TB 1-1520-238-30-20
CAUTION
Observe edge clearance/distance from bracket when drilling rivet pat-
tern.
14.2. Fabricate Leg per Figure 4. NDI after fabrication TM 1-1500-335-23. Install per Figure 1. (Weld per
step 14.7.).
14.3. Strip paint from area to be welded.
14.4. Test fit and drill Doubler for NAS1738BX fasteners.
14.5. Cleco Doubler in place. Test fit Leg and tack weld to Doubler.
14.6. Remove Leg/Doubler from Diffuser.
14.7. Complete Doubler weld to Leg with TIG welding procedure using 4043 welding rod, HW 20 torch and
20 CFM argon flow.
14.8. NDI IAW reference TM 1-1500-335-23, treat, use same materials as listed in paragraph 13.5 prime and
paint as required faying surface of Doubler.
14.9. Weld Leg to Support assembly with TIG welding procedure using 4043 welding rod, HW 20 torch and
20 CFM argon flow.
14.10. NDI IAW reference TM 1-1500-335-23.
14.11. Drill out existing rivets and remove right hand bottom plate (P/N 7-311332020-5).
14.12. Layout and trim pattern per Figure 3.
14.13. Trim diffuser, and break sharp edges.
14.14. Reinstall right bottom plate (P/N 7-311332020-5). Use existing holes in bracket to locate rivets per
14.15. Remove gasket material from the "Ten to Two o'clock" area per Figures 1 and 2.
14.16. Touch-up all reworked areas using MIL-C-5541 Class 1A, (Corrosion resistant coating) and MIL-
PRF-85582, Type 1, Class 2 (paint primer).
14.17. Re-identify part as [7-511332020-3, Mod per this TB], per MIL-STD-130, and HP8-5, Ink Permanent
Marking, 30001 Black.
15. UPGRADE OF CURRENT MODIFIED INTERMEDIATE GEAR BOX FAIRING.
CAUTION
Do not cut into fairing.
15.1. While fairing is still installed on the aircraft, remove the two existing rubber strips from both halves of
the fairing by pulling strips away from the fairing. A knife may aid in the separation.
15.2. Cut piece of 3M 8641 Tape to dimensionally match each of the two rubber strips removed from the
fairing.
15.3. Prepare fairing surface (ensure all residual adhesive has been removed) and apply 3M #86 primer per
manufacturer's instructions.
15.4. Apply rubber strips in the same location as previous rubber strips.
15.5. Remove right and left fairings, taking care to maintain tape gap between two halves of each side.
15.6. Powder exposed sticky tape surface between both fairing halves with Talcum Powder to prevent
surface from retaining FOD.
15.7. Carefully reinstall right and left fairings.
15.8. Apply a fillet of AMS-S-8802 CLB-2, sealant to the forward and aft edges of the rubber strips.
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