Aviation Week
reports that
small-diameter bomb clearance for the
F-35 will be pushed beyond Block 3 to Block 4 at the end of the decade. There are several important points to bring up about this decision.
When the Joint Strike Fighter contract was awarded to Lockheed Martin in 2001 which became today's F-35, this marked the beginning of the System Development and Demonstration phase (SDD). The end of SDD would mean a complete Block 3 aircraft would be ready so that the next phase, Full Rate Production (FRP) could happen.
The small-diameter bomb (SDB) was created not so much as to reduce collateral damage in the time of its creation of useless conterinsergecy warfare but to provide aircraft the ability to carry more precision weapons for destruction of enemy air defenses and various other ground targets. It was determined that there were vast kinds of target sets
that could be killed with small warheads and that not every target needed a 2000, 1000, or 500-pound air-to-ground weapon to kill it. Today's F-15E can carry several SDBs compared to other kinds of air-to-ground weapons. The F-22 can carry 8 of these inside its small bay.
SDB also has the penetration quality of the 2000-pound steel-pointy-tip
BLU-109 bomb unit which is usually mated to precision-guided kits.
The SDB has a fold out wing to provide increased range. As a low-treat-war weapon it is useless because there are so many other cheaper options available for low collateral work. That and the fact that the long time of flight of the weapon even at short range, is unacceptable for close air support work.
In 2006, the U.S. Department of Defense released a
contract (4th paragraph) that would add the SDB to the list of air-to-ground weapons cleared (for USAF) F-35A's by the end of F-35 System Development and Demonstration (SDD) phase. This same contract also removed the Wind Corrected Munitions Despenser (for example CBU-105 which is used to deploy
BLU-108 "skeets") from the list of weapons to be cleared by the end of F-35 SDD.
Because of development trouble, this same contract removed external fuel tanks from the F-35's end of SDD requirement. In the following year, briefings to Norway showed exernal fuel tank capability with the F-35 even after the contract had been released removing them from SDD. Later, Lockheed Martin briefings hawked this as an advantage, "Look, the F-35 is so advanced, it doesn't need external fuel tanks".
The marketing crew and faithful followers--on most days it is hard to tell the difference--continue to shed light on various hopes and dreams for the program. Notional block 4, 5 and 6 efforts (post SDD) show all kinds of things. Block 4 is now the Blue-Sky-Marketing gimmick used to dump things that should have been figured out earlier. Drag-chutes for the origial Norway requirement, and now the small-diameter bomb, and a variety of software features that are in a morally flexible "plan" for Block 2 and Block 3.
The end of Block 3 SDD will be lucky to show an F-35 that can use a few select weapons in a beneign flight envelop.
Another weapon that disappeared from SDD (and Block 3) was internal carry of the air-to-air missile known as the AIM-132 ASRAAM. This was a U.K. requirement. Now, because of over-promise early in the program backed up by poor risk-assessment, that too is gone. Engineers are unable to provide this capability. Currently, AIM-132 will only see clearance on the outer wing hardpoints.
So, not only are the cost, development problems, and delay magnifiying with the troubled F-35 program, but the end of SDD (which is supposed to signify a realitively complete ....and
operational...jet) shows that we are getting much less than the promise.
As more time goes on, continue to watch as less capability is delivered for what will be, an obsolete-to-the-threat and faulty aircraft.