Hawker445

From what i understand there are toons of people that have had to retake the class

I mean the prof is a great teacher and knows his stuff. Many students and past students think he's making it impossible for people that aren't in his mechanics lab. It's just this class that normally a lot of people have trouble with compared to other classes in the curriculum.

And the reason why i am asking this question is for "aircraft systems" Class is just meant to teach the understanding and different types of pressurization systems, electrical, oxygen. etc. That kind of stuff.

UnderOveur

This.

Unless, of course, they are a flying CFI.

bcrosier

I got that it was for a systems class, and I understand that. I do take issue with part of the above statement though. He may "know his stuff," but if he can't present it in a fashion where most people in the course are able to comprehend it in such a fashion that learning takes place he isn't a great teacher. They have a term for people like that where I am - "No longer with us..."

Again, if the guy can't present the material in a way which is understandable and relevant (and I'm having difficulty with the latter here in particular), then someone above him needs to help him "see the light." I don't know the Metro - it might be representative of other turbine aircraft of that generation, in which case I'd say using it as an example is legitimate. However, pressurization isn't a black art - it should be presented in a way which makes the information understandable to the intended audience.

HSLD

What's the name of the University, College, or Tech School where this course is being offered?

Airhoss

I flew the Merlin III as a corporate pilot and have been to flight safety on it multiple times. I can't answer the question presented. Your prof is blowing some serious bleed air out his tail pipe with that question.

Thedude

^^^^^^^
What he said.


We are still waiting to here the name of the school/university/college.

JohnBurke

I haven't heard anything yet that suggests the instructor doesn't know his material or doesn't have a purpose in presenting this information. Sounds like the instructor is talking about engine pressure stations, and if so, has a valid point regarding P3, etc. It's a systems class, right?

HSLD

Here are some notes on the Garrett TPE 331 motor:

http://eastaire.us/files/TPE331pilotnotes.pdf

Look at page 12

Airhoss

Okay lets reread the question and here is the part that I am having a hard time with. When we refer to the Metroliner "pressure" system what are we talking about?

Are we talking about the pressurization system or are we speaking of the different pressure/bleed stations within the Garret engine? Maybe a better presentation of the question and some context is in order.

bcrosier

While the most typical use of P-references is for stations within an engine, they can be used for any reference pressure - including within the pressurization control system. Unfortunately without reference material to the specific aircraft or pressure controller it would be shooting in the dark to try and guess what the different values reference or control.

In the unlikely event he is referencing the engine, the Pstations on the TPE-331 are as follows:

P1 - Ambient pressure
P2 - Engine Inlet (Compressor inlet)
P3 - Compressor discharge (highest pressure location within the engine)
P4 - Turbine Inlet (highest temparature point in the turbine section)
P4.1 - Interstage Turrbine (inlet to the second stage turbine stator)
P5 - Exhaust (Turbine discharge pressure)

http://eastaire.us/files/TPE331pilotnotes.pdf

HSLD - you all beat me to it - apparently we're Googling the same stuff at the same time!

But again - I don't believe that is what is being referenced here.