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 5th Apr 2011, 04:56 #1 (permalink) Thread Starter   Join Date: Mar 2005 Location: the left seat Posts: 9 Parallel Runways Here's a purely academic question folks What is the mandatory minimum separation distance between parallel runways? Is there a minimum requirement for the thresholds to be staggered as well? Appreciate any input or references. Cheers
 5th Apr 2011, 05:05 #2 (permalink) Join Date: Nov 2004 Location: on earth Posts: 34 Yes there are minimum distances to be respected but I don't have the numbers. I am sure of this because that's the main problem in DXB where they have 2 huge parallel runways and even staggered BUT not enough to be used as independent parallel runways. So they have to respect some separation between landing aircraft on one runway and aircraft taking off from the parallel one... You should find your answer somewhere in the ICAO document where the criteria for parallel runway operation must be specified.
5th Apr 2011, 06:13   #3 (permalink)

Join Date: Aug 2009
Location: Either down at the pointy end or up in the crew rest...
Posts: 489
ICAO merely has recommendations regarding this issue, quoting from Annex 14 Volume 1 here:
Quote:
 1035m for independent parallel approaches 915m for dependent parallel approaches 760m for independent parallel departures 760m for segregated parallel operations except that: a) for segregated parallel operations the specified minimum distance -may be decreased by 30m for each 150 m that the arrival runway is staggered toward the arriving aircraft, to a minimum of 300m -should be increased by 30m for each 150 m that the arrival runway is staggered away from the arriving aircraft b) for independent parallel approaches, combinations of minimum distances and associated conditions other than those specified in the PANS-ATM (Doc 4444) may be applied when it is determined that such combinations would not adversely affect the safety of aircraft operations
The 'staggering' clause was the reason that Frankfurt tried using '26L' in parallel to 25R, displacing the actual threshold of 25L to allow for shorter separation... They gave it up though, too much fuzz.

 5th Apr 2011, 12:40 #4 (permalink) Thread Starter   Join Date: Mar 2005 Location: the left seat Posts: 9 Parallel runways STBYRUD Thanks a ton.
 8th Apr 2011, 05:56 #5 (permalink) Join Date: Apr 2004 Location: UK Posts: 823 For ILS/PRM and LDA/PRM approaches the minimum distance between runways is 750 ft. Have a look at SFO 28L and R, the separation there must be close to the minimum and there is virtually no threshold stagger between the two runways.
 8th Apr 2011, 08:58 #6 (permalink) Thread Starter   Join Date: Mar 2005 Location: the left seat Posts: 9 Parallel Runways Will check. thanks!
 8th Apr 2011, 11:55 #7 (permalink) Join Date: Feb 2000 Location: 500 miles from Chaikhosi, Yogistan Posts: 3,198 FWIW, Calcutta, 150m apart, but staggered 1400m. (not that India is necessarily the best example of ICAO-ness )