Summary
The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to certain Titeflex Corporation hoses installed on Boeing 737-300, -400, -500, -600, -700, -700C, -800, -900, 747-400, 757-200, -300, 767-200, -300, and -300F airplanes. This proposal would require within 24 months after the effective date of the AD, inspection of certain Titeflex Corporation hoses for proper date and paint code, replacement if necessary, and if necessary, inspection for proper heat treatment of aluminum B-nuts. This proposal is prompted by certain Titeflex Corporation hoses discovered with incorrect heat treatment of B-nuts. The actions specified by the proposed AD are intended to prevent fire extinguishing system and fuel system hose failure due to improperly heat treated aluminum B-nuts.