D. Lower radome carefully to closed position, and check to ensure that top aft edge does not interfere with fuselage skin. If an interference exists, raise and support radome in open position, slacken hinge bracket attachment screws, slide brackets forward relative to radome, and tighten screws. Repeat this procedure as many times as is necessary to eliminate interference between top, aft edge of radome and fuselage skin.
CAUTION: EXTREME CARE SHOULD BE EXERCISED WHEN LOWERING RADOME TO CLOSED POSITION AFTER INSTALLATION OF HINGES BECAUSE TOP AFT EDGE OF RADOME MAY INTERFERE WITH AND DAMAGE FUSELAGE SKIN.
E. Check the seal.
NOTE: Make sure that the seal ends do not touch at the bottom of the bulkhead. There must be an opening of 8.5 +0.2 inches at the bottom of the bulkhead to allow radome compartment drainage, i.e., there is no seal material obstructing the lower cutout.
F. Check nose radome seal for abrasions and deformation. Check that seal is bonded to bulkhead 7 inches on either side of airplane centerline and 2 inches that match each end of seal. Replace seal if necessary as follows:
NOTE: If problem exists with seal turning down, install three seal retainers, if not already installed (see detail C).
(1)
Clean bulkhead faying surfaces with solvent.
(2)
Apply adhesive to bulkhead seven inches on either side of airplane centerline and two inches that match each end of seal.
(3)
Apply adhesive to flat matching portion of seal and install with flat surface against bulkhead.
(4)
Allow adhesive to cure for 24 hours.
G. Check attachment clips on fuselage bulkhead, especially those adjacent to hinges, for binding on radome when radome is moved to closed position. If adjustment is necessary, slacken attachment bolts on appropriate clips and move clips inboard. Lower radome to closed position and install screws. Tighten screws sufficiently to bring clips into contact with inside face of radome, and then remove screws.
H. Open radome carefully to avoid disturbing position of adjusted clips. Tighten clip attachment bolts 100 to 125 pound-inches.
NOTE: If pressure sealant is disturbed on clip attachment bolts, sealant must be reapplied to ensure an adequate seal (Ref Chapter 51, Seals and Sealing).
I. If electrical interference in ADF system has been reported, check that bonding resistance between each clip and airplane structure is not more than 0.001 ohm.
NOTE: Any clip failing this test should be removed and reinstalled after cleaning faying surface between clip and structure to remove whatever sealant or foreign matter was causing high resistance.
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J. Check that mating surfaces are clean and bright and connect bonding jumper to proper attachment at either side of radome hinge. If electrical interference in ADF system has been reported, check that bonding resistance between bonding jumper and radome does not exceed
0.001 ohm.
K. With radome in closed position, check alignment of radome attachment screw holes with holes in attachment clips. If adjustment is necessary, insert a mandrel or similar tool of suitable diameter in appropriate screw holes in radome and clip and apply leverage to ease holes into alignment, taking care not to damage radome or clip by use of excessive force.
L. Install screws with antiseize compound in aft edge of radome.
NOTE: The torque of the bolts is 150 inch-pounds.
M. Inspect radome for contact with seal and gap (Fig. 401, Detail B).
N. Close weather radar circuit breakers.
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Nose Radome Installation 525
53-52-0 Page 404 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/89
525 Nose Radome Installation
Feb 20/89 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-52-0 Page 405
NOSE RADOME - INSPECTION/CHECK
1. General
A. The nose radome requires a check for security of installation and a check for evidence of lightning strikes (Ref 5-51-151).
2. Equipment and Materials
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