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#1
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Approach speeds for ILS
We get foggy here at Tacoma Narrows this time of year (which is the reason I
post more on these groups in the winter than in the summer). One thing we see a lot of is guys who fly the ILS too fast. I have no problem with flying the ILS at 90 or 100 knots if the ceiling is well above minimums, but it seems to me that if the ceiling is 200 feet overcast you ought to be flying the approach slowly enough that you can land at that speed. You don't need to configure for a short field landing, but you are not going to slow from 90 knots to 60 in a Skyhawk in only 200 feet of altitude, especially if you can't risk ballooning back up into the soup. You just want to hold your breath when you hear somebody coming down the ILS. You don't see him, but you hear the engine start to roar as he begins his missed approach. Then he suddenly breaks through and tries to land anyway. Sometimes they make it, probably touching down on the last half of the runway, and sometimes they don't, having to make a go around back up into the soup, only now the missed approach is all messed up, too. Two lessons he 1) If the field is really at minimums, you have 200 feet to slow down to landing speed. That is not much time. Better you should be ready to land before you break out. 2) If you decide to go missed, then go missed. Don't change your mind just because you got a glimpse of the runway as you were flying overhead. -- Christopher J. Campbell World Famous Flight Instructor Port Orchard, WA If you go around beating the Bush, don't complain if you rile the animals. |
#2
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"C J Campbell" wrote in message ... I have no problem with flying the ILS at 90 or 100 knots if the ceiling is well above minimums, but it seems to me that if the ceiling is 200 feet overcast you ought to be flying the approach slowly enough that you can land at that speed. You don't need to configure for a short field landing, but you are not going to slow from 90 knots to 60 in a Skyhawk in only 200 feet of altitude, especially if you can't risk ballooning back up into the soup. I am not sure I understand. Slowing from 90 kts to landing from 200 feet should not be a problem for a moderately skilled pilot on an average sized ILS runway (4000 ft or more). That is what one would expect from an instrument rated pilot, no? |
#3
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"plumbus bobbus" wrote in message news:SylPb.109551$8H.237126@attbi_s03... | | "C J Campbell" wrote in message | ... | | I have no problem with flying the ILS at 90 or 100 knots if the ceiling is | well above minimums, but it seems to me that if the ceiling is 200 feet | overcast you ought to be flying the approach slowly enough that you can | land | at that speed. You don't need to configure for a short field landing, but | you are not going to slow from 90 knots to 60 in a Skyhawk in only 200 | feet | of altitude, especially if you can't risk ballooning back up into the | soup. | | I am not sure I understand. Slowing from 90 kts to landing from 200 feet | should not be a problem for a moderately skilled pilot on an average sized | ILS runway (4000 ft or more). | | That is what one would expect from an instrument rated pilot, no? You would expect that, but observation teaches otherwise. Reaction time after breaking out of the clouds may be a factor. There is always a little disorientation. The newer 172s are surprisingly slippery, especially if you are not using any flaps. Add to that a pilot that may not be all that current and I think you have trouble. |
#4
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"C J Campbell" wrote in message ... | I am not sure I understand. Slowing from 90 kts to landing from 200 feet | should not be a problem for a moderately skilled pilot on an average sized | ILS runway (4000 ft or more). | | That is what one would expect from an instrument rated pilot, no? You would expect that, but observation teaches otherwise. Reaction time Point taken. |
#5
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In a previous article, "C J Campbell" said:
I have no problem with flying the ILS at 90 or 100 knots if the ceiling is well above minimums, but it seems to me that if the ceiling is 200 feet overcast you ought to be flying the approach slowly enough that you can land at that speed. You don't need to configure for a short field landing, but you are not going to slow from 90 knots to 60 in a Skyhawk in only 200 feet of altitude, especially if you can't risk ballooning back up into the soup. I regularly shoot approaches at 110 knots in the Archer or 120 knots in the Dakota, and don't touch the throttle until the flare. Granted, I haven't done it to minimums in actual, but I've done it under the hood, and I don't gain any altitude. Sure you float down the runway, but if you've got 8000 feet, you've got plenty of room for it. And ATC appreciates a fast approach when they've got a 767 on your tail. -- Paul Tomblin http://xcski.com/blogs/pt/ I didn't need to sabotage anything. Not being around to say "No that won't work" or "you can't do it that way" is more than enough damage. (Ego problem? It's not a problem.) -- Graham Reed, on job endings |
#6
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"Paul Tomblin" wrote in message ... | you've got 8000 feet, you've got plenty of room for it. And ATC | appreciates a fast approach when they've got a 767 on your tail. | | Not many 767s at TIW! Seriously, I have no problem with accommodating ATC when it can be done safely, but neither am I going to do their job for them when they screw up. It is always fun to watch somebody who landed too fast and too long then try to turn off at the first exit just because the tower asked him to, especially when it was probably the tower that asked him to keep his speed up when he was on final. They come whipping around there, side loading the gear and nearly careening off into the infield, tires smoking and screeching. But what the heck, it's only a rental. |
#7
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C J Campbell wrote:
Paul Tomblin wrote: | you've got 8000 feet, you've got plenty of room for it. And ATC | appreciates a fast approach when they've got a 767 on your tail. | | Not many 767s at TIW! Seriously, I have no problem with accommodating ATC when it can be done safely, but neither am I going to do their job for them when they screw up. Not always the case. Here at SJC when ATC asks: "Say best forward speed?" they're saying "Look Hilton, we've got a bunch of 737s, 757s, 777s, a few DC-10s etc coming down the approach. You gimme 120, I can get you in within 5 minutes. You gimme 90, maintain VFR, hold where you are, expect your clearance sometime in the future." Hilton |
#8
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"C J Campbell" wrote in message ...
"Paul Tomblin" wrote in message ... | you've got 8000 feet, you've got plenty of room for it. And ATC | appreciates a fast approach when they've got a 767 on your tail. | | Not many 767s at TIW! Seriously, I have no problem with accommodating ATC when it can be done safely, but neither am I going to do their job for them when they screw up. It is always fun to watch somebody who landed too fast and too long then try to turn off at the first exit just because the tower asked him to, especially when it was probably the tower that asked him to keep his speed up when he was on final. They come whipping around there, side loading the gear and nearly careening off into the infield, tires smoking and screeching. But what the heck, it's only a rental. Like CJ mentioned, a fast approach speed makes it somewhat difficult to transition to the landing phase. However, I believe that the benefits outweigh the disadvantages. - ATC likes it if you fly the approach faster - Reduces the exposure time in icing conditions. At this time of year, we can often climb above the clouds and remain there until the approach phase. A fast approach will minimize ice accretion during approach. - A faster approach speed makes it possible to adjust for altitude excursions by using elevator alone and without compromising too much airspeed. At slower airspeeds you will have to make power adjustments. For example, at 90 knots you will lose about 9 knots in order to climb 100 ft. At 60 knots you will lose 18 knots to climb 100 ft. Finally, 90 kts to 60 kts in a draggy airplane like a skyhawk is not a big problem. You can do that by pulling power to idle and not even use any flaps. However, in a slippery airplane like a Mooney that may be a problem. But such airplanes tend to have high approach speeds anyway, so slowing down much below 90 may not be an option. |
#9
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"Andrew Sarangan" wrote in message
om... Like CJ mentioned, a fast approach speed makes it somewhat difficult to transition to the landing phase. However, I believe that the benefits outweigh the disadvantages. - ATC likes it if you fly the approach faster - Reduces the exposure time in icing conditions. At this time of year, we can often climb above the clouds and remain there until the approach phase. A fast approach will minimize ice accretion during approach. - A faster approach speed makes it possible to adjust for altitude excursions by using elevator alone and without compromising too much airspeed. At slower airspeeds you will have to make power adjustments. For example, at 90 knots you will lose about 9 knots in order to climb 100 ft. At 60 knots you will lose 18 knots to climb 100 ft. Another advantage of a faster approach speed is that it lets you glide further in the event of engine failure. (You'd still want to slow down to best glide speed, but you'd gain more altitude in the process.) Since you have no choice about altitude during an ILS approach, adding kinetic energy is the only way to increase your glide range. --Gary |
#10
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In article eMvPb.97683$5V2.322914@attbi_s53,
"Gary Drescher" wrote: Since you have no choice about altitude during an ILS approach, adding kinetic energy is the only way to increase your glide range. That's not really true. You can't go below the GS, but nothing says you can't fly the entire approach above the GS. There's nothing illegal or inherently unsafe about flying the ILS 1 or 2 dots high. You wouldn't want to do it in a jet, but in a spam can it's perfectly reasonable. |
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