Landing Gear supports an aeroplane on the ground and absorbs vertical shocks on take off and particularly, landing.The main part is a shock absorbing strut, comprising a piston and cylinder, like a very large bicycle pump.
The cylinder is filled with high pressure nitrogen and hydraulic oil.
The Nitrogen acts as a spring and resists the piston being forced into the cylinder, contracting and expanding in response to external forces.
Movement of the piston in the cylinder forces the hydraulic oil to flow through restricting orifices and slow the movement, removing any violent changes and making the movements comfortable for the passengers.
Typically, there are two or more large units (Main Landing Gears) in the middle of the aircraft, which are capable of supporting the full weight of the Aircraft; and a smaller one; at the front (Nose Landing Gear) basically intended to support the aircraft with its cabin floor horizontal whilst on the ground.
The Nose Landing Gear is a standard two wheel gear assembly, which absorbs take-off and landing forces of the aircraft. The gear also steers the aircraft and supports the weight of the forward section of the aircraft while the aircraft is on the ground. The major components of the NLG are
a) A shock strut with integral axle to attach the wheels and brakes
b) Top and bottom torsion links
c) Steering Actuator fittings
d) Trunnion Mounting components
e) Hydraulic and Electrical systems
Operation
The shock strut is the main part of the nose landing gear assembly; it absorbs the landing forces of the aircraft and transmits the vertical loads to the structure of the aircraft. The trunnion mounting components permit load transfer from shock strut through the trunnion’s to the internal structure of the aircraft.
The torsion links keep the radial alignment of the inner cylinder of the shock strut and the steering collar. The steering actuator fittings attach the rod end of the steering actuators to the steering collar and by hydraulic pressure steer the aircraft.
MAIN LANDING GEAR / WING LANDING GEAR (B747)
The Nose Landing Gear is a standard two wheel gear assembly, which absorbs take-off and landing forces of the aircraft. The gear also steers the aircraft and supports the weight of he forward section of the aircraft while the aircraft is on the ground. The major components of the NLG are
f) A shock strut with integral axle to attach the wheels and brakes
g) Top and bottom torsion links
h) Steering Actuator fittings
i) Trunnion Mounting components
j) Hydraulic and Electrical systems
Operation
The shock strut is the main part of the nose landing gear assembly; it absorbs the landing forces of the aircraft and transmits the vertical loads to the structure of the aircraft. The trunnion mounting components permit load transfer from shock strut through the trunnions to the internal structure of the aircraft.
The torsion links keep the radial alignment of the inner cylinder of the shock strut and the steering collar. The steering actuator fittings attach the rod end of the steering actuators to the steering collar and by hydraulic pressure steer the aircraft.
BODY LANDING GEAR (B747)
Description
The Body Landing Gear comprises of the same major components as the Main Landing Gear and performs the same role.
Operation
One difference is the Body Landing steering provide directional control during towing and taxiing of the airplane. The steering functions through a closed loop electronics system which establishes positions of the body trucks corresponding to a relative position of the nose gear. As the Nose Landing Gear turns in one direction, the body gear turns smaller proportional angles in the other direction. Body gear steering reduces scrubbing effect on the tires while manoeuvring on the ground.
The Body Landing Gears are located and support the fuselage.
Among the companies providing landing gear repair are
SR Technics to provide MRO on Oman Air B737s landing gear
Oman Air signed an agreement with SR Technics to provide maintenance, repair and overhaul services (MRO) on the landing gear assembly on its B737NG fleet.
Abdullah Bin Burham Ba Omar Sr Manager - Planning & Production Control said, “In aviation, the undercarriage or landing gear is the structures (usually wheels) that supports an aircraft and allows it to move across the surface of the Earth when it is not flying. Airplanes require landing gear for taxiing, takeoff, and landing. Aircraft’s landing gear is, of course, essential to safety and requires regular maintenance and repair.”
“Initially the contract will cover six aircraft that will be due at different timings starting from fist quarter of 2009 until the last quarter of 2011. To facilitate the overhaul schedule programme SRT will provide to Oman Air a loan set of landing gear assembly during the phase of the overhaul work. The overhaul work of the landing gears will be carried out at SRT facility located at Dublin Airport, Ireland. It is worth mentioning that this agreement will also provide the necessary training requirements and any other required expertise to Oman Air Engineering personnel to carry out the removal and installation of the lading gears from B737NG fleet,” he further added.
HYDREP - Aircraft Landing Gear, Hydraulics, Wheel and Brake Maintenance
HYDREP is the largest aircraft landing gear and aircraft hydraulic repair station in Europe, specialising in commuter aircraft, business aircraft and helicopters. Our 90 landing gear and hydraulics specialists are working in our 7,000m² facility to provide our customers with the best turn around time at a good price with the highest quality standard.
Since 1991, HYDREP has been providing maintenance, repair and overhaul on aircraft landing gear, hydraulics, wheels and brakes. HYDREP also offers, aircraft landing gear and hydraulics available for loan or standard exchange.
HYDREP is a joint venture between two well-established companies, Messier Services (SAFRAN Group) and Sabena technics (TAT Group).
HYDREP has a complete control of internal processes for all repair and overhaul:
Machining shop (drilling, grinding, boring, honing, milling)
Plating process (cadmium, chromium, shot peening)
Non-Destructive Test (NDT)
Test benches (pneumatic, hydraulic, mechanical)
AIRCAFT LANDING GEAR AND HYDRAULICS MRO
HYDREP provides Maintenance, Repair and Overhaul (MRO) for aircraft landing gear and hydraulics across a broad spectrum of regional and business aircraft, as well as helicopters.
Regional aircraft landing gear and hydraulics MRO:
ATR 42 and 72
Fokker 27, 28, 50, 70, 100
Bombardier CRJ
Embraer 110, 120, 121, 135, 145
Dornier 328 and 328 JET
Business aircraft landing gear and hydraulics MRO:
Dassalt Falcon 10, 100, 20, 200, 50, 50EX, 900, 900EX, 900EASY, 2000, 2000EX
Bombardier Challenger 601 and 604
Corvette
Others:
CASA CN235
MD 80 series
Socata Epsilon
Aerospatiale Nord 262
HYDREP also supplies helicopter landing gear and hydraulics MRO for Eurocopter Dauphin, Puma, Super Puma, Panther, Cougar, Tigre, Alouette and S92.
Wheel and brake MRO capability can also be provided for all types of aircraft.
EXCHANGE AND LOAN FOR AIRCRAFT LANDING GEAR, HYDRAULICS, BRAKES AND WHEELS
Aircraft landing gear, hydraulics, brakes and wheels are available from HYDREP on exchange or loan basis. HYDREP has spent many years investing in equipment to offer its customers rental and exchange units.
Aircraft landing gear, actuators, braces, brakes and wheels are available on loan and exchange basis for:
ATR 42 and 72
Dassault Falcon
Bombardier CRJ
Fokker 28 and 100
Eurocopter Dauphin, Puma, Super Puma and Alouette
HYDREP
Aeroport de Dinard, Pleurtuit, Saint Malo
Batiment 20
BP 90154
35801 Dinard Cedex
France
Contact: Jean-Louis Haas
Tel: +33 2 99 82 79 79
Fax: +33 2 99 82 79 97
Email: jean-louis.haas@hydrep.com
Email: pascal.reverseau@hydrep.com
URL: www.hydrep.com
HYDREP provides MRO for landing gear and hydraulics across a broad spectrum of regional and business aircraft.
Wheel and brake MRO capability can be provided for all types of aircraft.
Landing gear, hydraulics, brakes and wheels are available from HYDREP on exchange or loan basis.
Aerotek - Aircraft Wheel-Hub Repairs, Landing Gear and Hydraulic Components
Aerotek has a worldwide reputation for top quality, repair and overhaul of landing gear, hydraulic components and wheel reworks, on time, at very attractive prices. This has lead to Aerotek receiving a multi-million pound contract from an overseas government to overhaul their regional commuter aircrafts' landing gear for the next ten years.
Aerotek's services include AOG component and gear repairs, on-site servicing repairs, ad-hoc component testing and inspection, and NDT.
Aerotek is the major wheel-hub repair machining shop in the UK: we repair most aircraft wheels, including all Boeing and Airbus wheels.
These repairs include manufacturing and fitting bearing cup liners, and bushing of both ends of brake torque bar holes. Foreign body damage to the external surface of the bearing housing is a specialist machining process.
Aircraft wheel types we currently repair include:
Airbus A300s, A310s, A320s, A330s, A340s and A340 600s
Boeing 737s, 747s, 757s, 767s, 777s and 787s
Embraer 145s and 195s
Fokker 27s, 50s and 100s
BAe 146s
AVRO RJs and CJs
Aerotek's highly skilled and experienced staff have developed life-prolonging processes for all aircraft wheel hubs, by carrying out specialist machining repairs.
We have a full and comprehensive machine shop that provides turning, milling, grinding, horizontal and vertical boring, and honing services.
We also provide painting, paint stripping, shot peening, dalic plating and alochrome services.
We have a range of services available at our testing facilities, including hydraulic test rigs (skydrol and shell 41), pneumatic test rigs, mechanical testing, non-destructive testing, and dye pen and mag particle testing.
These are the regional and commuter aircraft, and landing gear and hydraulic components, we currently focus on:
Fokker 27s, 28s, 50s, 70s and 100s
Embraer 110s and 120s
Twin Otter DHC 6s
Piaggio 180s
Shorts 330s, 360s and C23Bs
BAe 146s
Boeing 737s
APPROVALS AND ACCREDITATIONS
Since 1994, Aerotek has been awarded the following accreditations:
EASA 145
FAR 145
TCCB of Canada
EN ISO 9001:2000
Two of the biggest wheel and brake shops in the world are already sending all their repair work to Aerotek. A third major shop intends to send its repair hubs to us in the very near future.
Aerotek exports 70% of its production, to the USA, Canada, Australia, Scandinavia and Italy.
Aerotek Aviation Engineering Limited
10, the Alpha Centre
Upton Road
Poole
Dorset
BH17 7AG
United Kingdom
Contact: Eric May
Tel: +44 1202 665551
Fax: +44 1202 665181
Email: eric@aerotekaviation.co.uk
URL: www.aerotek-aviation.co.uk