# US 2021/0276699 A1 · Tool for assisting with the adjustment of a maneuvering mechanism of a main landing gear

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- Number: US 2021/0276699 A1
- Document ID: US20210276699A1
- Status: Published application
- Kind: A1
- Application number: 17/190,595
- Filed: 2021-03-03
- Published: 2021-09-09
- Earliest claimed: 2020-03-05
- Assignees: Airbus Operations GmbH
- Applicants: Airbus Operations SAS
- Inventors: Antoine ROUILLER; Jérémy BONJEAN; Alain SEGART
- Web page: https://patentgrep.com/patent/US20210276699A1

## CPC

- B64C 25/28: with indicating or warning devices
- B64F 5/60: Testing or inspecting aircraft components or systems
- G01B 5/0025: {Measuring of vehicle parts (G01B5/003 takes precedence)}
- G01B 11/026: {by measuring distance between sensor and object (G01B11/0608 takes precedence)}
- G01B 17/00: Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- B64C 25/10: retractable, foldable, or the like
- B64C 25/34: wheeled type, e.g. multi-wheeled bogies
- B64C: AEROPLANES; HELICOPTERS
- B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

An adjustment tool for adjusting a maneuvering mechanism of a main landing gear of an aircraft, the landing gear having a plurality of wheels. The tool includes a telemeter, a locking system for locking the telemeter on the external face of a wheel, a wireless communication unit that is connected to the telemeter and makes it possible, when the tool is being used, to connect the telemeter with a control device provided with a display screen.

## Claims

### Claim 1

An adjustment tool for adjusting a maneuvering mechanism of a retractable main landing gear of an aircraft, the landing gear having a plurality of wheels, wherein the tool comprises:
a telemeter,
a locking system for locking the telemeter on the external face of one of said plurality of wheels, and
a wireless communication unit connected to the telemeter and allowing, when the tool is being used, a connection of the telemeter with a control device provided with a display screen,
the locking system for locking the telemeter comprising:
a shoe,
an attachment system that is secured to the shoe so as to, when it is locked, fasten the shoe to a hub of the wheel,
wherein the shoe is shaped as a hollow cylinder with an inner diameter that is slightly larger than an outer diameter of the hub of the wheel, the shoe comprising an open face so that the shoe can cover the hub,
the attachment system being arranged at the open face of the shoe,
the telemeter and the communication unit being incorporated in a chassis, the chassis having a cylindrical shape.

### Claim 2 (depends on 1)

A method for adjusting a main landing gear of an aircraft by means of the adjustment tool according to claim 1, the landing gear comprising a strut that is fastened inside a landing gear bay and mounted so as to be able to pivot about a pivot axis that is parallel to the longitudinal axis of a fuselage of the aircraft, the strut bearing a plurality of wheels, the landing gear also comprising a maneuvering mechanism for moving the landing gear between an extended position in which the strut of the landing gear is substantially perpendicular to the longitudinal axis of the aircraft, and a retracted position in which the landing gear is entirely folded into the landing gear bay, the method comprising the following successive steps, which are implemented from a position of the main landing gear that is between the extended position and the retracted position:
selecting a wheel of the main landing gear to receive the telemeter, the selected wheel having its external face facing a top wall of the bay of the main landing gear when the main landing gear is in the retracted position;
locking the telemeter to the selected wheel via the locking system for locking the telemeter;
activating the telemeter and placing the telemeter in communication with a control device used by an operator remote from the wheel;
taking measurements by the telemeter as the main landing gear moves towards the retracted position, and transmitting the measurements to the control device and displaying the measurements on a control screen;
adjusting the maneuvering mechanism of the main landing gear, initiated when a distance measured during the measurement step is smaller than a predetermined value, and the movement of the main landing gear is stopped, so that a position of stoppage corresponds to the retracted position of the landing gear.