Herc Jerk
29th Mar 2004, 01:41
Transitioning from the Herc to 737NG and while studiously studying the fuel system chapter i found that i had finished the chapter without a hint of dump pumps, dump valves, or even dump masts. At this stage my brain kicked into high gear and, by a simple process of deduction, i concluded that there is no fuel dumping capability on the 737... smart huh?
Why not? Or then, why?
Both acft are 2nd segment limited under certain conditions.
Both can TOFF well in excess of their MLW.
There is the provision for "overweight landings" in the 73, but, although not said in so many words, there are landing graphs for the Herc that cover all weights up to MTOW. In the event of an over weight landing an inspection would be required (i assume, but am not trained in the arts of fixing), the same as the 73.
In the Herc, during every TOFF near to 155,000lbs you would invariably find the FE's hands hovering near those dump pumps. BUT our 2nd seg WAT limit was not predicated on this.
So what requires the installation of a dump system?
Both these acft are very similar in weight, the -700 is the closest approx to the Herc.
Is it a 4 eng vs 2 eng thing?
Has it got to do with the fact that the Herc can carry so much of it's payload as fuel (almost 65000lbs/14hrs of fuel w/externals)?
Or is it more so old technology/added luxury (?!)/military hold over...?
As a final question for interests sake, what other large acft do/don't have fuel dumping?
HJ
Why not? Or then, why?
Both acft are 2nd segment limited under certain conditions.
Both can TOFF well in excess of their MLW.
There is the provision for "overweight landings" in the 73, but, although not said in so many words, there are landing graphs for the Herc that cover all weights up to MTOW. In the event of an over weight landing an inspection would be required (i assume, but am not trained in the arts of fixing), the same as the 73.
In the Herc, during every TOFF near to 155,000lbs you would invariably find the FE's hands hovering near those dump pumps. BUT our 2nd seg WAT limit was not predicated on this.
So what requires the installation of a dump system?
Both these acft are very similar in weight, the -700 is the closest approx to the Herc.
Is it a 4 eng vs 2 eng thing?
Has it got to do with the fact that the Herc can carry so much of it's payload as fuel (almost 65000lbs/14hrs of fuel w/externals)?
Or is it more so old technology/added luxury (?!)/military hold over...?
As a final question for interests sake, what other large acft do/don't have fuel dumping?
HJ