Aviation Technical English for aircraft maintenance engineers (Авиационный технический английский язык для студентов-авитехников)

61 The cabins are air conditioned with a three-wheel air cycle environmental control system. Airstairs are optional for the forward cabin, allowing the aircraft to operate at airports with limited facilities. There are two under-floor baggage holds. The rear hold can be fitted with a telescopic baggage conveyor. Engines The aircraft is powered by two CFM International CFM56-7 turbofan engines in wing-mounted engine pods. CFM is a joint venture of General Electric Co. of the US and Snecma of France. The aircraft carries 26,025l of fuel. The aircraft’s auxiliary power unit is the Honeywell 131-9B which provides 90kVA and air start capability. The noise on the ground was reduced by up to 12dB by the installation of a new diffuser duct and silencer on the cooling vent on the auxiliary power unit. New quiet operating fans have been installed on the environmental control system and on the electronics cooling systems. Landing gear The aircraft is equipped with tricycle-type hydraulically operated retractable landing gear. The gear is fitted with oleo-pneumatic shock absorbers designed by Boeing. The main wheels retract inwards with the wheels forming the well seal; the wells have no doors. The main wheels are fitted with Honeywell or Goodrich wheel brakes. The twin nose wheel retracts forward. In April 2008, Boeing completed certification testing of new carbon brakes for the 737 NG. The carbon brakes, designed by Messier-Bugatti of France, provide a weight saving of between 250kg (550lb) and 320kg (700lb), depending on aircraft model, compared to steel brakes. The new brakes will enter production by the end of 2008 and will also be available for retrofit. *https://www.aerospace-technology.com/projects/boeing737_ng/ (05.10.2018).