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United_fan
Posts: 6382
Joined: Fri Nov 24, 2000 11:11 am

Heavy Mexicana 75 & Alt Lites On WN?

Thu Oct 24, 2002 11:19 pm

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?
Champagne For My Real Friends,and Real Pain For My Sham Friends
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 12:52 am

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
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 12:56 am

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...
none
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 12:58 am

Beat me to it...

It doesn't have to be a widebody to be heavy...
none
 
ThirtyEcho
Posts: 1409
Joined: Tue Jan 01, 2002 1:21 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 1:12 am

Anybody can have alternate-flashing landing lights; they are growing quite common as retrofits on GA aircraft, especially.
 
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United_fan
Posts: 6382
Joined: Fri Nov 24, 2000 11:11 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 2:25 am

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.
Champagne For My Real Friends,and Real Pain For My Sham Friends
 
Guest

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 8:47 am

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
 
EssentialPowr
Posts: 1646
Joined: Wed Sep 06, 2000 10:30 pm

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 9:35 am

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-
 
ERFly
Posts: 162
Joined: Thu Aug 22, 2002 12:47 pm

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 10:21 am

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.
 
covert
Posts: 1507
Joined: Sun Oct 21, 2001 1:02 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Fri Oct 25, 2002 10:30 am

Thank you for that EssentialPowr...
none
 
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United_fan
Posts: 6382
Joined: Fri Nov 24, 2000 11:11 am

RE: Heavy Mexicana 75 & Alt Lites On WN?

Mon Oct 28, 2002 1:22 am

Thanks for all the info . I just never saw alternating landing lites before.
Champagne For My Real Friends,and Real Pain For My Sham Friends

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