Table of Contents
What happens if a plane loses all engines?
If both engines fail, the aeroplane is no longer being pushed forwards through thrust, therefore in order to keep the air flowing over the wings, the aircraft must exchange energy through losing altitude in order to maintain forward airspeed.
Does the 787 start both engines at the same time?
In various Youtube videos, e.g. this one, one can see that the Boeing 787 is capable of a parallel engine start (both engines are started at the same time).
Does the APU stay on during flight?
In most cases, the APU is shut down before takeoff and reignited when the aircraft clears the runway after landing. While most of an APU’s active service life occurs as the aircraft sits on the ground, in some instances the APU is used as an emergency electrical power source while the aircraft is airborne.
How does an APU start?
APUs are like small jet engines, small enough to be started electrically. So you would use the power of the battery or an electric ground power cart to spin up the APU by its electric starter motor, and then introduce fuel into it once its spinning fast enough, just like a jet engine is started.
Does the 787 have slats?
The 787 utilizes an electro-thermal ice protection scheme, in which several heating blankets are bonded to the interior of the protected slat leading edges. The heating blankets may then be energized simultaneously for anti-icing protection or sequentially for deicing protection to heat the wing leading edge.
Do planes turn off their Apu when they fly?
Yes. Most aircraft switch off their APUs in flight. Also, APU is not mandatory for ground operations if external (Ground) power unit is available. Engine start can be done with an external unit or (in some cases) battery.
Is it possible to run the car without the APU?
Yes it is. Without the APU the airconditioning and electronics also won’t work when the engines are shut down, so a ground power unit is connected to provide the electricity and enough compressed air to run the air-conditioning. Starting the engines will need a air start unit to start one of the engines using compressed air provided by hoses.
What is the Bleed on the APU of a car?
Normally the engines are always started using the APU with its bleed providing air for the air starter motor. So, in normal operations, cross bleed is set at AUTO, APU bleed is turned on and both the engines are started with the help of the APU.
What is the after start flow of the A320?
Below is the after start flow of the A320. The green shows the flow of the pilot who starts the engines. As you can see, once the engine mode selector is set to norm, APU is shut down. The procedure you are talking of is called a cross bleed start which is used when the APU is inoperative for the flight.