91.215 "deviations"

[minitour]

Pretty good "discussion" today in ground school about this one.

Okay, so we all know that you can't operate in Class C airspace without Mode-C. But according to 91.215 if we get an ATC authorization, we can.

91.215
(d) ATC authorized deviations. Requests for ATC authorized deviations must be made to the ATC facility having jurisdiction over the concerned airspace within the time periods specified as follows: (1) For operation of an aircraft with an operating transponder but without operating automatic pressure altitude reporting equipment having a Mode C capability, the request may be made at any time.


So let's assume we're out on a flight and our Mode-C isn't showing up with anyone, well we decide we're done so we turn around to head home (Class C Satellite Airport) and contact approach with a request for a T&G at the primary airport, if approach says "roger expect runway 32", does that count as the "authorized deviation?"


The class is split about 50-50. It came up because I guess a controller jumped all over an instructor the other day when he was handed off from approach to local for the touch and go (this exact scenario). The student says his instructor said he talked to approach and they didn't seem to think it was a big deal, but if it was they would leave. To which they were cleared for touch and go.


I'm with the half that thinks this counts as the "authorized deviation" since the controller could have said "negative, remain clear of the class C airspace" or something like that...


opinions? legal references? time for the CFI to fill out a NASA? It was a commercial student (already a PPL) so if the CFI needs to fill one out (as PIC) would the student also (as PIC?)


-mini

 

[Iceman21]

That scenario does not paint the picture of an authorized deviation, in my opinion. Nothing has been stated to approach that the Mode C in your transponder is not working. It is the instructor's responsibility to inform ATC of any equipment failure, mandatory in an IFR enviornment. It is laxidazical at best for the "professional" instructor to assume he is good to go because ATC gives a clearance with only half the required information.

The heart of the reg is that ATC have some advanced notice. These guys never made any "Request for authorized deviations" they just called to get a clearance.

If anyone is going to fill out a NASA form in this case, it would be the CFI only. The CFI is acting as PIC, while the commercial student is logging PIC

Just my .02

 

[midlifeflyer]

Looking at the language of the regulations, I doubt that "establish [and maintain] two-way radio communications" [91.130(c)] equals a "request" for an ATC authorized deviation [91.215(d)].

To say that there was an authorized deviation here, you would have to say =both= (1) that flying without an operating transponder is an "automatic request" =and= (2) that ATC saying nothing about the transponder is an "automatic authorization". I don't see anything that suggests that either is correct, let alone both. If anything, the hoops in the rest of 91.215(d) indicate just the opposite - nothing about this is automatic.

I dodn't see any harm in both pilots filing a NASA report. Remember that while the PIC is the one who is ultimately responsible for a flight, the PIC is not the =only= one responsible for a flight.

 

[Sctt@NJA]

Mode-c is one of those things you can't preflight, and if it stops working in flight you don't inform atc... they inform you. Then you don't know if it's really broke good or intermitent, or maybe just a little hiccup.

The good new to your scenario is that mode-c is not required to fly underneath class-c, if that's where the home base airport is then no problem. The touch and go at the primary airport would not be a great idea since the lesson was apparently called off because "Mode-C isn't showing up with anyone, well we decide we're done". Well touch and goes at a different airport aint done. That's like saying "hmmm looks like our radio isn't working, let's go out of our way now to enter some class B and do some touch and goes at the primary with light gun signals"... well ok its not that bad.

Anyhow the point is mode-c can stop working anywhere and at any time. It was not a known problem prior to the flight. Finding out about it in flight and then entering class-c where you don't need to be probably isn't the smartest thing to do.. but hey its probably not the dumbest either.

Of course if the mode-c was discovered to be inop while in class-c then you can hardly blame the pilot.

 

[Sctt@NJA]

Oh yeah, now that I have said all that... I don't think the ATC communication qualifies as a deviation... but I am not real sure either.

 

[minitour]

Cool...I see what y'all'r saying about the "request".

Now lets play another game:

Say approach told you "hey your mode C isn't working" when you were inbound to the primary airport and you respond that you'd like to request a touch and go or even a full stop cuz you need to pick someone up.

Does that constitute the request since they knew your mode c wasn't working?

I'm just concerned with the language...I don't want to be stuck on a checkride in one of these planes and have the mode c go inop and not know the correct language.

Do I need to bust out a "our mode c isn't working we'd like to request through the class charlie airspace enroute to ___" ? or is "hey our mode c isn't showing up, is direct to ___ a problem?" okay?

Just a little concerned with the CSEL/MEL and CFI checkrides right around the corner...I'd hate to pink and have to fill out a NASA at the same time on the same flight.

-mini

 

[midlifeflyer]

Do I need to bust out a "our mode c isn't working we'd like to request through the class charlie airspace enroute to ___" ? or is "hey our mode c isn't showing up, is direct to ___ a problem?" okay?

Pretty much. Unfortunately, I haven't seen any AIM-standard phraseology on this one. If you are contacting the facility and already know that your Mode C is inop, a simple

"Approach, Skyhawk 1234X. Negative MODE C. (or MODE C INOP) Request deviation to transit Class Charlie enroute to Podunk"

should do it.

If ATC is the one to inform you,

"Request deviation to transit Class Charlie negative MODE C enroute to Podunk"

is enough.

 

[Guitar Guy]

It would certainly be prudent to inform ATC of the inop Mode C on first contact. Best to be up front than to have a misunderstanding or worse down the road. It only takes a few seconds to let them know about the Mode C, so why not just mention it and be safe? I find that in situations like that, ATC is glad to have the info and appreciates you being up front about it.

 

[avbug]

The most salient point of this thread, as yet not discussed, is not weather establishing contact constitutes an authorization to proceed with inoperative equipment (it does not), but rather failure to adhere to 14 CFR 91.125(a).

Apparently a crew of two pilots, a student and an instructor (?) proceeded based on an assumption regarding the intent or authorization afforded in an ATC clearance.

When a pilot is uncertain of an ATC clearance, that pilot shall immediately request clarification from ATC. If you're not sure if you've received authorization to operate without the transponder, then ASK!!!. Don't make an assumption. Ask. It's good practice, and a violation of regulation when you fail to do so.

 

[minitour]

avbug:
I don't think that really applies here.

I do understand what you're saying, and that's what I'll be doing unless they specifically tell me "proceed as requested" or "bla bla without mode c bla bla" (should the situation, hopefully, not come to me).

But they were sure of themselves when the controller said to expect whatever runway that the deviation was okay.

It only came up when we were discussing required equipment and radio stuff in certain airspaces in ground school when the student said "oh yeah well if you get authorization...".

Actually the ground school instructor started going off about not going through certain airspace without the mode c working and how you shouldn't even fly a plane that has a mode c transponder if the mode c isn't working. I thought the vein in his head was going to explode. He was pretty adamant...of course he's also the guy that told us flying over gross is "okay" as long as you aren't out of the CG envelope. Which I don't understand, because the CG envelope in all of my POHs stops at MTOW...but that's another thread...

I do think that's a great point though, to ask...and I made a mental note in case (like I said) that ever happens to me, I won't have to fill out the NASA, because I'll know.

...anyway...

...anyone have anything firm to go on regarding the correct phrasing they want to hear for the request? Is this a call the FSDO and ask them thing or is that just going to open up an unnecessary can of worms?

Thanks again for the discussion

-mini