問題になっているのは俗に言うAPUからの排気であり、F135やB型のノズルからの排気とは無関係。 F-35の場合auxiliary power system、 emergency power system、environmental control等を 統合したintegrated power package (IPP)を搭載しているが、今回問題になっているのはIPPと その排気。>943の記事の対策でノズルを楕円にするというのはF135のノズルではなくIPPのノズル。
F-35B versions of the JSF have integrated power packages (IPP) that point down towards the pavement (the F-35C IPP points upwards and is of no concern for the pavements). The current version of the IPP in those two aircraft generates an exhaust under Burn mode which results in pavement surface temperatures in excess of those generated by the F/A-18 (and B-1) auxiliary power unit (APU). The IPP is always on, and in the Burn mode whenever the aircraft is stopped. This IPP exhaust will result in accelerated decay of both asphalt and concrete: for asphalt it could result in very quick rutting and accelerated oxidation, and for concrete it could result in scaling after a few months or years, depending on exposure time, exposure cycles, wind, precipitation, ambient temperature, etc. Therefore, for F-35B aircraft:
- The runway ends shall be concrete - Holdshorts on taxiways shall be concrete - Parking aprons be shall be concrete - The concrete shall be heat resistant to an exhaust similar to that of an F/A-18 APU, per UFGS 32 13 13.03 (Airfields and Heavy-Duty Concrete Pavement Less Than 10000 Cubic Yards) or Air Force Engineering Technical Letter ETL 02-7.