Well said, pelmet. Trey... Doctoral level? That's an insult to doctoral level discussion. I can't speak for others but I only have a high school diploma to my name - I've done some post secondary education but haven't even got a diploma. And it's "scary" for a student to get answers to questions you...

This ridiculous banter is why I end up leaving AvCanada for months at a time. It's hard to handle! photofly, I think all of us that are currently discussing this matter understand the effects of temperature on aircraft performance. All I'm saying, and I think PilotDAR is saying, is to follow your AO...

I'm not telling anyone not to follow anything. I'm saying that trying to impose a power limit by limiting RPM/MP without reference to temperature is accurate to no better than 1 part in 5. That's not very accurate. photofly, you're telling me that the POH/AFM has set limits that aren't accurate to ...

What should I do about that 20%?

What should a pilot do then to ensure they don't exceed an engine limit if you're telling them not to follow the POH/AFM?

You haven't mentioned humidity yet either. Water vapour is about 64% the weight of dry air. That's gotta affect power a bit eh!

photofly, you're correct from a technical point of view but in operation it isn't practical to also include air temperature. It's worked just fine to limit the engine using a MP gauge. I don't design airplanes but I'd imagine they'd just be conservative plus have limits on CHT. That's really all you...

I'm back! haha Well that was an interesting read. I think PilotDAR and photofly are both correct. Except I really gotta side with photofly here. He's spot on and it's important to understand that the power of the engine is affected by manifold pressure, RPM, and fuel flow (plus temperature but we do...

Well that's a whole different topic!

Why does Mr Aviation's instructor, and so many other pilots, have the opinion that you have to climb at at least 500'/min because that's what ATC expects? Anyone who thinks that has it completely backwards! You are the pilot, YOU fly the airplane the way it was made to be flown. It is ATC who is tol...

The reason for the decrease in Va with a decrease in weight means they're looking to ensure that you don't exceed a certain G limit. Hopefully student understands why it's not good to exceed the G limit in the POH. Then explain that to do so you need to limit the max lift the wings can create as you...

To add to my post: http://i.imgur.com/jpLxkjC.jpg This shows that as weight decreases, the flight envelope opens up and you can pull more G. Figure 3.9.4 shows the allowable flight envelope at 75% of max gross weight. Read the first four sentences at the top of the page. Then near the bottom it says...

I'd strictly reference the Nav Canada document - it's been recently created by the folks who run the entire controlled airspace system in Canada. If it doesn't answer your question then I'd reference the phraseology section of the AIM. The April, 2015 edition of the AIM still has you saying "ready f...

This is always a fun topic! What is "maneuvering speed"? You can ask some pilots/engineers and they'll tell you that maneuvering speed doesn't change with weight - and they're correct. But to most pilots, maneuvering speed (generally known as Va), will decrease when weight decreases. Maneuvering spe...

BPF What do you think the chances are that you will ever in your life encounter the GPS saying you're 0.5nm off when the ADF says you're on track, while you're flying between the FAF and MAP? I think I'll have about 20 engine failures before that happens. You'd have a point if they decided to reduce...

The accuracy of the unit does not change when the mode changes only the CDI scaling,... Not entirely. The accuracy doesn't change but the alert limit changes (RAIM) as well as the CDI scaling. You won't get an alert that the accuracy isn't sufficient for the approach until the position uncertainty ...

I'll pose a hypothetical situation to the very experienced and wise pilots in this thread who have said clearly that they will completely disregard the ADF when flying a non-overlay NDB approach on the GPS. A number of GPS units (KLN 90B included) will not change into terminal mode (RAIM and CDI sen...

CatDriver I don't have any experience using BFO operationally so I couldn't tell you much other than what I can repeat out of a book. I know what it means and what it does but in North America I haven't run into places where I need to use the BFO feature. Just like with SA, I haven't bothered to rea...

Haha you guys seem to have a hard time with the English language.

Ya, interesting to know. I had read that SA was no longer active so I had skipped over the SA info in the AIM.

Photofly

I could attack you for not reading the very section in the AIM that you chided me for not reading. Do you know the difference between a recommendation and a requirement? Do you know the difference between shall and should?

Stop being a dick.

Photofly I can't say for sure but I'm not sure how having the capability for SA and turning it off affects RAIM availability at all. My understanding is that SA is not controlled by the receiver, a signal is sent from the satellite. So turning SA off improves the accuracy of the signal to the receiv...

Photofly SA doesn't exist anymore. See COM 3.14.4.1. Regarding flight planning requirements there are none. The only flight planning RAIM check required is when planning a GPS alternate. Most pilots know there are requirements but I haven't met one that actually knows what exactly needs to be checke...

I wanna play Devils advocate here. When you were flying in the 80's did you tell people that flying an NDB approach with an ADF is unsafe and they shouldn't be doing that? I don't think you did. The minimums and obstacle clearance are built such that you have similar a similar safety level compared ...

BPF I fully agree. Fly those approaches on the GPS. That's really the safe way to do it. But if I can do it safely and legally (monitoring the NDB), why not? Too many pilots get it in their head that they know how things work so they can decide what's safe and fly that instead of following the rules...

AuxBatOn I appreciate and encourage your enthusiasm to understand this subject matter, however, I think it's apparent that you don't know what RAIM is other than a definition you can read verbatim after searching Google. The simplest explanation I can give with regard to what RAIM really is would be...

Dammit! I wrote out replies and AvCanada logged me out and everything is now gone. Time to write again. Photofly Your quote from C129 doesn't conflict with my quote from C129. Mine specifically states that when an approach is loaded, the GPS must..... Yours doesn't say specifics with regard to an ap...