NOTE: Make sure the spring seal is in place between the aft fairing panel and the torque tube cutout panel during installation.
(b)
Install the fasteners (stainless steel bolts and dimple washers).
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Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-51-21 Page 401
1) Install the stainless steel bolts and dimple washers in the same locations on the fairing panel as they were when you removed the panel.
NOTE: If you install different hardware in these locations you can get an unacceptable electrical bond.
(c) Measure the electrical bonding resistance between the conductive fasteners and the conductive surface of the fairing panel.
NOTE: You should make the resistance measurement before you paint the panel and the mounting hardware. If the fairing panel and bolts have been covered with paint, you may not get a correct measurement. In this case, use two sharp probes and make sure the probes contact the conductive surface of the panel and the structure. Then, measure the resistance.
1) Make sure the maximum resistance is not more than 300,000 ohms.
(7) Touch up the finish.
B. Connect emergency exit light wiring at light assembly and close circuit breakers.
C. Connect ADF sense antenna coupler per Chapter 34, ADF Sense Antenna Couplers -Removal/Installation.
D. Perform operational check of emergency exit light per Chapter 33, Emergency Lighting.
E. Perform operational check of ADF system per Chapter 34, Automatic Direction Finder Systems
- Adjustment/Test.
F. Use aliphatic naphtha to clean the areas that you will seal.
G. Apply sealant to the fairing panel joints.
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NOSE RADOME - DESCRIPTION AND OPERATION
1. General
A. The nose radome extends forward from body station 178. The two main functions of the radome are to serve as a fairing and to house the weather radar antenna and the glide slope antenna director bar.
B. The radome is a cone-shaped structure of fiberglass and is hinged at two places to the top side of the bulkhead at body station 178. Further attachment of the radome is by fasteners which screw into clips on the bulkhead at body station 178. In the open position the radome is supported by rods.
C. The weather radar antenna is cantilevered from the bulkhead at body station 178.
D. The nose of the radome is equipped with erosion protection. The radome is provided with lightning diverter strips on the exterior surface (not on all airplanes).
E. The glide slope antenna director bar is a passive element of the glide slope antenna used to alter the glide slope radiation antenna patterns such that the navigation units have maximum glide slope sensitivity. The bar consists of a 13-inch strip of pressure-sensitive aluminum foil tape installed horizontally inside the nose radome approximately 22 inches forward of the aft edge of the nose radome top centerline.
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Oct 20/87 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-52-0 Page 1
NOSE RADOME - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Micro-ohmmeter capable of measuring up to 0.001 ohm
B. Resistance Measuring Probe - F70328-1
C. Antiseize Compound - MIL-C-16173C, Grade 2 (Ref 20-30-21)
D. Solvent - Toluene (Ref 20-30-31)
E. Adhesive - BAC 5010, Type 68 (Ref 20-30-11)
2. Remove Nose Radome (Fig. 401)
A. Open WEATHER RADAR AC and WEATHER RADAR DC circuit breakers on panel P18.
B. Remove screws attaching aft edge of radome to clips on fuselage bulkhead.
C. Open radome and support in open position by installing support rods on each side.
CAUTION: DO NOT OPEN RADOME IF WINDS EXCEED 15 KNOTS.
D. Disconnect either end of bonding jumper at radome hinge.
E. Remove bolts attaching hinge arms to hinge fittings on radome and remove radome from fuselage.
NOTE: When removing bolts, be prepared to catch shims installed between hinge arms and hinge fittings. Observe installed positions of shims to facilitate installation of same radome.
3. Install Nose Radome (Fig. 401)
A. Prepare radome for installation (new radome).
(1)
Install erosion protection as required.
(2)
Install hinge brackets, serrated plates, and fillers on radome with attachment screws, and position brackets so that they bear against flange of reinforcement angle. Tighten bolts.
B. Open WEATHER RADAR AC and WEATHER RADAR DC circuit breakers on panel P18.
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