Who's Online

We have 1339 guests online

Live Traffic Feed

Life in the Skies

'A Local Bestseller!'

What Tony says
(See here)
and Book Launch video here
What others say

Les Posen

Yvonne Lee

Louisa Lim & Allan Koay

Aireen Omar, Asran & Bo Lingam

38 Readers' Comments
(See here)

Get an autographed copy here

AMAZON.COM  -  To Order, please Click here 

(eBook) Kindle edition - please Click here

Latest Comment

A successful SIA Cad
If anyone could answer to Imene's query that would

Can I be a pilot if
Anybody that has seizures can be a permanent stude

A successful SIA Cad
the deadline i guess it's the end of this februry,

Singapore Airlines P
Hello captain Lim , I am Ray . I would like

What are the eyesigh
sir i have -0.25 in my right eye and 0.75 in left

Spontaneous Pneumoth
I'm not a doctor or anything, @chinmay, so I can't

What are the cruisin
The idea that the earth is spinning is plain bulls

Singapore Airlines C
Hello Captain Lim, I am an Indian citizen, Engine

Spontaneous Pneumoth
my grandmother is 70 yrs. old also sugar patient.

Does a jet aircraft
From what I understood Flat earthers are just uned

Paperback Version

 For Local Availability - Check Here
Home > Air Turbulence > Hurt by Wake Turbulence
Hurt by Wake Turbulence
Weather - Air Turbulence
Saturday, 13 October 2012 16:24

Airbus A380 Wake Turbulence

Dear Capt Lim,

What does weighted turbulence means?

I am a Flight Attendant who got hurt during turbulence and the Captain's report used that term.

Can you tell me more about it?


Hi Diana,

I have not heard of this term ‘weighted turbulence’ but I believe you probably misheard it. It is more likely ‘wake turbulence’ that your captain was referring to.

Wake turbulence is not caused by nature but created by another aircraft flying in front. Generally, any aircraft flying in front will cause disturbance to the airflow behind that ranges from minor to severe in intensity - the bigger the airplane ahead, the greater the wake turbulence.

For instance, air traffic controller will impose a separation between each category of aircraft taking off or landing on the runway based on the following FAA regulations:-

• Super - A separate designation that currently only refers to the Airbus A380.
• Heavy - Aircraft capable of takeoff weights of 140,000 kg or more.
• Large - Aircraft of more than 19,000 kg
• Small – Aircraft of 19,000 kg or less.

So an aircraft of a lower category must not be allowed to take off less than two minutes behind an aircraft of a higher category. If the following aircraft does not start its take-off roll from the same point as the preceding aircraft, this is increased to three minutes.

Additionally there are also distance separation between the aircraft as below:-

Preceding aircraft Following aircraft  Minimum radar separation
Super Super 4 NM
  Heavy 6 NM
  Large 7 NM
  Small 8 NM
Heavy Heavy 4 NM
  Large 5 NM
  Small 6 NM
Large Small 5 NM

Sometimes a plane can encounter wake turbulence during the cruise, climb or descent at high level due to the changing winds at the particular level.

On November 12, 2001, an American Airlines Airbus A300 with 267 passengers crashed shortly after take-off from John F. Kennedy International Airport, New York.

The Airbus A300 took off immediately after a Japan Airlines Boeing 747-400 on the same runway. It flew into the larger jet's wake turbulence.

Investigation revealed that the first officer made an error in handling the plane during the turbulent air encounter. As a result, his over controlling of the rudders stressed the aircraft's fin (vertical stabilizer) and eventually snapped it off entirely, causing the aircraft to crash.

PS. To check for any latest updates or postings, you can follow my new Twitter at @CaptKHLim

Wake Turbulence Avoidance

Caution! Wake Turbulence


TrackBack URI for this entry

Comments (0)

Subscribe to this comment's feed

Write comment

smaller | bigger


Paperback Version

 For Local Availability - Check Here

Recommended By..


'A Local Bestseller!'

Recommended by

Patrick Smith
Boston USA

Capt Meryl Getline
ex-United Airlines USA

Capt Doug Morris
Canadian Airlines

Capt  Robert J Boser
ex-United Airlines USA

38 Readers' Comments
(See here)

Get an autographed copy here

AMAZON.COM  -  To Order, please Click here 

(eBook) Kindle edition - please Click here

View Book Launch video here

Follow me


Like What You Read?

If you like what you read, more stories are found in my book LIFE IN THE SKIES (Preview here) and you can purchase a copy here. To check for any latest updates or postings, you can follow my Twitter at @CaptKHLim or Facebook here

MH 370 Interviews

Click here to View

10 Most Popular Posts

Disclaimer | Privacy
2004 - 2011 © AskCaptainLim.com | Site Concept by eQuilec.com