What does BF stand for?

Knives where the blade folds into the handle, like a Swiss Army knife, aren't illegal as long as the blade is shorter than 3in (7.

the blade folds into the handle, protecting the blade and the user from cutting themselves and reducing the overall size of the knife.

Specific problems include arthritis of wing fold, blade fold and control surface actuation mechanisms; canopy hazing; landing gear strut cracks and leaks; leaking seals for hydraulics and fuel tanks; popped and worn out fasteners; environmental control system inadequacy; and heat-dirt-contamination effects.

Smiths Aerospace has been awarded a contract to supply the integrated blade fold and pin puller actuator subsystem for Canada's 28 new Sikorsky H-92 maritime helicopters, designated the CH148 Cyclone by the Canadian Forces.

In addition to the HUMS, Smiths supplies the following systems on various H-60 models: --Voice and Data Recorders, Rotor Analysis and Diagnostic Systems, Rocket Interface Units, Ethernet Switching Hub (Michigan) --Health & Usage Monitors (Southampton, UK) --AFCS/ Module/ Fuel Management Panels (New York) --Interference Blanker Units (Florida) --APU Generators (Ohio) --Data Transfer Systems, Common Cockpit Keyset (Maryland) --Coax Cables (Times Microwave, Connecticut) --Landing Gear, center console & step (California) --Automatic Blade Fold Actuation (New Jersey) Note to editors: About the UH-60L Black Hawk: Produced by Sikorsky Aircraft Corporation, based in Stratford, Connecticut, the UH-60 was made to transport soldiers into combat.