|  | B |
SECTION B — PERFORMING OPERATIONS

TRANSPORTING

|  | B64 |
AIRCRAFT; AVIATION; COSMONAUTICS

|  | B64C |
AEROPLANES; HELICOPTERS (air-cushion vehicles Fulltext... Hierarchy... Expanded...B60V)

|  | B64C 1/00 - B64C 7/00 |
Aircraft structures or fairings (boundary-layer controls Fulltext... Hierarchy... Expanded...B64C 21/00)

|  | B64C 1/00 |
Fuselages; Constructional features common to fuselages, wings, stabilising surfaces, and the like (aerodynamical features common to fuselages, wings, stabilising surfaces, and the like Fulltext... Hierarchy... Expanded...B64C 23/00; flight-deck installations Fulltext... Hierarchy... Expanded...B64D)

|  | B64C 1/02 |
· | Multiple fuselages; Tail booms

|  | B64C 1/04 |
· | constructed as flying-boat hulls

|  | B64C 1/06 |
· | Frames; Stringers; Longerons

|  | B64C 1/08 |
· · | Geodetic or other open-frame structures

|  | B64C 1/10 |
· · | Bulkheads

|  | B64C 1/12 |
· · | Construction or attachment of skin panels

|  | B64C 1/14 |
· | Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens (fairings movable in conjunction with undercarriage elements Fulltext... Hierarchy... Expanded...B64C 25/16; bomb doors Fulltext... Hierarchy... Expanded...B64D 1/06)

|  | B64C 1/16 |
· | specially adapted for mounting power plant

|  | B64C 1/18 |
· | Floors

|  | B64C 1/20 |
· · | specially adapted for freight

|  | B64C 1/22 |
· | Other structures integral with fuselages to facilitate loading

|  | B64C 1/24 |
· | Steps mounted on, and retractable within, fuselages (readily removable Fulltext... Hierarchy... Expanded...B64D 9/00)

|  | B64C 1/26 |
· | Attaching the wing or tail units or stabilising surfaces

|  | B64C 1/28 |
· | Parts of fuselage relatively movable to improve pilots view

|  | B64C 1/30 |
· | Parts of fuselage relatively movable to reduce overall size for storage

|  | B64C 1/32 |
· | Severable or jettisonable parts of fuselage facilitating emergency escape (ejector seats Fulltext... Hierarchy... Expanded...B64D 25/10)

|  | B64C 1/34 |
· | comprising inflatable structural components

|  | B64C 1/36 |
· | adapted to receive aerials or radomes (aerials or radomes per se Fulltext... Hierarchy... Expanded...H01Q)

|  | B64C 1/38 |
· | Constructions adapted to reduce effects of aerodynamic or other external heating

|  | B64C 1/40 |
· | Sound or heat insulation

|  | B64C 3/00 |
Wings (stabilising surfaces Fulltext... Hierarchy... Expanded...B64C 5/00; ornithopter wings Fulltext... Hierarchy... Expanded...B64C 33/02)

|  | B64C 3/02 |
· | of allowing aircraft

|  | B64C 3/04 |
· | of supersonic aircraft

|  | B64C 3/06 |
· | Multiplane wings

|  | B64C 3/08 |
· · | Tandem plane wings

|  | B64C 3/10 |
· | Shape of wings

|  | B64C 3/12 |
· · | Disc or ring shape

|  | B64C 3/14 |
· · | Aerofoil profile

|  | B64C 3/16 |
· · | Frontal aspect

|  | B64C 3/18 |
· | Spars; Ribs; Stringers (attaching wing unit to fuselage Fulltext... Hierarchy... Expanded...B64C 1/26)

|  | B64C 3/20 |
· | Integral or sandwich constructions

|  | B64C 3/22 |
· | Geodetic or other open-frame structures

|  | B64C 3/24 |
· | Moulded or cast structures

|  | B64C 3/26 |
· | Construction, shape, or attachment of separate skins, e.g. panels

|  | B64C 3/28 |
· | Leading or trailing edges attached to primary structures, e.g. forming fixed slots

|  | B64C 3/30 |
· | comprising inflatable structural components

|  | B64C 3/32 |
· | specially adapted for mounting power plant

|  | B64C 3/34 |
· | Integrally-constructed tanks, e.g. for fuel (other aircraft fuel tanks or fuel systems Fulltext... Hierarchy... Expanded...B64D)

|  | B64C 3/36 |
· | Structures adapted to reduce effects of aerodynamic or other external heating

|  | B64C 3/38 |
· | Adjustment of complete wings or parts thereof (adjustable stabilising surfaces Fulltext... Hierarchy... Expanded...B64C 5/00)

|  | B64C 3/40 |
· · | Varying angle of sweep

|  | B64C 3/42 |
· · | Adjusting about chordwise axes

|  | B64C 3/44 |
· · | Varying camber

|  | B64C 3/46 |
· · · | by inflatable elements

|  | B64C 3/48 |
· · · | by relatively-movable parts of wing structures

|  | B64C 3/50 |
· · · | by leading or trailing edge flaps (ailerons Fulltext... Hierarchy... Expanded...B64C 9/00)

|  | B64C 3/52 |
· · | Warping

|  | B64C 3/54 |
· · | Varying in area (flaps extendable to increase camber Fulltext... Hierarchy... Expanded...B64C 3/44)

|  | B64C 3/56 |
· · | Folding or collapsing to reduce overall dimensions of aircraft

|  | B64C 3/58 |
· | provided with fences or spoilers (adjustable for control purposes Fulltext... Hierarchy... Expanded...B64C 9/00)

|  | B64C 5/00 |
Stabilising surfaces (attaching stabilising surfaces to fuselage Fulltext... Hierarchy... Expanded...B64C 1/26)

|  | B64C 5/02 |
· | Tailplanes (fins Fulltext... Hierarchy... Expanded...B64C 5/06)

|  | B64C 5/04 |
· | Noseplanes

|  | B64C 5/06 |
· | Fins (specially for wings Fulltext... Hierarchy... Expanded...B64C 5/08)

|  | B64C 5/08 |
· | mounted on, or supported by, wings

|  | B64C 5/10 |
· | adjustable

|  | B64C 5/12 |
· · | for retraction against or within fuselage or nacelle

|  | B64C 5/14 |
· · | Varying angle of sweep

|  | B64C 5/16 |
· · | about spanwise axes

|  | B64C 5/18 |
· · | in area (attaching stabilising surfaces to fuselage Fulltext... Hierarchy... Expanded...B64C 1/26)

|  | B64C 7/00 |
Structures or fairings not otherwise provided for

|  | B64C 7/02 |
· | Nacelles

|  | B64C 9/00 |
Adjustable control surfaces or members, e.g. rudders (trimming stabilising surfaces Fulltext... Hierarchy... Expanded...B64C 5/10)

|  | B64C 9/02 |
· | Mounting or supporting thereof

|  | B64C 9/04 |
· | with compound dependent movements

|  | B64C 9/06 |
· | with two or more independent movements

|  | B64C 9/08 |
· | bodily displaceable (varying camber of wings Fulltext... Hierarchy... Expanded...B64C 3/44)

|  | B64C 9/10 |
· | one surface adjusted by movement of another, e.g. servo tabs (Fulltext... Hierarchy... Expanded...B64C 9/04 takes precedence; adjusting surfaces of different type or function Fulltext... Hierarchy... Expanded...B64C 9/12)

|  | B64C 9/12 |
· | surfaces of different type or function being simultaneously adjusted

|  | B64C 9/14 |
· | forming slots (boundary-layer control Fulltext... Hierarchy... Expanded...B64C 21/00)

|  | B64C 9/16 |
· · | at the rear of the wing

|  | B64C 9/18 |
· · · | by single flaps

|  | B64C 9/20 |
· · · | by multiple flaps

|  | B64C 9/22 |
· · | at the front of the wing

|  | B64C 9/24 |
· · · | by single flap

|  | B64C 9/26 |
· · · | by multiple flaps

|  | B64C 9/28 |
· · | by flaps at both the front and rear of the wing operating in unison

|  | B64C 9/30 |
· | Balancing hinged surfaces, e.g. dynamically

|  | B64C 9/32 |
· | Air braking surfaces (braking by parachutes Fulltext... Hierarchy... Expanded...B64D 17/80)

|  | B64C 9/34 |
· | collapsing or retracting against or within other surfaces or other members

|  | B64C 9/36 |
· · | the members being fuselages or nacelles

|  | B64C 9/38 |
· | Jet flaps

|  | B64C 11/00 |
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft (rotors specially adapted for rotorcraft Fulltext... Hierarchy... Expanded...B64C 27/32)

|  | B64C 11/02 |
· | Hub construction

|  | B64C 11/04 |
· · | Blade mountings

|  | B64C 11/06 |
· · · | for variable-pitch blades

|  | B64C 11/08 |
· · · | for non-adjustable blades

|  | B64C 11/10 |
· · · · | rigid

|  | B64C 11/12 |
· · · · | flexible

|  | B64C 11/14 |
· · | Spinners

|  | B64C 11/16 |
· | Blades

|  | B64C 11/18 |
· · | Aerodynamic features

|  | B64C 11/20 |
· · | Constructional features

|  | B64C 11/22 |
· · · | Solid blades

|  | B64C 11/24 |
· · · | Hollow blades

|  | B64C 11/26 |
· · · | Fabricated blades

|  | B64C 11/28 |
· · · | Collapsible or foldable blades

|  | B64C 11/30 |
· | Blade pitch-changing mechanisms

|  | B64C 11/32 |
· · | mechanical

|  | B64C 11/34 |
· · · | automatic

|  | B64C 11/36 |
· · · | non-automatic

|  | B64C 11/38 |
· · | fluid, e.g. hydraulic

|  | B64C 11/40 |
· · · | automatic

|  | B64C 11/42 |
· · · | non-automatic

|  | B64C 11/44 |
· · | electric

|  | B64C 11/46 |
· | Arrangements of, or constructional features peculiar to, multiple propellers

|  | B64C 11/48 |
· · | Units of two or more coaxial propellers

|  | B64C 11/50 |
· · | Phase synchronisation between multiple propellers

|  | B64C 13/00 |
Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers

|  | B64C 13/02 |
· | Initiating means

|  | B64C 13/04 |
· · | actuated personally

|  | B64C 13/06 |
· · · | adjustable to suit individual persons

|  | B64C 13/08 |
· · · | Trimming zero positions

|  | B64C 13/10 |
· · · | comprising warning devices

|  | B64C 13/12 |
· · · | Dual control apparatus

|  | B64C 13/14 |
· · · | lockable (locking in position to suit individual persons Fulltext... Hierarchy... Expanded...B64C 13/06)

|  | B64C 13/16 |
· · | actuated automatically, e.g. responsive to gust detectors

|  | B64C 13/18 |
· · · | using automatic pilot

|  | B64C 13/20 |
· · · | using radiated signals

|  | B64C 13/22 |
· · · | readily revertible to personal control

|  | B64C 13/24 |
· | Transmitting means

|  | B64C 13/26 |
· · | without power amplification or where power amplification is irrelevant

|  | B64C 13/28 |
· · · | mechanical

|  | B64C 13/30 |
· · · · | using cable, chain, or rod mechanisms

|  | B64C 13/32 |
· · · · | using cam mechanisms

|  | B64C 13/34 |
· · · · | using toothed gearing

|  | B64C 13/36 |
· · · | fluid

|  | B64C 13/38 |
· · | with power amplification

|  | B64C 13/40 |
· · · | using fluid pressure

|  | B64C 13/42 |
· · · · | having duplication or stand-by provisions

|  | B64C 13/44 |
· · · · | overriding of personal controls; with automatic return to inoperative position

|  | B64C 13/46 |
· · · · | with artificial feel

|  | B64C 13/48 |
· · · · | characterised by the fluid being gaseous

|  | B64C 13/50 |
· · · | using electrical energy

|  | B64C 15/00 |
Attitude, flight direction, or altitude control by jet reaction

|  | B64C 15/02 |
· | the jets being propulsion jets

|  | B64C 15/04 |
· · | the jet-stream being deflected

|  | B64C 15/06 |
· · · | by means of movable elements, e.g. flaps

|  | B64C 15/08 |
· · · · | the elements being adjustable nozzles

|  | B64C 15/10 |
· · · | by means of additional jets

|  | B64C 15/12 |
· · | the power plant being tiltable

|  | B64C 15/14 |
· | the jets being other than main propulsion jets (jet flaps Fulltext... Hierarchy... Expanded...B64C 9/38)

|  | B64C 17/00 |
Aircraft stabilisation not otherwise provided for

|  | B64C 17/02 |
· | by gravity or inertia-actuated apparatus

|  | B64C 17/04 |
· · | by pendular bodies

|  | B64C 17/06 |
· · | by gyroscopic apparatus (automatic-pilot control Fulltext... Hierarchy... Expanded...B64C 13/18)

|  | B64C 17/08 |
· | by ballast supply or discharge (for lighter-than-air aircraft Fulltext... Hierarchy... Expanded...B64B)

|  | B64C 17/10 |
· | Transferring fuel to adjust trim

|  | B64C 19/00 |
Aircraft control not otherwise provided for

|  | B64C 19/02 |
· | Conjoint controls

|  | B64C 21/00 - B64C 23/00 |
Influencing air-flow over aircraft surfaces, not otherwise provided for

|  | B64C 21/00 |
Influencing air-flow over aircraft surfaces by affecting boundary-layer flow (boundary-layer control in general Fulltext... Hierarchy... Expanded...F15D)

|  | B64C 21/02 |
· | by use of slot, ducts, porous areas, or the like

|  | B64C 21/04 |
· · | for blowing (Fulltext... Hierarchy... Expanded...B64C 21/08 takes precedence)

|  | B64C 21/06 |
· · | for sucking (Fulltext... Hierarchy... Expanded...B64C 21/08 takes precedence)

|  | B64C 21/08 |
· · | adjustable

|  | B64C 21/10 |
· | using other surface properties, e.g. roughness

|  | B64C 23/00 |
Influencing air-flow over aircraft surfaces, not otherwise provided for

|  | B64C 23/02 |
· | by means of rotating members of cylindrical or similar form

|  | B64C 23/04 |
· | by generating shock waves

|  | B64C 23/06 |
· | by generating vortices

|  | B64C 23/08 |
· | using Magnus effect

|  | B64C 25/00 |
Alighting gear (air-cushion alighting gear Fulltext... Hierarchy... Expanded...B60V 3/08)

|  | B64C 25/02 |
· | Undercarriages

|  | B64C 25/04 |
· · | Arrangement or disposition on aircraft

|  | B64C 25/06 |
· · | fixed

|  | B64C 25/08 |
· · | non-fixed, e.g. jettisonable

|  | B64C 25/10 |
· · · | retractable, foldable, or the like

|  | B64C 25/12 |
· · · · | sideways

|  | B64C 25/14 |
· · · · | fore-and-aft

|  | B64C 25/16 |
· · · · | Fairings movable in conjunction with undercarriage elements

|  | B64C 25/18 |
· · · · | Operating mechanisms

|  | B64C 25/20 |
· · · · · | mechanical

|  | B64C 25/22 |
· · · · · | fluid

|  | B64C 25/24 |
· · · · · | electric

|  | B64C 25/26 |
· · · · · | Control or locking systems therefor

|  | B64C 25/28 |
· · · · · · | with indicating or warning devices

|  | B64C 25/30 |
· · · · · · | emergency actuated

|  | B64C 25/32 |
· | characterised by the ground or like engaging elements (arrester hooks Fulltext... Hierarchy... Expanded...B64C 25/68)

|  | B64C 25/34 |
· · | wheeled type, e.g. multi-wheeled bogies

|  | B64C 25/36 |
· · · | Arrangements or adaptations of wheels, tyres, or axles in general (construction of wheels or axles Fulltext... Hierarchy... Expanded...B60B; construction of tyres in general Fulltext... Hierarchy... Expanded...B60C)

|  | B64C 25/38 |
· · | Endless-track type

|  | B64C 25/40 |
· · | the elements being rotated before touch-down

|  | B64C 25/42 |
· · | Arrangements or adaptations of brakes

|  | B64C 25/44 |
· · · | Actuating mechanisms

|  | B64C 25/46 |
· · · · | Brake regulators for preventing skidding or aircraft somersaulting

|  | B64C 25/48 |
· · · · | differentially operated for steering purposes

|  | B64C 25/50 |
· · | Steerable undercarriages; Shimmy-damping (steering devices applicable to land vehicles Fulltext... Hierarchy... Expanded...B62D)

|  | B64C 25/52 |
· · | Skis or runners

|  | B64C 25/54 |
· · | Floats

|  | B64C 25/56 |
· · · | inflatable

|  | B64C 25/58 |
· · | Arrangements or adaptations of shock-absorbers or springs (shimmy-dampers Fulltext... Hierarchy... Expanded...B64C 25/50; vehicle suspension arrangements in general Fulltext... Hierarchy... Expanded...B60G; shock-absorbers per se Fulltext... Hierarchy... Expanded...F16F)

|  | B64C 25/60 |
· · · | Oleo legs

|  | B64C 25/62 |
· · · | Spring shock-absorbers; Springs

|  | B64C 25/64 |
· · · · | using rubber or like elements

|  | B64C 25/66 |
· · | Convertible alighting gear; Combinations of different kinds of ground or like engaging elements

|  | B64C 25/68 |
· | Arrester hooks (arresting gear, e.g. on aircraft carriers Fulltext... Hierarchy... Expanded...B64F)

|  | B64C 27/00 - B64C 39/00 |
Aircraft kinds and components not otherwise provided for

|  | B64C 27/00 |
Rotorcraft; Rotors peculiar thereto (alighting gear Fulltext... Hierarchy... Expanded...B64C 25/00)

|  | B64C 27/02 |
· | Gyroplanes

|  | B64C 27/04 |
· | Helicopters

|  | B64C 27/06 |
· · | with single rotor

|  | B64C 27/08 |
· · | with two or more rotors

|  | B64C 27/10 |
· · · | arranged coaxially

|  | B64C 27/12 |
· · | Rotor drives

|  | B64C 27/14 |
· · · | Direct drive between power plant and rotor hub

|  | B64C 27/16 |
· · · | Drive of rotors by means, e.g. propellers, mounted on rotor blades

|  | B64C 27/18 |
· · · · | the means being jet-reaction apparatus

|  | B64C 27/20 |
· | Rotorcraft characterised by having shrouded rotors, e.g. flying platforms

|  | B64C 27/22 |
· | Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft

|  | B64C 27/24 |
· · | with rotor blades fixed in flight to act as lifting surfaces

|  | B64C 27/26 |
· · | characterised by provision of fixed wings

|  | B64C 27/28 |
· · | with forward-propulsion propellers pivotable to act as lifting rotors

|  | B64C 27/30 |
· · | with provision for reducing drag of inoperative rotor

|  | B64C 27/32 |
· | Rotors (features common to rotors and propellers Fulltext... Hierarchy... Expanded...B64C 11/00)

|  | B64C 27/34 |
· · | rigid

|  | B64C 27/36 |
· · | of see-saw type

|  | B64C 27/38 |
· · | having provision for flapping or lag-lead movements of blades

|  | B64C 27/40 |
· · · | characterised by flapping movements (Fulltext... Hierarchy... Expanded...B64C 27/44 takes precedence)

|  | B64C 27/42 |
· · · | characterised by lag-lead movements (Fulltext... Hierarchy... Expanded...B64C 27/44 takes precedence)

|  | B64C 27/44 |
· · · | producing simultaneous change of pitch

|  | B64C 27/46 |
· · | Blades

|  | B64C 27/48 |
· · · | Root attachment to rotor head

|  | B64C 27/50 |
· · | Blades foldable to facilitate stowage of aircraft

|  | B64C 27/52 |
· | Tilting of rotor bodily relative to fuselage (of see-saw type construction Fulltext... Hierarchy... Expanded...B64C 27/36)

|  | B64C 27/54 |
· | Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement

|  | B64C 27/56 |
· · | Initiating means, e.g. actuated personally

|  | B64C 27/58 |
· · | Transmitting means

|  | B64C 27/60 |
· · · | without power amplification

|  | B64C 27/62 |
· · · | with power amplification

|  | B64C 27/64 |
· · · · | using fluid pressure

|  | B64C 27/66 |
· · · · · | under automatic control

|  | B64C 27/68 |
· · · · | using electrical energy

|  | B64C 27/70 |
· · · · · | under automatic control

|  | B64C 27/72 |
· · | Means acting on blades

|  | B64C 27/74 |
· · · | for adjusting cyclic pitch

|  | B64C 27/76 |
· · · | for adjusting collective pitch

|  | B64C 27/78 |
· · | in association with pitch adjustment of blades of anti-torque rotor

|  | B64C 27/80 |
· · | for differential adjustment of blade pitch between two or more lifting rotors

|  | B64C 27/82 |
· | characterised by the provision of an auxiliary rotor or fluid-jet device for counter-balancing lifting-rotor torque or changing direction of rotorcraft

|  | B64C 29/00 |
Aircraft capable of landing or taking-off vertically (attitude, flight direction, or altitude control by jet reaction Fulltext... Hierarchy... Expanded...B64C 15/00; rotorcraft Fulltext... Hierarchy... Expanded...B64C 27/00; air-cushion vehicles Fulltext... Hierarchy... Expanded...B60V)

|  | B64C 29/02 |
· | having its flight directional axis vertical when grounded

|  | B64C 29/04 |
· · | characterised by jet-reaction propulsion

|  | B64C 31/00 |
Non-power-driven aircraft

|  | B64C 31/02 |
· | Gliders; Sailplanes

|  | B64C 31/04 |
· | Man-power aircraft (ornithopters Fulltext... Hierarchy... Expanded...B64C 33/00)

|  | B64C 31/06 |
· | Kites (toy aspects Fulltext... Hierarchy... Expanded...A63H 27/08; towed targets Fulltext... Hierarchy... Expanded...F41J)

|  | B64C 33/00 |
Ornithopters

|  | B64C 33/02 |
· | Wings; Actuating mechanisms therefor

|  | B64C 35/00 |
Flying-boats; Seaplanes (fuselages constructed as flying-boat hulls Fulltext... Hierarchy... Expanded...B64C 1/04; other alighting-gear aspects Fulltext... Hierarchy... Expanded...B64C 25/00)

|  | B64C 37/00 |
Convertible aircraft (vehicles capable of travelling in or on different media Fulltext... Hierarchy... Expanded...B60F)

|  | B64C 37/02 |
· | Flying units formed by separate aircraft (towing, air-refuelling, or aircraft-carrying aircraft Fulltext... Hierarchy... Expanded...B64D)

|  | B64C 39/00 |
Other aircraft

|  | B64C 39/02 |
· | characterised by special use