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What Does Side Step Exactly Mean?  
User currently offlineJulianUK From United Kingdom, joined Apr 2006, 105 posts, RR: 0
Posted (8 years 2 months 1 week 14 hours ago) and read 17138 times:

I was flying an approach to an airport on MS Flight Sim and I kept requesting 8R and air traffic said "fly an 8L approach and side step 8R" - ok but does this happen in real life and when do you actually side step - how far into the approach would this happen? before the 8L ILS or once established?

12 replies: All unread, jump to last
 
User currently offlineAlias1024 From United States of America, joined Oct 2004, 2741 posts, RR: 2
Reply 1, posted (8 years 2 months 1 week 13 hours ago) and read 17126 times:

Yes, this happens in real life. Normally, you would sidestep once you have visually acquired the runway you are sidestepping to. Sidestep procedures are usually used for a couple of reasons. The first would be if one runway had an instrument approach and the other didn't, and the weather required the use of the approach. The other is when spacing breaks down between the aircraft on approach. If the controller has an aircraft on final, but the runway won't be clear, they can ask the aircraft to sidestep to the other runway assuming it won't cause a conflict with other traffic.


It is a mistake to think you can solve any major problems with just potatoes.
User currently offline113312 From United States of America, joined Apr 2005, 569 posts, RR: 1
Reply 2, posted (8 years 2 months 1 week 7 hours ago) and read 17039 times:

A sidestep is always a visual maneuver to landing on an adjacent parallel runway. An airport where this is frequently done is LAX where ILS approaches are normally being conducted to RWY 25L and most of the departures occur on RWY 25R. However, corporate and cargo aircraft frequently taxi out from south of 25L and hold for departures at the approach end. Although many flights can be instructed to taxi accross 25L in preparation for departure on the right, if conditions are favorable (ie spacing, visibility, etc.) the Tower controller may offer a sidestep to the approaching aircraft to change their landing to RWY 25R.

Sometimes, a sidestep is requested or offered to facilitate an easier exit of the runway or taxi route to parking. In any case, at airports with closely spaced parallel runways at which sidesteps can be performed, a minimum altitude is usually published to complete this maneuver.


User currently offlineTimz From United States of America, joined Sep 1999, 6749 posts, RR: 7
Reply 3, posted (8 years 2 months 1 week 4 hours ago) and read 17003 times:

Quoting 113312 (Reply 2):
a minimum altitude is usually published to complete this maneuver.

Published where?


User currently offlineMir From United States of America, joined Jan 2004, 21423 posts, RR: 56
Reply 4, posted (8 years 2 months 1 week 4 hours ago) and read 16996 times:

Quoting Timz (Reply 3):
Published where?

On the approach plate, I'd assume. IIRC, sidesteps use circling minimums.

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineFlyMeARiver From United States of America, joined Jan 2006, 84 posts, RR: 0
Reply 5, posted (8 years 2 months 6 days 10 hours ago) and read 16896 times:

Quoting Mir (Reply 4):
On the approach plate, I'd assume. IIRC, sidesteps use circling minimums.

There have to be published side-step minimums or you can't execute a side-step, per se. Any other procedure where you shoot an approach to one runway and land on another would use circling minimums, whether or not they are parallel and/or next to eachother.


User currently offlineFlyf15 From , joined Dec 1969, posts, RR:
Reply 6, posted (8 years 2 months 6 days 10 hours ago) and read 16872 times:

Although it looks like everyone has pretty much answered the question above, I'll share my story with sidesteps. Last fall at Denver Jeffco (BJC), the main runway, 11L/29R, (and only runway with an ILS) was shut down for roughly 2 months for construction.

We had lots of IFR days and they'd turn on the ILS for 29R, we'd shoot it, and then once visual, sidestep over to the smaller 29L. Occasionally we'd have to circle to 11R, but thats another story all together. Although not as great due to the higher minimums, it worked out well.


User currently offlineMir From United States of America, joined Jan 2004, 21423 posts, RR: 56
Reply 7, posted (8 years 2 months 6 days 9 hours ago) and read 16862 times:

Quoting FlyMeARiver (Reply 5):
There have to be published side-step minimums or you can't execute a side-step, per se. Any other procedure where you shoot an approach to one runway and land on another would use circling minimums, whether or not they are parallel and/or next to eachother.

You may say "circle" instead of "side-step", but they are for all intents and purposes the same thing. I've never actually seen published side-step minimums.

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineFlyMeARiver From United States of America, joined Jan 2006, 84 posts, RR: 0
Reply 8, posted (8 years 2 months 6 days 8 hours ago) and read 16846 times:

Quoting Mir (Reply 7):
I've never actually seen published side-step minimums.

They're published on pretty much every approach where the sidestep is ever likely to be used. The ILS 4R at EWR and the ILS 33R at IAH are just 2 examples off the top of my head.


User currently offlineOly720man From United Kingdom, joined May 2004, 6674 posts, RR: 11
Reply 9, posted (8 years 2 months 5 days 23 hours ago) and read 16772 times:

Not sure this was a side step or a runway not clear, but I was once at JFK and Concorde was on approach for 31L and suddenly turned to make an approach on 31R. I think it was too close to the airport and had to do a go around. Noisy!


wheat and dairy can screw up your brain
User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 10, posted (8 years 2 months 5 days 19 hours ago) and read 16733 times:

Just a note from our ops man...The runways cannot be more than 1200' apart. You may/can be cleared for the ILS with the sidestep but mins will be the published side step mins OR circling mins will be used. You are expected to commence the sidestep maneuver as soon as possible after the runway environment is in sight. At MDA if the runway environment is not in sight you will fly the published missed app. proced. for the primary runway.

User currently offlineFlyf15 From , joined Dec 1969, posts, RR:
Reply 11, posted (8 years 2 months 11 hours ago) and read 16535 times:

Quoting Mir (Reply 7):
You may say "circle" instead of "side-step", but they are for all intents and purposes the same thing. I've never actually seen published side-step minimums.

Side step minimums are definitely out there. They let you get down below circling minimums, but not as low as the ILS can take you to the original runway. Here is the approach chart for the approach I talked about in reply 6.

http://204.108.4.16/d-tpp/0604/05612I29R.PDF

As you can see, minimums in AGL for a category A aircraft are:

ILS: 200ft
LOC: 305ft
Sidestep: 295ft
Circling: 510ft

The sidestep can get you lower than the LOC approach to the original runway can. They're really great to have in some situations.


User currently offlineIAHFLYR From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 12, posted (8 years 1 month 4 weeks 14 hours ago) and read 16407 times:

[quote=Mir,reply=7]You may say "circle" instead of "side-step", but they are for all intents and purposes the same thing. I've never actually seen published side-step minimums.

If the approach has both side-step and circling mins on the chart the clearance should be different for each that is expected. IAH ILS Runway 15R side-step Runway 15L or RNAV Runway 15R cirlcle Runway 9 will be issued in the clearance. Technically if the weather at the airport is less than VFR then the approach clearance must state what particular operation to be flown, if the tower wants the aircraft to side-step in an less than VFR weather, they must reclear the approach if the original clearance was not including the side-step part and that must be done outside of the final approach fix.



Any views shared are strictly my own and do not a represent those of any former employer.
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