Crossing a mixed mode runway
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Crossing a mixed mode runway
Dear All,
I am trying to find examples of airports where aircraft regularly and routinely taxi across a mixed mode runway.
All the examples that come to my mind (Heathrow, Manchester) are of single mode runways being crossed.
If there are such cases (crossing of a mixed mode runway), what kind of procedures do you implement - how big a gap do you create to get an aircraft across, and how much hourly capacity do you lose due to crossings?
Would be grateful for any suggestions.
NaL
I am trying to find examples of airports where aircraft regularly and routinely taxi across a mixed mode runway.
All the examples that come to my mind (Heathrow, Manchester) are of single mode runways being crossed.
If there are such cases (crossing of a mixed mode runway), what kind of procedures do you implement - how big a gap do you create to get an aircraft across, and how much hourly capacity do you lose due to crossings?
Would be grateful for any suggestions.
NaL
Why would you need a bigger gap than normal ADAD? Surely the crossing can be achieved between the time the arrival passes the crossing point and it vacating the runway. In the event that your crossing point is so close to the exit of the runway that more time is required then quantify how much extra time. It should not be difficult to equate this extra time with extra gap requirement. If you need an extra mile 8 times an hour I would suggest you will loose a movement or three per hour from your capacity. If this is unacceptable to your airport then it needs to be balanced against the cost providing a runway crossing point closer to the threshold so that no extra time is required.
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I've done thousands of mixed mode crossings. It's experience which makes it work. So many variables - types of aircraft, companies, weather, wind, day or night, availability of ground radar, position at which the crossing takes place, etc.
Pssss..What's an ADAD?
Pssss..What's an ADAD?
ADAD = more useful abbreviation than the one for Buff, Blue, Buff, Blue...
Stansted has regular crossings, both towed and under power. Pretty much all the non-airline movements park on the northside. Only the southside allows entry at the 22 threshold, and some of those private aircraft are Big.
Stansted has regular crossings, both towed and under power. Pretty much all the non-airline movements park on the northside. Only the southside allows entry at the 22 threshold, and some of those private aircraft are Big.
I've done thousands of mixed mode crossings.
Pssss..What's an ADAD?
I've had many R/W xings at EGPD. No special procedures. Hold the xing a/c until there is a gap & then cross when able. No extra spacing, no reduction in movements. If there was a delay, it was to the xing a/c.
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Aha.. ADAD! Reminds me of an old mate, now long since passed. When he warned in traffic to the Air Man he would say "Speedbird 123, Air France 804, Gold Alpha Papa, Clipper one..." When the Air Man said "I don't have a Golf Alpha Papa", my chum, would say "You asked for a GAP..." He caught us out every time. (Hope you're smiling Colin).
Happens quite often at NZWN, with military, ga, air ambulance and some occasional freight ops from the western apron. Any aircraft unable to take intersection departures has to cross the runway to taxi full length.
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Dear All,
Just a quick than you for the replies, all useful stuff, €€€€€€ to everyone who posted!
Stansted and Aberdeen both good examples, although perhaps neither operates at peak runway capacity, so gaps for crossings probably frequently available.
Are there any major hub airports that would have this issue that you know of?
Cheers to all
Just a quick than you for the replies, all useful stuff, €€€€€€ to everyone who posted!
Stansted and Aberdeen both good examples, although perhaps neither operates at peak runway capacity, so gaps for crossings probably frequently available.
Are there any major hub airports that would have this issue that you know of?
Cheers to all
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I used to fly in and out of Lambert Field STL on a very frequent basis. Its less busy than it was in the days of TWA, but the choreography of getting 5 aircraft at a time across 09L or 27R between incoming and or outgoing flights was fascinating and needed a high degree of concentration and professionalism by all concerned.
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In the old days of 23L at Heathrow, when winds were strong we would operate single runway with 3nm spacing... and get the odd one across. There's nothing a 50 kt wind won't fix.
