V Speeds

CBpilot

CBpilot

Well-Known Member
Quick question for all you CFI's here:

I am getting ready for my check ride this coming week and I have been doing a lot of prep with my CFI for the oral. We were going over the V-speeds for the C-152 I have been flying and the V-Speeds that he gave to me do not exactly match the V-Speeds in the Operators Manual that I have for the 152.

Which ones should I use?

I would ask him but I am not seeing him till next week and I am making flash cards for review..

Thank you in advance.

CB
 
CBpilot said:
We were going over the V-speeds for the C-152 I have been flying and the V-Speeds that he gave to me do not exactly match the V-Speeds in the Operators Manual that I have for the 152.
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Can you post some of the discrepancies? What year model 152? Are you absolutely sure the Operators Manual you're using is for the model of C-152 you're flying?

Assuming there is a real contradiction between the speeds your CFI gave you and the AFM, the latter is the more reliable source of information. And, your examiner for your checkride probably won't have access to the list of V-speeds your instructor gave you, so he'll be checking your answers against the AFM.
 
What model year is the 152? The various years have slightly different V-speeds, so your CFI might just have a generic checklist...in which case if your POH copy is for the model year of the plane you fly (which it should be...) go by it. The only thing I can think of that might change that would be if it has an STC for vortex generators or something else. Just a guess, but I'd bet a flight school C-152 won't have performance mods. So, IMHO, use the POH speeds if the model years match up. Or, just call the FBO and ask if you can go in to take a peek at the actual POH with all the supplements specific to the aircraft.
 
My flight School has three different 152's. I have a manual for a 1980 152. The discrepancies are 1 knot off. Example: Vno Manual says 111 CFI: 110
Vs: Manual says 40 CFI 42.

I know it is a small difference but I want to make sure I am spot on.
 
Sounds to me like he's thinking of a 150, not a 152 (your instructor).

Read the POH for the airplane, don't rely on second hand info. You should have the actual POH for that airplane w/you on the for the oral. If the examiner asks for a specfic airspeed, tell him/her "I'm preaty sure it's 40KIAS, but lets double check to make sure."

Don't step on your junk from what someone tells you it is. Trust, but verify.
 
CBpilot said:
Quick question for all you CFI's here:

I am getting ready for my check ride this coming week and I have been doing a lot of prep with my CFI for the oral. We were going over the V-speeds for the C-152 I have been flying and the V-Speeds that he gave to me do not exactly match the V-Speeds in the Operators Manual that I have for the 152.

Which ones should I use?

I would ask him but I am not seeing him till next week and I am making flash cards for review..

Thank you in advance.

CB
Click to expand...

As a CFI we teach (and were taught ourselves) ARROW - O = Operating Limitations - from the AFM.
 
Perhaps the difference is due to a difference in units of speed. MPH versus KIAS. Not sure when Cessna made the transition, but it could be something to check into.
 
Good advice so far, so I would like to make my segue and say POH of olden days were a joke.
And not even an ambiguous joke.
 
VG's was mentioned already and its a good point. make sure there is no alteration on the plane. A stol kit would be more likely and would change some of the Vspeeds. If your instructor gave a complete set of Vspeeds written down/typed out whatever you can use those just fine. Explain to the DPE the numbers you have, were given to you by the CFI. However I think you should know why they are different from the AFM. The safe way would be to use the AFM (if it is indeed aircraft specific) Vspeeds. you don't have any way of getting into contact with him? what about someone else at the school/fbo?
 
CBpilot said:
My flight School has three different 152's. I have a manual for a 1980 152. The discrepancies are 1 knot off. Example: Vno Manual says 111 CFI: 110
Vs: Manual says 40 CFI 42.

I know it is a small difference but I want to make sure I am spot on.
Click to expand...
You will have to have the AFM for the specific airplane that you will be using on the flight test. It will have the airplane's serial number. You are expected to be able to use an AFM for the flight test - not your instructor's notes.
 
Guys,
Thank you all for the responses. I got the correct V-speeds for the plane I will be taking on my check ride next week.

We went through the v-speeds and I showed him the errors. It was not CAS/IAS. We worked the issue out and needless to say it was an error.

Thanks for the input because without I may have gotten something this easy wrong on the oral portion of the check ride.

CB
 
Douglas said:
Good advice so far, so I would like to make my segue and say POH of olden days were a joke.
And not even an ambiguous joke.
Click to expand...

I was looking up Vx for my '72 Citabria 7ECA a couple of days ago. It defines Vx and says to climb at Vx when on a short field with obstacles. NO WHERE does it actually say what Vx is!
 
nosehair said:
You will have to have the AFM for the specific airplane that you will be using on the flight test. It will have the airplane's serial number. You are expected to be able to use an AFM for the flight test - not your instructor's notes.
Click to expand...


Thats a wide net. Youhaven't flown any old birds. I asked this question a while ago, and found out that some airplanes don't have a specfic AFM/POH. It was only for that model, and you could buy one at any FBO, and throw it in the airplane and be legal.
 
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