National is a Index C airport while Dulles is a Index E airport. The FAA has requirements of how many units and what water, foam and dry chem must be carried and how many units must be able to make it to the midpoint of the furthest runway within so many minutes to remain certified at that index.
To meet Index E certification Dulles needs to be able to get three units to the midpoint of the furthest runway within that period of time....I forget what it is. To do so they have two Oshkosh ARFF units at Station 302 and 2 at Station 304. To allow the third unit to make it to the midpoint of any of the runways and meet certification they use Twin Agent Unit 302.
A clarification to my last post...the new reserve ARFF unit at Dulles is Foam 345. Station 304 runs the twin to Foam 326 and Foam 352 the other Striker at Dulles (without Snozzel).
To meet Index E certification Dulles needs to be able to get three units to the midpoint of the furthest runway within that period of time....I forget what it is. To do so they have two Oshkosh ARFF units at Station 302 and 2 at Station 304. To allow the third unit to make it to the midpoint of any of the runways and meet certification they use Twin Agent Unit 302.
A clarification to my last post...the new reserve ARFF unit at Dulles is Foam 345. Station 304 runs the twin to Foam 326 and Foam 352 the other Striker at Dulles (without Snozzel).
Dave McClung
Arden Hills, Minnesota but....
my heart is also back in Northern VA, especially Alexandria.
All pictures are taken by me and subject to copyright.
No picture taken by me may be copied or linked without my
express permission.
Arden Hills, Minnesota but....
my heart is also back in Northern VA, especially Alexandria.
All pictures are taken by me and subject to copyright.
No picture taken by me may be copied or linked without my
express permission.
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