successfully completed arrested landings on the carrier USS Nimitz off
the California coast on Nov. 3, marking the start of the at-sea
developmental test phase for the Joint Strike Fighter and the shipborne
debut of the Navy’s first piloted stealth aircraft.
The first F-35C to land, CF-03 from Navy Air Test and Evaluation Squadron VX-23, touched down after flying out to the carrier from Marine Corps
Air Station Yuma, Ariz. Flown by Navy test pilot Cmdr. Tony ‘Brick’
Wilson, the aircraft first made a low approach and overshoot, followed
by a touch-and-go with the tailhook retracted. Finally, with an F/A-18F
acting as chase, Wilson brought the F-35C in for the first arrested
landing. A second aircraft, CF-05, arrived less than an hour later and
landed successfully at flown by Lt. Cmdr. Ted ‘Dutch’ Dyckman.
|F-35C on USS Nimitz|
aircraft made highly stable approaches, and trapped firmly on the third
of the Nimitz’s four arrestor wires. The touchdown spot between the
second and third wires is considered the optimum for carrier landings.
The landing was also key test for the F-35C’s arresting hook system,
which had to be redesigned with additional stiffness, a modified
hold-down damper and revised shaping after poor performance in tests
three years ago at Naval Air Warfare Center Lakehurst, N.J. Having
delayed the start of carrier trials, the performance of the redesigned
hook was a significant watch item. “It’s a little bit different of a
design, and obviously it works,” says U.S. Pacific Fleet, Naval Air
Forces Commander, Vice Admiral David Buss.
calm seas and light winds from the northwest contributed to the benign
conditions and resulting trouble-free landings, both pilots partly
attributed the precision touchdowns and stable approaches to the F-35C’s
integrated direct lift control feature. Embedded in the flight control
software for all three JSF variants, test pilot Wilson says direct lift
is particularly useful for the F-35C because it provides greatly
improved glide slope control.
conventional carrier aircraft in which the pilot approaches the carrier
with flaps set at a fixed position and adjusts power and pitch attitude
to stay on the glideslope, the F-35 system controls power through an
‘auto-thrust’ function and alters the position of the trailing edge flap
in response to the pilot’s inputs. “So the stick becomes my glideslope
controller,” notes Dyckman. “If I pull back the flap adds lift, if I
push forward it commands a steeper approach,” he says. As nominal flap
position for a carrier approach is 15 degrees, or half-flap, this
provides ample margin for additional flap movement to add or reduce
lift. Wilson says the effect is to “change the ‘heave’ of the aircraft,
rather than the pitch.”