Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Packing Them In At LHR  
User currently offlineGlom From United Kingdom, joined Apr 2005, 2818 posts, RR: 10
Posted (8 years 1 month 5 days 13 hours ago) and read 2886 times:

When we landed at LHR last night, as we taxiied, I watched the line of incoming aircraft and noticed how closely spaced they were. I timed the delay between two landings, the first an ERJ and the second an A319. It was probably only about a minute. According to my air law book, the wake turbulence space for medium on medium is 2 minutes.

Are LHR breaking the law?

7 replies: All unread, jump to last
 
User currently offlineEgmcman From United Kingdom, joined Jun 2005, 898 posts, RR: 8
Reply 1, posted (8 years 1 month 5 days 12 hours ago) and read 2809 times:

ATC follow strict procedures know what they are doing. Any violations are reported.

User currently offlineScbriml From United Kingdom, joined Jul 2003, 12569 posts, RR: 46
Reply 2, posted (8 years 1 month 5 days ago) and read 2619 times:
Support Airliners.net - become a First Class Member!

Would an ERJ really count as "medium"?


Time flies like an arrow, but fruit flies like a banana!
User currently offlineScbriml From United Kingdom, joined Jul 2003, 12569 posts, RR: 46
Reply 3, posted (8 years 1 month 4 days 23 hours ago) and read 2538 times:
Support Airliners.net - become a First Class Member!

OK, after a little research, I think you're confusing take-off and landing separation.

According to this document (I appreciate it's a few years old now), landing separation is measured in nm while take-off separation is specified in minutes.
http://www.chirp.co.uk/new/Downloads...rbulence%20separation%20landing%22

Certainly, having spent many hours watching landings at LHR, there's no way there's ever much more than a minute between them at busy times. Think about it - if landings were separated by two minutes, only 30 planes an hour could land at LHRcrazy 



Time flies like an arrow, but fruit flies like a banana!
User currently offlineBa757gla From United Kingdom, joined Mar 2006, 760 posts, RR: 2
Reply 4, posted (8 years 1 month 4 days 23 hours ago) and read 2521 times:

an erj would still kick up a load of thrust ! would that be BDs ERJs?

User currently offlineMRURUN From United Kingdom, joined Aug 2006, 155 posts, RR: 0
Reply 5, posted (8 years 1 month 4 days 21 hours ago) and read 2409 times:

Couldve been LG too!

User currently offlineCloudyapple From Hong Kong, joined Jul 2005, 2454 posts, RR: 10
Reply 6, posted (8 years 1 month 4 days 18 hours ago) and read 2248 times:

Quoting Glom (Thread starter):
When we landed at LHR last night, as we taxiied, I watched the line of incoming aircraft and noticed how closely spaced they were. I timed the delay between two landings, the first an ERJ and the second an A319. It was probably only about a minute. According to my air law book, the wake turbulence space for medium on medium is 2 minutes.

Are LHR breaking the law?

At Heathrow we do not use time based spacings for arrivals. Director clears aircraft onto the ILS at the correct distance based spacings. These spacings are theoretically those written in the book - which are -
HH - Heavy / UM - Upper Medium / LM - Lower Medium / SS - Small / LL - Light

R - Radar Separation 3Nm / Reduced final approach spacing = 2.5Nm

1Nm = 1852m








..
Follower
..HHUMLMSSLL
LeaderHH45568
UMR3446
LMRRR35
SSRRRR3
LLRRRRR


Anything marked R will be 3Nm or given the right conditions during the day 2.5Nm.

Also important is aircraft have to maintain 160kt until 4DME to keep the approach spacing constant, afterwhich they can reduce to final approach speed. But having said that each aircraft type has a different speed profile. So some maybe able to do 160kt but some like the B773 (usually the stretched aircraft) will be a bit faster and some will be a bit slower. The final approach spacing will be adjusted slightly to account for the slight speed differentials.

If you time it again and measure that against the appraoch spacing chart, each Nm equates to approximately 23-25sec.

[Edited 2006-08-21 17:19:43]

[Edited 2006-08-21 17:21:33]

[Edited 2006-08-21 17:22:25]


A310/A319/20/21/A332/3/A343/6/A388/B732/5/7/8/B742/S/4/B752/B763/B772/3/W/E145/J41/MD11/83/90
User currently offlineChristeljs From United Kingdom, joined Jun 2005, 533 posts, RR: 4
Reply 7, posted (8 years 1 month 4 days 15 hours ago) and read 2169 times:

When I was at LHR in June, I was planespotting along the fence when I saw an A320 land, and a B773 right behind, and I mean right behind! The B773 managed to descent the last feet down sooo slowly so that it more or less touched down 4 seconds after the A320 had vacated. I was very fascinated and thought to myself "that was really, really good". It was actually so close behind I thought any moment this 777 is going to have a go around.


Christel Sinsen Photography
Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
Question About OS Check-in At LHR posted Mon Oct 10 2005 20:16:08 by HS748
Swiss And Self Check-in At LHR posted Sun Feb 6 2005 15:54:22 by Sabena 690
AA First Self-Service Check-In At LHR posted Wed Jul 14 2004 03:34:13 by ScottysAir
JetBlue -- Packing Them In posted Wed Jul 16 2003 01:54:23 by Travelin man
Observation Deck Included In T5 At LHR? posted Sat Apr 22 2006 00:56:39 by Springbok295
Designated Check In And Departure Lounge At LHR posted Sat Jan 7 2006 08:25:29 by AirCanada014
Spotting At LHR In Year 2025. posted Fri Nov 4 2005 23:03:19 by Speedmarque
BMI Check In Closing Times At LHR.. posted Thu Jul 14 2005 21:32:52 by Richardw
QFs VH-OEJ Always In The Middle Of Nowhere At LHR? posted Thu Aug 26 2004 19:54:55 by LoungeLover
SQ Earliest Check-in Time At LHR posted Thu Aug 19 2004 13:48:21 by Star_world