Engine Startup and PTU sound (Only sound)

[aadneds]

I love the deep startup sound and the HYD PTU :D

[Rwy02]

Always one fucking baby on every flight!!!

[YourNewsUk1]

love it

[noname826]

oh man, i know i have pissed off my neighbors when cranking this up with full bass on my sound system. that part at 1:15 when it sounds like the engines equalise and speed up is just another brilliant sound

[kelan930]

Do you know what that noise was that started at 0:28?

[michakra14]

@kelan930 That's what the vid actually is about - the PTU (Power Transfer Unit).

[TheFSXclips]

@kelan930 Yes its THE PTU

[fsxpilot77]

Just Perfect !

[RomJonno15]

I was at A330-300 Philippine Airline and I heard PTU sound. I thought someone was cleaning up the window!!! :D Where the PTU comes out from?

[ricardosoares2000]

This is a song for my ears ! I love it

Hugs from BRAZIL

[michakra14]

same to me :P

thanx guys

[lucasguillen]

ITS COUGHING!

(my english sukz dont complain :) )

[Cmontgoneryburns]

damn wonderful ! its like sex in my ears ;)

[syriaboy19]

nice record this is iae 2500 engines

[michakra14]

however..thanks ;)

[pilotmustbe]

@syriaboy19 no CFM

[atav]

I think these were CFM 56s maybe

[hellomotosux]

@syriaboy19 LH has CFM-powered A320s

[CngDelta757]

@syriaboy19 Lufthansa Operates CFM-56B Engines. Though I am unsure about A321s?

[michakra14]

@CngDelta757 This defenetly was an A320.

[richygambs321]

@CngDelta757 as i know IAE.

[joey21tribiani]

hey there. I LOVEEEEEE the sound!!!!i wanna fly now. What is PTU???i always wondered what this sound is about. thanks

[michakra14]

hey, thaks..

i don´t really know lots about the PTU..but i think it transfers something to the engines while starting them up

[TehMG]

The A320 has two separate hydraulic systems. The PTU (Power Transfer Unit) is a hydraulic motor-pump that transfers power from one system to the other should there be a pressure difference between the two, it does so without any sharing of fluid between the systems. The systems remain isolated.

Its purpose is to allow one system to operate from the other in the event that one system's engine-driven hydraulic pump isn't working.

[TehMG]

During normal operation the PTU is active when only one engine is running, so you'll hear the PTU quite often at the gate, during startup, and taxi. Sometimes also during take-off and landing as there is high usage of the hydraulic systems.

[Ryanairflieger]

@TehMG In fact it has three, called Blue, Green and Yellow

[eugrizzi]

@TehMG Exactly! Between the Green (1st engine) and Yellow (2nd engine) hydraulic systems. Normally heard during pushback when the first engine is started (and the relative pump) and the second is starting.

[MegaPilotguy]

@TehMG I've heard that the PTU sometimes comes on during takeoff. Is this something that the pilots do or the plane does by itself?

[Nicomurgia]

PTU is an abreviation for Power Transfert Unit. It transfers hydraulic pressure from one motor to another when it fails and has no hydraulic pressure. You can hear during the starting up because the pilots start the motors one by one. You can also hear it when the landing gear is retracted for example, because this action uses a lot of hydraulic power. I love this sound too !!!

[karan89er]

@joey21tribiani its the power transfer unit. transfers hydraulics from one engine to the other.

[cloud1366]

AMAZING sound.

[nd01902]

Never mind, I have been working around airplanes longer than you have been alive! No wonder you know soooo much!

[nd01902]

I work for jetBlue, and fly (commute) on Virgin America and US Airways alot and these are 100% the IAEs...

[michakra14]

NO THEY`RE NOT!!! I was on that flight and it was a Lufthansa A320 from Manchester-Frankfurt and Lufthansa only has A320s with CFM engines!!!

[nd01902]

Amazing... everybody is on every flight people comment on. Well, I have actually worked in aviation for almost 20 years, and have done everything except fly airplanes. I have both A&P ratings and can tell you from the lenght of spool up time, those are not CFMs. It's very difficult to discern engine types from inside MOST airliner cabins, unless seated in certain areas of the cabin. The CFMs spool up alot faster than the IAEs. Go to your airport and see for yourself.

[BlackTwister999]

WoooooooooooHooooooooooooo I was searching about that for long time.....5\5

[jodellstasic]

By 1:16 the engines are already spooling up. I'm guessing that these are IAE V2500s and not CFM56s......based on the sound.

[italianluvah83]

actually i think it sounds more like cfms :-\

[italianluvah83]

actually you may be right. I dont know anymore LOL

[michakra14]

Thank you very much guys...

Those are CFM Engines. It was a Lufthansa A320 and all of them have CFM ones =)

[benzguy200]

simply amazing! thx

[ricardolemke88]

Thanks a lot. I love that sound!!!