I suspect that the full length of the runway will be strengthened to accommodate the high PCN’s of the P-8’s, E7’s & KC-30’s. The P-3’s had high tyre pressures (190psi) but these newer aircraft will have higher pressure tyres supporting greater weight. The 1,000’ overruns at each end are “full strength“ which the P-3’s used as extra runway when taking off at maximum weight.Three years ago, the budget to upgrade the airstrip on the Cocos (Keeling) Islands was $184 million. Now that cost has more than tripled.www.abc.net.au
There is a cost blow out of the 150m runway extension on Cocos by ~$200m.
I guess its a reminder there are no easy solutions. I would guess extensions by more than 150m would become far more expensive. Referring back to discussions 3 pages ago about airfield extensions.
The Peregrines will be much lighter but, as they have small high pressure tyres, extra runway strengthening will ensure that they do not cause pavement damage.