51-20-01 CURTISS-WRIGHT Applies to Model C-46 Series aircraft equipped with C-4 Cockpit Light Assembly. \n\n\tCompliance required within 100 hours' time in service after the effective date of this amendment unless already accomplished. \n\n\tTo eliminate an electrical fire hazard existing in the pilot's compartment, the following rework must be accomplished: \n\n\t1. Rework the C-4 cockpit light rheostat assembly in accordance with Figure 2. Fabricate insulator strip per Figure 2(a), and install as shown in Figure 2(b). \n\n\n\n\nSECTIONAL VIEW OF COCKPIT LIGHT CASE - TYPE C-4A & C-4, WITH RHEOSTAT INSULATOR INSTALLED \nFIGURE 2 \n\n\t(U.S.A.F.T.O. No. 03-5G-12, dated September 8, 1950, covers this same subject.) \n\n\t2. Revise the wiring to the C-4 lamp assembly as shown in Figure 3. \n\n\n\n\t(Page 410D, Figure 301B of AN 01-25L-2 covers this same subject.) \n\n\tRevised December 28, 1964.