| B | SK | PERFORMING OPERATIONS; TRANSPORTING |
| B64 | KL | AIRCRAFT; AVIATION; COSMONAUTICS |
| B64F | UKL | GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS |
| B64F 1/00 | HGR | Ground or aircraft-carrier-deck installations (specially adapted for captive aircraft B64F 3/00; aircraft-carriers B63; fog-dispersal installations E01H; wind tunnels G01M; grounded flight trainers G09B) |
| B64F 1/02 | UGR1 | | . | Arresting gear; Liquid barriers |
|
| B64F 1/04 | UGR1 | | . | Launching or towing gear (railway aspects B61; aircraft towing aircraft B64D 3/00; ammunition launching gear F41F) |
|
| B64F 1/06 | UGR2 | |
| B64F 1/08 | UGR2 | |
| B64F 1/10 | UGR2 | | . . | using self-propelled vehicles |
|
| B64F 1/12 | UGR1 | |
| B64F 1/14 | UGR2 | | . . | Towers or masts for mooring airships or balloons (mooring attachments of lighter-than-air aircraft B64B 1/66; building aspects E04H 6/00 , E04H 12/00) |
|
| B64F 1/16 | UGR2 | | . . | Pickets or ground anchors; Wheel chocks |
|
| B64F 1/18 | UGR1 | | . | Visual or acoustic landing aids (optical or acoustic signalling in general G08) |
|
| B64F 1/20 | UGR2 | | . . | Arrangement of optical beacons |
|
| B64F 1/22 | UGR1 | | . | installed for handling aircraft |
|
| B64F 1/24 | UGR2 | | . . | Adaptations of turntables |
|
| B64F 1/26 | UGR1 | | . | for reducing engine or jet noise; Protecting airports from jet erosion |
|
| B64F 1/28 | UGR1 | | . | Liquid-handling installations specially adapted for fuelling stationary aircraft (liquid handling in general B67) |
|
| B64F 1/30 | UGR1 | | . | for embarking or disembarking passengers |
|
| B64F 1/305 | UGR2 | | . . | Bridges extending between terminal building and aircraft, e.g. telescopic, vertically adjustable [3] |
|
| B64F 1/31 | UGR2 | | . . | Passenger vehicles specially adapted to co-operate, e.g. dock, with aircraft or terminal buildings [3] |
|
| B64F 1/315 | UGR2 | | . . | Mobile stairs (movable stairways in general E04F 11/04) [3] |
|
| B64F 1/32 | UGR1 | |
| B64F 1/34 | UGR1 | | . | for starting propulsion plant |
|
| B64F 1/36 | UGR1 | | . | Other airport installations (construction of, or surfacing for, airfields E01C) |
|
| B64F 3/00 | HGR | Ground installations specially adapted for captive aircraft (railway aspects B61) |
| B64F 3/02 | UGR1 | | . | with means for supplying electricity to aircraft during flight |
|
| B64F 5/00 | HGR | Designing, manufacturing, assembling, cleaning, maintaining, or repairing aircraft, not otherwise provided for |