tonycondon
Gastons CRO (Chief Dinner Reservation Officer)
i believe that money has always been an object in pilot training
We are using the same words to define different things.
I wouldn't teach it or fly it that way. I don't think passengers would like it much either. Landing is scary enough (for them) without giving them a death plummet followed by a yank-and-save.
edit to add (for them). thought it made it clearer what I meant...
Well the book says fly into the wind between 1,000 and 1,500 feet and cut the power directly over the selected landing spot. "Common faults: (1) usual faults in gliding turns, (2) Improper allowance for drift, and (3) Faulty planning of flight path.
Sounds like an exercise in aircraft control to me, but I wasn't there.
i believe that money has always been an object in pilot training
Yes, they are much more reliable. While the designs haven't changed, the materials quality and process controls have improved dramatically, and the result is a lot fewer engine failures for mechanical reasons. Yes, there are still occasional problems, but those problems get caught and fixed a lot faster. If you dig into the accident reports, you'll see there are very few real mechanical engine failures these days other than engines which were seriously neglected.Are they really that much more reliable than in 1941? They haven't changed much. Brand-new engines have failures due to manufacturing flaws or improper maintenance/operation, and there are 1941 engines that haven't quit yet.
Cutting power to idle when the runway is made is not contrary to the FAA's Stabilized VFR Approach concept. In fact, most light airplanes really need to have the power pulled to idle or they don't want to land at all. The question is how you get from the abeam position to the point of having the desired touchdown point made, i.e., the approach, not the landing maneuver. I suspect that you are flying partial-power stabilized approaches up to that point, and then cutting power to land, yes? If so, you're doing just what the FAA and I both recommend.I'm consistently landing with no power. "When you see that you have the runway made, pull power to idle" has been drilled into my head.
Am I learning everything the wrong way???? Or does learning it the "harder" way make me a better pilot? (Not sure if that is the "harder" way... I'm just taking a stab at why I might be being taught this way).
I disagree -- she's flying a light GA plane, not an RJ. In jets, yes, you often carry power to touchdown (always, in a Navy carrier jet). However, in a light GA plane, you have to go to idle once the touchdown point is made and the transition to landing is begun or the darn thing won't quit flying. And the result of that is hardly a "death plummet followed by a yank-and-save" if you approach at 1.3 Vs0 and then make a smooth reduction to idle as you reach the transition point.I wouldn't teach it or fly it that way. I don't think passengers would like it much either. Landing is scary enough (for them) without giving them a death plummet followed by a yank-and-save.
Because power-off landings require you to cut the power at just the right point (and that point changes with wind direction and velocity) and then you have to manage speed and glide path with only angle of attack. That complicates matters significantly because then neither speed nor glide path are stable during the approach. If you use angle of attack to manage speed, and power to manage glide path, you have a lot easier time keeping both stable, and that makes for better landings.
Not a darn thing, but I've seen folks so intent on making their power-off approach work that they forget the throttle exists.Yeah, but if you're a little short, what's wrong with adding a little power to make the threshold?
I disagree -- she's flying a light GA plane, not an RJ. In jets, yes, you often carry power to touchdown (always, in a Navy carrier jet). However, in a light GA plane, you have to go to idle once the touchdown point is made and the transition to landing is begun or the darn thing won't quit flying. And the result of that is hardly a "death plummet followed by a yank-and-save" if you approach at 1.3 Vs0 and then make a smooth reduction to idle as you reach the transition point.
Not a darn thing, but I've seen folks so intent on making their power-off approach work that they forget the throttle exists.
No, I've just flown with a lot of pilots over the four decades I've been an instructor, and the Law of Large Numbers applies -- you fly with enough of 'em, you'll see just about everything. And then just when you think you've seen everything, somebody shows you something you haven't seen before. You really should go get your CFI -- you could learn a lot from your trainees. I know I have.You seem to consistently fly with the most incompetent pilots I have ever heard of.
I'm curious as to how many engine out to water landing Cap'n Sully practiced....
I'm curious as to how many engine out to water landing Cap'n Sully practiced....
...Second, even in a GA plane with the power at idle there is some thrust. For proof walk behind a C-152 in the chocks at idle power setting up for flight while holding a birthday cake with the candles lit...
If that were not so, we wouldn't feather the dead engine on a twin. Flight thrust/drag and static thrust are significantly different. For a really god example of that, set zero thrust on the simulated dead engine at approach speed, and then leave it there during landing. Just make sure you have a lot of runway in front of you when you do that. That's why one of an ME instructor's responsibilities is to retard the simulated dead engine's throttle to idle during landing.A C152 sitting on the ramp at idle with near-zero airspeed produces a little bit of thrust. But at typical pattern airspeeds, a prop turning at 1,000 RPM is going to produce a bunch of drag, even more than if it the prop was completely stopped.
Want proof? Get some altitude over a safe landing area, reduce airspeed to almost a stall, kill the engine and let the prop stop, then put the nose down to obtain best glide and see what your descent rate is. Repeat with the engine running, and you'll find you need something like 1,500 RPM to reduce the descent rate back to that of a stopped prop.
There are lots of reasons 121 is safer. I would put stabilized approaches toward the bottom of the list. There are a lot of reasons to fly stabilized approaches in a jet in my very limited experience (1,700 /H hours); essentially a requirement. BUT 121 training, lot's of flying (proficiency), equipment, rules (enforced), multiple crew members, CRM, stricter regulations (e.g, can't start an approach if field is below minimums), and much more. Most 121 pilots fly more in a month than most GA pilots in a year.
I admit, I like to discuss engine failure with my student (singular) and we practice forced landings. The reason I practice engine out with her though is more about learning aircraft control than worrying about having an engine quit. (Although since her love is antique cabin Wacos, that is something for which she should be well prepared.)
I think there is some question about your idle thrust comment. The truth is that a prop, unless you are full decrease with a constants speed prop, is a high drag item even at "idle" thrust. the engine is not adding much at idle, and having it quit isn't going to make much difference. And if you have a choice, why would you aim for the numbers with no power?
Yes, when the instructor KILLED the engine on me and made me spiral down to the runway, I could tell no difference in the way the plane glided as compared to engine idle.
A C152 sitting on the ramp at idle with near-zero airspeed produces a little bit of thrust. But at typical pattern airspeeds, a prop turning at 1,000 RPM is going to produce a bunch of drag, even more than if it the prop was completely stopped.
Want proof? Get some altitude over a safe landing area, reduce airspeed to almost a stall, kill the engine and let the prop stop, then put the nose down to obtain best glide and see what your descent rate is. Repeat with the engine running, and you'll find you need something like 1,500 RPM to reduce the descent rate back to that of a stopped prop.
No reason for it not to work fine other than the need for a slightly curved final so you can keep the runway in sight.Try a "stabilized approach" in a Pitts Special, see how that works for you.
What a lot of folks don't seem to follow is that the basic concept of the stabilized approach can be used in any airplane regardless of size or propulsion or desired glide path angle (which is usually more like 4-5 degrees in light singles for VFR patterns). There are different guidelines on how to do it for light GA planes versus turbine-powered transport types, but the fundamental concept (use of AoA via trim/pitch to manage speed while using power to manage sink rate and thus glide path) applies equally well to all.eah, in a multi-engine, turbine powered aircraft, a stabilized approach below 1,500ft. or so makes complete sense. For that matter, on any instrument approach it's essential. Otherwise, I agree most with Nosehair's take on the subject.
There is nothing in the stabilized approach concept about making traffic patterns larger than necessary. Anyone who suggests that a two-mile final is necessary for a stabilized approach in a 172.My only recurring compaint about 'stabilized approaches' is having to follow the 172 with the future 747 pilot at the controls - judging by the size of his pattern.
I see your point, but I'm a firm believer that consistently good landings require consistently good approaches, and the stabilized approach is the best way to achieve that. It's kind of like the old Navy safety poster showing the bits and pieces of what used to be an A-4 Skyhawk laid out neatly on a hangar floor in the shape of the airplane, each part in its proper location relative to the others. The caption was "There's No Approach Which Can't Be Salvaged." Make a good approach, and there's nothing to salvage.Ron -
I think our discussion is really about semantics...in order to (consistantly) land on the runway with precision, a stabilized approach is neccesary. I just think the focus should be on the the landing rather than on the approach.
You weren't being observant enough.
That could all be true, but I think what Henning was hinting at in his own way is that there is plenty of test data to show that your glide ratio is significantly increased when the prop is stopped. However, the difference between throttle-dle versus ignition/fuel-off with the prop still windmilling is not, to my knowledge significant, which would explain why you didn't notice any difference if you didn't stop the prop.I don't know if it's a lack of observation capability, which I do not possess, or the pucker factor. My eyeballs were out so far that they were making smudge marks on the inside of my glasses.
Either I couldn't tell the difference or my brain compensated for it quickly because it was amazingly natural and the outcome amazed me as well.
Great article, thanks for posting.
So back to LOC-I... What needs to happen? More instructor training? I hear loud and clear: no spins, no power off landings. How about slips? I don't fly with other pilots much, but I have flown with at least two CPs who couldn't really slip.
It seems to me that if loss of control inflight is a problem there needs to be a focus on aircraft control at the margin which doesn't exist today. Should BFRs get serious with PTS-like requirements? Type rating like requirements for airplanes that have higher than average accident rates?
To me this is as important to save GA as more starts.
I think that's probably what would happen with a real engine failure too. You just do what is necessary to get the airplane down in the correct spot, hopefully. I don't necessarily think that all kinds of calculations are going to help. I'm guessing the wind will affect your glide angle more than the prop anyway.I don't know if it's a lack of observation capability, which I do not possess, or the pucker factor. My eyeballs were out so far that they were making smudge marks on the inside of my glasses.
Either I couldn't tell the difference or my brain compensated for it quickly because it was amazingly natural and the outcome amazed me as well.
That may be your personal definition, but by the generally accepted definition as given in the various FAA and industry docuements, if the airspeed is changing (even at a steady rate of change), it's not a stabilized approach.I don't think there's really anyone disagreeing with that. It's just a matter of what your envelope of stable is. If I am stably decelerating and descending while maintaining constant bank and load factor, that is a stable approach regardless the angles and rates so long as it leaves me at the threshold with the gear down, full flaps and <1-3% energy to spare.
FAA Safety is requiring the following Positive Aircraft Control course for Basic WINGS certification:
http://www.faasafety.gov/gslac/ALC/CourseLanding.aspx?cId=36
Positive Aircraft Control is the opposite of Loss of Control, so this course applies. Take a look at it, enroll in the course and run through it and the quiz. You'll find there are more common causal factors to LOC than engine failures. It's usually the pilot's doing... or not doing, as the case may be.
That may be your personal definition, but by the generally accepted definition as given in the various FAA and industry docuements, if the airspeed is changing (even at a steady rate of change), it's not a stabilized approach.
You're talking about the beginning of training in landing with a dead engine, right?feather the dead engine on a twin. Flight thrust/drag and static thrust are significantly different. For a really god example of that, set zero thrust on the simulated dead engine at approach speed, and then leave it there during landing. Just make sure you have a lot of runway in front of you when you do that. That's why one of an ME instructor's responsibilities is to retard the simulated dead engine's throttle to idle during landing.