I have asked the FAA  the definition of "structure" as it pertains to Part §107.51 and have yet to hear back.  Can anybody  elaborate on this. Does that mean if I have an inspection of a building that's 600 feet if I take off on the roof I'll have 400 more feet of air space about that building? Is that how I am interpreting it?

And yes I'll be using my mavic zoom for this project.

Yes its 400 feet above highest point near you. But remember if there is an emergency and MD, FD or PD helicopter may fly lower and you are responsible to keep your drone VLOS and get out of the way.

3BEPb Posted at 2-20 15:21
Yes its 400 feet above highest point near you. But remember if there is an emergency and MD, FD or PD helicopter may fly lower and you are responsible to keep your drone VLOS and get out of the way.

Even though it's in a class Bravo airspace?

Its a totally different issue

No person may operate an aircraft within a Class B airspace area except in compliance with §91.129


Its like to ask

should I treat my cut with antibacterial solution?
Yes
Even if its already got gangrene?

Drone-Pilot Posted at 2-20 15:27
Even though it's in a class Bravo airspace?

But do you have to have a purpose with that structure that's that high lets say 600 ft for us to be able to add the additional 400 that the FAA gives in the rules

Where I am planning to fly even though it's a Bravo airspace it's under a shell that starts at 1500 feet and it ends at 7 thousand feet

https://faa.maps.arcgis.com/apps ... 8e19806ebf6a06754ad

You can use this map to check altitude restrictions

3BEPb Posted at 2-20 15:50
https://faa.maps.arcgis.com/apps/webappviewer/index.html?id=9c2e4406710048e19806ebf6a06754ad

You can use this map to check altitude restrictions

The area that I want to fly in I know I can fly up to 400 feet from the the surface. I have to do an inspection of a building that 651 feet in the area and it's in a class B airspace but that class B airspace has a shell that's starts at1500 feet all the way to 7000 feet. What want to know is if I take off from the roof of the building that is 651 ft tall will I be able to add an additional fifty  or an additional 200 feet  or add 400 feet to that structure that is 651 ft. Remember I am not taking off from the surface I am taking off from the roof of the structure (aka) building

400 feet calculated from the highest point. In your case its your roof. Check what restriction they have in your area. Maybe its not 400. It maybe 0 or 100

3BEPb Posted at 2-20 16:23
400 feet calculated from the highest point. In your case its your roof. Check what restriction they have in your area. Maybe its not 400. It maybe 0 or 100

I already checked from the surface up to 400 ft

If in the USA and you are wanting to fly Class B airspace with a sUAS under part 107 i would think you would need a waiver to fly BVLOS unless i read your post(s) incorrectly.

BobB Posted at 2-20 16:45
If in the USA and you are wanting to fly Class B airspace with a sUAS under part 107 i would think you would need a waiver to fly BVLOS unless i read your post(s) incorrectly.

hopefully this will help. This is what some people call an upside down wedding cakes if you fly under one of those shelves you do not need to make any type of request you can fly from the surface to 400 fee without any issues even though you are flyin under a class B airspace as shown in the picture

Well then you are not telling us the correct airspace. I was just telling you what you need to do "IN CLASS B AIRSPACE" . If i am not answering this correctly then you need to ask your question differently.....or since you know so much why ask here?
If the structure you are wanting to fly above 400' AGL and within 400' of it rises into and above class B airspace then you will need something from the FAA when performing this trick.

BobB Posted at 2-20 18:13
Well then you are not telling us the correct airspace. I was just telling you what you need to do "IN CLASS B AIRSPACE" . If i am not answering this correctly then you need to ask your question differently.....or since you know so much why ask here?

This has become a two-part question. My original question was I need to inspect a building that is in a class B airspace and will be flying under a shelf that starts at 1500 feet and it ends at 7000 feet. The building is 651 feet. What I'm trying to find out if I take off from the roof of the building (meaning) I am taking off 651 ft above ground approximately from the roof. Can I add 50 feet 250 or take it all the way to 400 feet which I am not going to do because I do not need to go that high I would proximately need maybe a 150 feet above the take-off point and I apologize if I did not explain myself correctly from the beginning to anyone that I've confused

BobB is correct. Regardless your in class B airspace you will need a waiver.

Even though B starts at 1500, once you hit that 600 foot mark you have deviation in Class E

which is why you need a waiver.

The new CAPTCHA crap is the last straw.
Im tired of DJIs crap and am removing my posts and will be on my way.

Woe Posted at 2-20 18:58
BobB is correct. Regardless your in class B airspace you will need a waiver.

Even though B starts at 1500, once you hit that 600 foot mark you have deviation in Class E

I'm sorry but that information is incorrect

Brett Brandon Posted at 2-20 20:17
If I am getting this correctly you can go 400 feet above the building which is 651 feet. 651 + 400 = 1051 feet. The shelf starts at 1500 feet. That leaves 449 feet of space before the bottom of the class B shelf. You will be fine without authorization.

between the surface and 1500 ft which is  class B begins you do not need no type of authorization no waivers skyvector is your best friend when it comes to these tiers or shelves  some people call it different ways

BobB Posted at 2-20 18:13
Well then you are not telling us the correct airspace. I was just telling you what you need to do "IN CLASS B AIRSPACE" . If i am not answering this correctly then you need to ask your question differently.....or since you know so much why ask here?
If the structure you are wanting to fly above 400' AGL and within 400' of it rises into and above class B airspace then you will need something from the FAA when performing this trick.

Exactly how I felt.

should I treat my cut with antibacterial solution?
Yes
Even if its already got gangrene?

At the end its obvious that answer is right in front of you - so why asking us? Trolling?

3BEPb Posted at 2-21 08:44
Exactly how I felt.

should I treat my cut with antibacterial solution?

Nobody is trolling I am asking a legitimate question as I got two different answers that's why I came here to ask because I was not 100% sure

Just check again how you were unfolding your question little by little. Giving important tidbits of information and frustrating those trying to help you.  Why not publish everything in first post? Help us to help you.

3BEPb Posted at 2-21 09:00
Just check again how you were unfolding your question little by little. Giving important tidbits of information and frustrating those trying to help you.  Why not publish everything in first post? Help us to help you.

I started adding to the question as I remembered like I said the question has two parts and there was no intention and confusing anybody.  I only hear you complaining I don't hear no one else but thanks for the help