What is the sawing noise on a plane?
The PTU has been described as a “dog barking,” “a NASCAR tire lug gun” or “sawing.” The noise is the normal sound the PTU makes when it powers one of the hydraulic systems. During taxi in, one engine is often shut down causing the PTU to power the opposite hydraulic system.
Why are aircraft engines so loud?
Jet engines produce noise in different ways, but mainly it comes from the high-speed exhaust stream that leaves the nozzle at the rear of the engine. And planes are loudest when they move slowly, such as at takeoff or at landing. The turbulence produced from this instability becomes the roar of the engine.
What causes descending aircraft to make a noise like a…?
Often the pitch will descend during a half dozen seconds, stay constant for a dozen seconds, and then rise again until the sound disappears. My best guess is that the sound is caused by the pilot lowering the wheels during their descent, and that it only happens on certain models of aircraft.
Why do I hear jet engine in the sky?
Today on November 4, 2019, from about 5:20 am to 5:35 am Eastern, I heard a VERY loud jet-like noise, a constant engine sound. But there was no jet in the sky. I thought maybe there was an explosion at the plant we live near, but I haven’t seen nor heard sirens or anything. But this noise went on for a constant 15 minutes.
When is strange jet like Sky sounds but no planes?
This year of 2019 on August 14th, I did an Earthfiles YouTube Channel broadcast, followed by an August 16th Earthfiles news update, “Strange Jet-like Sky Sounds, But No Planes?” That’s when I reported about high strangeness jet-like sounds heard by a current Boeing Company Production Facility employee in Everett, Washington.
What causes the whine of a jet engine?
Whines are often forward directed radiation and are largely acoustics from the intake, and most specifically from fans on turbofan engines. There is a plethora of literature on A320 engine whine and solutions with different engines.