0.25 inch beyond the edge of the antenna base.
(a) Let each layer dry for the correct cure time.
(2)
On top of the alodine, apply two layers of primer, BMS 10-79 type
III.
E. Apply a very thin coat of BMS 3-27 on the mating surface, screw holes, and connector hole.
F. Lubricate the O-ring with BMS 3-24.
G. Install the O-ring on the antenna.
NOTE: Do not get BMS 3-27 on the O-ring or in the O-ring groove.
____
H. Apply a layer of Dow Corning Compound No. 4 on the coaxial connector if a moisture guard is used on the installation.
I. Connect the coaxial cable to the antenna.
J. Put the antenna into position.
K. Apply a layer of BMS 3-27 on the threads and shank of the cadmium plated screws.
L. Lightly tighten the cadmium plated screws to hold the antenna in position.
CAUTION:_______TIGHTEN THE SCREWS MANUALLY TO THE CORRECT TORQUE VALUE. USE OF POWER OR AIR TOOLS TO TIGHTEN THE SCREWS CAN CAUSE DAMAGE TO THE ANTENNA SURFACE.
M. Manually tighten the screws to 20-25 pound-inches of torque. XA N. Deleted
O. Carefully remove excess BMS 3-27 from the screw heads and around the edge of the antenna base with MEK.
NOTE:____Care must be taken to completely remove excess BMS 3-27. If the BMS 3-27 is not completely removed, poor adhesion of the weather proof sealant will result.
P. Apply fillet of aerodynamic smoother around antenna base using sealing gun or tube.
NOTE:____Make certain no air is trapped during filling. Overfill to allow for smoothing and leveling.
Q. Use spatula to make an even 45-degree fillet of aerodynamic smoother.
R. Remove the unwanted aerodynamic smoother from around the antenna base.
S. Close ATC circuit breakers on panel P7.
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5. Test Replaced ATC Antenna
_________________________
A. On Airplanes with Collins 621A-6/6A Transponders perform the following:
(1)
Provide electrical power (Ref 24-22-00).
(2)
Check that ATC system circuit breakers are closed.
(3)
On ATC control panel, select system to be tested.
(4)
Check that ANT fault indicator on transponder front panel shows black.
(5)
If fault indicator is yellow, activate reset switch. Verify fault indicator shows black.
(6)
Activate TEST on transponder front panel. Verify reply light comes on and ANT fault indicator remains black.
(7)
If no longer required remove electrical power (Ref 24-22-00).
B. On Airplanes with Transponders other than Collins 621A-6/6A
(1) Perform ATC Adjustment/Test (Ref 34-53-00) paragraph 3. or 4. as appropriate.
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DME SYSTEM - DESCRIPTION AND OPERATION
______________________________________
1. General (Fig. 1 and 2)
_______
A. The DME (distance measuring equipment) system automatically measures the distance (in nautical miles) between the airplane and a selected ground station. The system measures the airplane-to-station slant-range distance (line-of-sight) and the information is displayed on an analog readout indicator as miles-to-go. Distance is determined by the round trip travel time of UHF interrogation-reply transmissions (between the airplane and the ground station) in the 960 to 1215 MHz range.
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