My WebLink
|
Help
|
About
|
Sign Out
Home
Airport Highlights 2008 0502
CityHall
>
City Clerk
>
City Council
>
Committees
>
Airport Committee
>
Airport Highlights 2008 0502
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
5/16/2008 4:49:30 PM
Creation date
5/16/2008 4:49:30 PM
Metadata
Fields
Template:
CM City Clerk-City Council
CM City Clerk-City Council - Document Type
Committee Highlights
Document Date (6)
5/2/2008
Retention
PERM
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
15
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Fuel dumping <br />From Wikipedia, the free encyclopedia <br />Fuel dumping from an aircraft is used to lighten the aircraft's <br />weight in certain emergency situations. Fuel is typically jettisoned <br />before a return to the airport shortly after takeoff, or before landing <br />at an airport short of the intended destination. <br />Although the landing gear has been designed to allow the aircraft to <br />safely land at maximum takeoff weight, dumping fuel reduces the <br />landing weight and therefore minimizes the risks associated with <br />higher speed landings. <br />Contents <br />^ 1 Aircraft fuel dump <br />^ 2 Dump-and-burn <br />^ 3 See also <br />^ 4 External links <br />Aircraft fuel dump <br />Aircraft have two major types of weight limits: the maximum structural takeoff weight and the maximum structural <br />landing weight, with the maximum structural landing weight always being the lower of the two. This allows an aircraft <br />on a normal, routine flight to take off at the higher weight, consume fuel en route, and arrive at a lower weight. (There <br />are other variables involving takeoff and landing weights, but they are omitted from this discussion for the sake of <br />simplicity.) <br />It is the abnormal, non-routine flight where landing weight can be an issue. If a flight takes off at the maximum <br />structural takeoff weight and then faces a situation where it must return to the departure airport (due to certain <br />mechanical problems, or a passenger medical issue), there will not be time to consume the fuel meant for getting to the <br />original destination, and the aircraft maybe over the maximum structural landing weight to land back at the departure <br />point. <br />As jets began flying with U.5. airlines in the late 1950s and early 1960s, the FAA rule <br />in effect at the time mandated that if the difference between an aircraft's maximum <br />structural takeoff weight and its maximum structural landing weight was greater than <br />105%, the aircraft had to have a fuel dump system installed. Accordingly, aircraft such <br />as the Boeing 707 and 727 and the Douglas DC-8 had fuel dump systems. Any of <br />those aircraft needing to return to a takeoff airport above the maximum structural <br />landing weight would simply jettison an amount of fuel sufficient to reduce the <br />aircraft's total weight to below that maximum structural landing weight limit, and then <br />land. <br />Fuel dumping point of an <br />A340-311 <br />During the 1960s, Boeing introduced the 737, and Douglas the DC-9, the original <br />models of each being for shorter routes; the 105% figure was not an issue, thus they <br />had no fuel dump systems installed. During the 1960s and 1970s, both Boeing and Douglas "grew" their respective <br />aircraft as far as operational capabilities were concerned via Pratt & Whitney's development of increasingly powerful <br />variants of the JT8D engines that powered both aircraft series. Both aircraft were now capable of longer duration <br />flights, with increased weight limits, and complying with the existing 105% rule became problematic due to the costs <br />RAAF F-111 aircraft performing a fuel dump-and- <br />burn procedure, where the fuel being dumped is <br />ignited, intentionally, using the plane's afterburner <br />'~ <br />
The URL can be used to link to this page
Your browser does not support the video tag.