What is this sound? ERJ-135/145

[RyanB]

To the ERJ pilots that we have on here, what is the high pitched squealing sound that’s heard from 2:20 to 3:30? I hear it every time I fly on one of these birds.

 

[OverTQ]

I believe you're hearing an electric hydraulic pump running.

When taxiing on one engine, an electric pump will engage to make up for not having both engine-driven pumps running.

 

[RyanB]

I believe you're hearing an electric hydraulic pump running.

When taxiing on one engine, and electric pump will engage to make up for not having both engine-driven pumps running.

That makes sense! It seems to cut off once they get the other engine fired up. I assumed it was something along those lines. Thanks!

 

[mscard88]

Blender in the cockpit, making their smoothies.

 

[mtuomi]

Google WSCOD.

 

[RyanB]

Google WSCOD.

Hahahaha! Thank you!

 

[RyanB]

Blender in the cockpit, making their smoothies.

Kinda sounds like someone is getting a root canal.

 

[Lachlan]

I think the sound you're hearing is this:

 

[RyanB]

I think the sound you're hearing is this:

ya gotta do better than that....

 

[Ted]

I think the sound you're hearing is this:

https://www.google.com/amp/www.nyda...rolling-isis-article-1.2445685?outputType=amp

 

[Lachlan]

ya gotta do better than that....

I thought "it's the thought that counts?"