What APU is on the 737 Max?
Honeywell 131-9
APU. The MAX APU is still a Honeywell 131-9[B] but is updated to series 41 which has various minor improvements such as improved starting reliability.
How much power does an APU produce?
APU Power Requirements of Major Aircraft Classes The output power range of APUs is between 10 kW and 300 kW, with bleed supplied requiring additional turbine power.
Is B737 Max Fly By Wire?
However, the 737 MAX extended spoilers are fly-by-wire controlled. Most of the systems are carried from the 737NG to allow for a short differences-training course to upgrade flight crews. In addition to the Speed Trim System (STS), the automatic stabilizer control system has been enhanced to include MCAS.
Does the APU provide thrust?
The APU is a turbine engine that sits in the tail of the aircraft. It provides no thrust. Like any jet engine, it takes in air, compresses it, adds a fuel mixture and ignites it. Once started, the APU powers both an electrical generator and an air compressor, Plumb explained.
Does APU provide hydraulic power?
The APU often provides only electic and pneumatic power, but no hydraulic power. Hydraulic power can in this case e.g. be provided from an electric motor driven pump. Secondary power is used to drive all aircraft systems (avionics and utility systems).
Can an APU provide thrust?
Does the 787 have an APU?
The APS5000 APU was designed exclusively for the Boeing 787 Dreamliner. The APU comprises a single-shaft, fixedspeed, high-pressure ratio core driving a load compressor that provides bleed air for cabin conditioning and main engine starting, concurrent with 90kVA of electrical power.
What causes APU failure?
Common causes of APU failure include overheating, loss of oil pressure, excessive load, and just plain mechanical breakdown. The decision as to whether to dispatch a large airplane without an APU would be an economic one primarily.
How does the vortex generator work on the APU?
The low pressure pulls outside air through the eductor inlet duct to the APU compartment. The cooling air then goes through the oil cooler and out the APU exhaust duct below, eliminating the need for a separate cooling air vent or fan. The protrusion on the lower right hand side of the photo is the vortex generator on the APU air inlet door.
How does the 737 NG Apu work?
The 737 NG APU is recognisable by the “eductor” cooling air inlet above the exhaust. This and a redesigned silencer make the NG APU 12dB quieter than the Classics. The eductor works by using the high speed flow of the APU exhaust which forms a low pressure area.
Where is the vortex generator on a Boeing 737?
An example of the vortex generator used aboard the current generation of the Boeing 737 family is pictured below. One generator is located on the inboard side of each nacelle. These devices can be seen aboard the 737-600, 737-700, and 737-900 in addition to the 737-800.
What is the power source of the 737 MAX-500?
It’s electrical power source is the battery, many series -500 aircraft have an extra, dedicated APU battery to preserve main battery usage. There are many different APUs available for the 737.