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illuminate for a planing link failure, wheels warning, or loss of air data.
2.7.1.9 Landing Gear Position Lights. Three green landing gear position lights, located on the lower
left main instrument panel, are labeled NOSE, LEFT, and RIGHT. When the LDG GEAR handle is
DN, steady lights indicate that the corresponding landing gear is down and locked. The LEFT and
RIGHT landing gear position lights are also used to indicate a planing link failure. If the main landing
gear are down and locked but a planing link proximity switch is not properly activated, the
corresponding position light will flash.
A landing gear position of three down and locked is indicated by three steady green position lights
with the landing gear warning light out. Additionally, when illuminated inflight, the approach lights
provide an external indication that the landing gear is down and locked.
If a landing gear position light is out with the LDG GEAR handle DN and the landing gear warning
light out, a LT TEST should be performed to test the integrity of the position light bulb. If the bulb
tests bad, it is safe to assume that the gear is down and locked. During day operations, if all three
position lights appear to be out/dim, make sure the interior lights MODE switch is in the DAY position.
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A landing gear position of three up and locked is indicated by the landing gear warning light out with
all three position lights out.
If one or more landing gear indicates unsafe, a visual inspection can only
confirm general position and obvious damage. There is no external
indication of a locked landing gear.
2.7.1.9.1 Landing Gear Position Lights (F/A-18F). Three green landing gear position lights, labeled
NOSE, LEFT, and RIGHT, are located on the upper left main instrument panel in the rear cockpit.
These lights have the same functionality as those in the front cockpit.
2.7.2 NWS - Nosewheel Steering System. The aircraft's NWS system is used to provide directional
control and shimmy damping during ground operations. The NWS hydraulic power unit, attached to
the nose landing gear strut, is electrically controlled by commands from the FCCs and is hydraulically
actuated by pressure from HYD 2A or the APU accumulator. In the event of a HYD 2A failure, a
pressure-biased shuttle valve routes APU accumulator pressure to the NWS unit for emergency
operation. The FCCs accept input from the rudder pedals to provide NWS commands.
The NWS system has two modes, NWS (low) and NWS HI. In the low mode (NWS cue in the HUD),
full rudder pedal deflection commands approximately 22.5° of nosewheel deflection. In the high mode
(NWS HI cue in the HUD), full rudder pedal deflection commands approximately 75° of nosewheel
deflection. The NWS system (low gain) incorporates a yaw rate feedback input from the FCCs, which
is designed to suppress directional PIO tendencies by increasing directional damping during takeoff
and landing roll.
With loss of yaw rate information to the FCCs, directional PIO may occur
during aggressive ground tracking.
If the NWS system fails, the NWS and FCS cautions will be displayed and the NWS or NWS HI cue
will be removed from the HUD. When failed, the NWS system reverts to a 360° free-swiveling mode.
2.7.2.1 NWS Engagement/Disengagement. With WonW, manual NWS engagement is provided by
actuation of the NWS/undesignate button. The method required to engage each of the two NWS
modes (low and high) is dependent on wing lock/unlock status.
With the wings spread and locked and NWS disengaged, the first momentary press and release of the
NWS button engages full-time NWS (low). NWS HI is engaged by subsequent press and hold of the
NWS button. With NWS disengaged, press and hold for greater than 1 second will also engage NWS
HI. If the NWS button is released, the system reverts to NWS (low).
With the wings unlocked and NWS disengaged, the first momentary press and release of the NWS
button still engages full-time NWS (low). However, subsequent press and release engages full-time
NWS HI, providing hands-free NWS HI capability for operations in the carrier environment. If the
wings are subsequently spread and locked, NWS will revert to the low mode.
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I-2-46 ORIGINAL
During landing, full-time NWS (low) is automatically engaged when the nose landing gear and at
least one main landing gear transition to WonW. If NWS is engaged with a HYD 2A failure, the NWS
or NWS HI cue will flash in the HUD as an indication that APU accumulator pressure is depleting.
NWS is manually disengaged by pressing the paddle switch. NWS is automatically disengaged for
catapult launch, when the launch bar is extended. With the launch bar extended, NWS (low) can be
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NATOPS Flight Manual 飞行手册 1(52)
