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MD-80 Cockpit Noises  
User currently offlineSpeedracer1407 From United States of America, joined Dec 2004, 333 posts, RR: 0
Posted (7 years 10 months 1 week 4 days 15 hours ago) and read 9543 times:

I must admit that, because I'm a dork, I often look for good cockpit video footage. As a result, I have quite a few that I've downloaded from Flightlevel350.com. I'd like to post links to the videos that have inspired the folowing questions, but alas, FL350's search engine sucks, and I'm lazy. Hopefully, my descriptions will be enough.

The MD-80 cockpit seems to emit a riot of noises during takeoff and landing phases, much more so than other types based on video footage.

On takeoff, I often hear a loud, seemingly irritating buzz tone during the initial climb phase. I assumed this was the trim horn (or whatever its official name is), which imforms the pilots of extended use of trim, thus alerting the crew to potential runaway trim conditions. But I wouldn't know, so I'm curious as to whether or not I'm right.

On landing, I notice two unique sounds.

First is a tone that usually warbles its way from low to high pitch seconds before touchdown. The tone ends upon initial touchdown, and thus, I have always assumed it was some sort of aural indicator of the Main landing gear's proximity to the ground.

Second, in the istant of touchdown, there's a loud sound that could be described as either a particularly noisy servo noise, or a badly replicated tire screach noise. I have assumed this was a noise indicating automatic ground spoiler deployment.

I'd be nice if my assumptions were correct, but even more fun if they weren't.
Thanks for any replies.

O


Dassault Mercure: the plane that has Boeing and Airbus shaking in their boots.
6 replies: All unread, jump to last
 
User currently offlineOyKIE From Norway, joined Jan 2006, 2727 posts, RR: 4
Reply 1, posted (7 years 10 months 1 week 4 days 12 hours ago) and read 9520 times:

I have just been riding in DC-9, MD-80/90 and 737 cockpits, but my impression is that the MD-80/90 is the most comfortable planes to sit in the cockpit when it comes to noise. You almost do not hear the engines, and I believe the nose on the MD-80 has better aerodynamics, because the noise from the wind seems to be lower even in than the 737NG. On the 737 you need headsets in order to communicate easily, whereas on the MD-80 you do not need such a thing.


Dream no small dream; it lacks magic. Dream large, then go make that dream real - Donald Douglas
User currently offlineN685FE From United States of America, joined Dec 2003, 451 posts, RR: 11
Reply 2, posted (7 years 10 months 1 week 4 days 10 hours ago) and read 9502 times:

From your descriptions it could be like you said the stab trim, marker beacon (outer marker=400 HZ two dashes per sec, middle marker=1300 HZ alternate dot and dash, inner marker=3000 HZ only dots), and auto ground spoilers or ground noise. The cockpit floor area near the rudder peddles are only a couple of feet away from the nose gear bay.


psp. lead by example
User currently offlineCALPilot From United States of America, joined Oct 1999, 998 posts, RR: 14
Reply 3, posted (7 years 10 months 1 week 4 days 3 hours ago) and read 9419 times:

You are right on the first one, Trim horn

Second one is the radar altimeter counting down

Third one is the auto spoiler handle deploy


User currently offline113312 From United States of America, joined Apr 2005, 569 posts, RR: 1
Reply 4, posted (7 years 10 months 4 days 7 hours ago) and read 9185 times:

Also, do not forget that the nose gear is just below the cockpit. Don't know if you're talking about the sound of the tires spinning down after retraction.

User currently offlineSpeedracer1407 From United States of America, joined Dec 2004, 333 posts, RR: 0
Reply 5, posted (7 years 10 months 4 days 4 hours ago) and read 9164 times:

Quoting 113312 (Reply 4):
Also, do not forget that the nose gear is just below the cockpit. Don't know if you're talking about the sound of the tires spinning down after retraction.

Nope, these are all artificially produced noises from either speakers or mechanisms inside the cockpit.

Seems like CALpilot identified the sounds. Thanks for the replies.



Dassault Mercure: the plane that has Boeing and Airbus shaking in their boots.
User currently offlineN685FE From United States of America, joined Dec 2003, 451 posts, RR: 11
Reply 6, posted (7 years 10 months 1 day 4 hours ago) and read 9018 times:

Quoting 113312 (Reply 4):
Also, do not forget that the nose gear is just below the cockpit.

On the MD80, the nose gear bay is just forward of the cockpit (not by much). Right below the cockpit is the E&E, you are able to enter the E&E craw forward and on the left hand side climb up through and access door and end up in the cockpit.



psp. lead by example
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