The venerable Boeing F-15C Eagle has long been hailed as the world’s greatest
air superiority fighter given its lopsided combat record of 104 kills to zero losses,
however, the aging jet is likely near the end of its operational life. Nonetheless,
it remains a potent fighter even as it likely heads toward retirement.
The U.S. Air Force is deferring planned upgrades to the Eagle—such as the addition
of new electronic warfare systems—until it decides if it wants to keep the increasingly
aged airframe. Indeed, as the Air Force has discovered, the F-15C will need an extensive
airframe overhaul and structural modifications to remain in service past the mid-2020s.
In all likelihood, given that the Congress has refused to allow the service to retire
the A-10 Warthog, the Air Force will have little choice but to divest itself of the
F-15C to free up funding for more pressing projects. The F-15E Strike
Eagle interdictor aircraft, though, will remain in service indefinitely.
However, for the time being, the F-15C makes up about half of the
Air Force’s air superiority fleet because the service received less
than half of the Lockheed Martin F-22A Raptors that it required.
Eventually, the Air Force hopes to develop a new Penetrating Counter Air
platform to supersede both the F-15C and the F-22 in the 2030s as Russia and China
increasingly field new fifth generation fighters such as the Sukhoi Su-57 PAK-FA.
The Su-57—especially once it receives its new second stage engines—will be a handful
for any fourth generation fighter given its combination of speed,
maneuverability, stealth and electronic warfare capability.
However, the U.S. Air Force does have a plan to
defeat enemy stealth aircraft and a counter is already in the works.
The answer lies in the long-wave infrared spectrum,
which the current generation of stealth aircraft are not designed to suppress.
Nor does any countermeasure currently exist to suppress detection at long
range by a long-wave infrared sensor that could be retrofitted to existing airframes.
It is likely that engineers could in the future devise measures to
hide from a long wave infrared sensor, but the airframe would likely have to
be designed from the outset to incorporate those technologies.
Lockheed Martin is currently developing the Legion pod,
which will afford the F-15C a long wave Infrared Search and Track (IRST) capability.
Lockheed Martin expects to produce more than 130 Legion pods, which are equipped
with the company's IRST21 infrared sensor and advanced data processing capabilities
to provide long-range detection and tracking of airborne threats in “radar-denied environments.”
Boeing, which serves as the U.S. Air Force's prime contractor,
is expected to award Lockheed Martin an engineering, manufacturing,
development and production contract for the Legion pod sometime this year.
"With a rapid delivery schedule and unmatched sensing capabilities, Legion Pod will immediately
enhance our warfighters' operations and address a passive attack capability gap," Paul Lemmo,
vice president of Fire Control/Special Operations Forces Contractor Logistics
Support Services at Lockheed Martin Missiles and Fire Control, said last year.
"Our proven partnerships with Boeing, including on
our U.S. Navy F/A-18E/F IRST21 and international F-15 IRST products,
will ensure successful execution of the F-15C Legion Pod program for the U.S. Air Force."
The U.S. Navy and industry officials have previously told The National Interest
that long-wave IRST–especially when combined with high-speed
data networking—could generate a weapons quality track against a stealth aircraft.
That track would only get more precise with multiple IRST-equipped aircraft
sharing data amongst themselves. “It’s the Navy’s
primary counter-stealth capability,” one industry official had said.
Equipped with the Legion pod, the F-15C would easily negate any stealth advantage
that the Su-57 offers. Once the Eagle has spotted the Su-57, it would also be able to
bring to bear its immensely powerful Raytheon AN/APG-63(v)3 active electronically scanned
array (AESA) radar with a focused scan—and likely acquire the Russian jet that way too.
Either way, the F-15C would be able to generate a weapons quality track on the
Su-57 and engage it with its long-range Raytheon AIM-120D AMRAAM missiles.
Close in at the merge, if the Su-57s survive the initial AMRAAM volley,
the surviving F-15Cs would be at somewhat of disadvantage against the extraordinarily
maneuverable Russian fighters. However, the F-15C community has a lot of practice
flying against the extremely maneuverable F-22s, and while they are disadvantaged,
Eagle pilots do win dogfights against the Raptor on some occasions.
Moreover, with the addition of the Joint Helmet Mounted Cueing System and the Raytheon
AIM-9X Sidewinder, the F-15C has excellent high off boresight capability—the ability
for the pilot to shoot in the direction his head is pointed—as does the Su-57,
which more often than not results in a mutual kill as numerous training exercises have shown.
At the end of the day, if it were not for the maintenance and sustainment costs coupled with
the need to pay from structural repairs, it would likely be worth it to keep the
F-15C in service. However, given the age of the airframe and the continually evolving threat,
it is more prudent for the Air Force to invest in next generation capabilities
such as the PCA—especially since Congress will not let the service rid itself of
the A-10. Something has to give and it looks like the F-15C’s time has come.