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Heavy Mexicana 75 & Alt Lites On WN?  
User currently offlineUnited_Fan From United States of America, joined Nov 2000, 7440 posts, RR: 7
Posted (11 years 8 months 3 weeks 3 hours ago) and read 2026 times:

I noticed on my last trip that ATC classifies Mexicana 757's as heavies. Is it because they operate to hot & high airports? Also , some Southwest 737's have alternating landing lites. Are they the only ones ? I thought I was seeing things?


'Empathy was yesterday...Today, you're wasting my Mother-F'ing time' - Heat.
10 replies: All unread, jump to last
 
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1338 posts, RR: 27
Reply 1, posted (11 years 8 months 3 weeks 2 hours ago) and read 1977 times:

Ohh know not this question again (Check this link to see how long this argument lasted - http://airliners.net/discussions/tech_ops/read.main/11570/)

The B757 is classified as a heavy for ATC separation for wake turbulence purposes. Some people are confusing this term used for ATC separation purposes as the definition of a heavy aircraft.

Below is an excerpt from a breakdown of an ICAO International flightplan:

Item 9: Aircraft type and wake turbulence category/number
Wake turbulence category— Indicate wake turbulence intensity created by
the aircraft :
H — Heavy (aircraft with a maximum certificated takeoff weight of
136,000 kg/300,000 lb or more).
M — Medium (aircraft with a maximum certificated takeoff weight of
less than 136,000 kg/300,000 lb, but more than 7,000 kg/15,500 lb).
L—Light (aircraft with a maximum certificated takeoff weight of 7,000
kg/15,500 lb or less).


The B757 is has a *MTOW of 255,000 lbs, so obviously it falls short of being a heavy. But because of the wake turbulence that it creates (or so they say), the B757 CAN BE CONSIDERED the equivalent to a heavy at times.

http://www.boeing.com/commercial/757family/technical.html


User currently offlineCovert From Ghana, joined Oct 2001, 1449 posts, RR: 2
Reply 2, posted (11 years 8 months 3 weeks 2 hours ago) and read 1983 times:

A heavy aircraft, as the FAA is concerned is an aircraft above 250,000 pounds or a generator of tremendous wake turbulence, the 757 with its big wings has one hell of a wake.

And Airbuses are the aircraft I have heard have alternating landing lights....I wonder what the knowledgable crew has to say...



thank goodness for TCAS !
User currently offlineCovert From Ghana, joined Oct 2001, 1449 posts, RR: 2
Reply 3, posted (11 years 8 months 3 weeks 1 hour ago) and read 1977 times:

Beat me to it...

It doesn't have to be a widebody to be heavy...



thank goodness for TCAS !
User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1643 posts, RR: 1
Reply 4, posted (11 years 8 months 3 weeks 1 hour ago) and read 1971 times:

Anybody can have alternate-flashing landing lights; they are growing quite common as retrofits on GA aircraft, especially.

User currently offlineUnited_Fan From United States of America, joined Nov 2000, 7440 posts, RR: 7
Reply 5, posted (11 years 8 months 3 weeks ago) and read 1959 times:

I was wondering about 757 heavies because the UA 757 I was on wasn't called UA230 Heavy. And I couldn't think of what a/c Mexicana had that was a heavy until I saw the 757 when we turned @ ORD.


'Empathy was yesterday...Today, you're wasting my Mother-F'ing time' - Heat.
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 6, posted (11 years 8 months 2 weeks 6 days 18 hours ago) and read 1742 times:

United Fan -
xxx
In the United States (US only) aircraft 300,000 lbs and the 757 are required to add "HEAVY" at the end of their call sign (flight number) when in contact with approach control, departure control and control towers - that is when they are in airspace of mixed sizes of traffic...
xxx
If you were hearing your xxx flight not called HEAVY, is because they were talking to enroute frequencies, which is not, approach, tower or deparure... Further, if you are overseas - HEAVY is not used...
xxx
Flashing lights is an option that any planes can get...
xxx
(s) Skipper


User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 7, posted (11 years 8 months 2 weeks 6 days 17 hours ago) and read 1739 times:

Actually, Covert, the 757 is highly wing loaded, compared to other airliners, meaning it has Less wing area to support its weight...therefore a more severe wake.

cheers-


User currently offlineERFly From United States of America, joined Aug 2002, 164 posts, RR: 0
Reply 8, posted (11 years 8 months 2 weeks 6 days 16 hours ago) and read 1737 times:

Most pilots of B757-200s don't use the HEAVY after their callsign. It seems to be assumed and they get 5 miles.

However, the new B757-300 is considered a heavy aircraft and the "Heavy" designation has to be used with the callsign.

FYI - When pilots are talking to ARTCC (Center), the omit the heavy call, everyone gets 5 miles up high. Its only used in the terminal area.


User currently offlineCovert From Ghana, joined Oct 2001, 1449 posts, RR: 2
Reply 9, posted (11 years 8 months 2 weeks 6 days 16 hours ago) and read 1727 times:

Thank you for that EssentialPowr...


thank goodness for TCAS !
User currently offlineUnited_Fan From United States of America, joined Nov 2000, 7440 posts, RR: 7
Reply 10, posted (11 years 8 months 2 weeks 4 days 1 hour ago) and read 1652 times:

Thanks for all the info . I just never saw alternating landing lites before.


'Empathy was yesterday...Today, you're wasting my Mother-F'ing time' - Heat.
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