47-10-13 LOCKHEED: (Was Mandatory Note 15 AD-763-3.) Applies to All Model 49 Serials Up to and Including 2075.
Compliance required prior to July 1, 1947.
(a) On all firewalls, replace aluminum alloy bulkhead fittings for fuel, oil, and hydraulic lines with nickel steel fittings or others of equivalent fire resistance.
(LAC Service Bulletin 49/SB-108 covers this same subject.)
(b) In nacelle zones 1 and 2 replace all buting having cut-length hose connections with flexible coupled hose assemblies.
(LAC Service Bulletin 49/SB-103 covers this same subject.)