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(HOOK handle down) and allowing snubber pressure and gravity to extend the hook. The hook should
extend in less than 2 seconds. At touchdown, the arresting hook snubber controls hook bounce and
provides a hold down force for arresting cable engagement.
Arresting hook retraction is accomplished by raising the HOOK handle. This electrically opens the
aft isolation valve and the arresting hook selector valve, routing HYD 2B pressure to the arresting hook
retract actuator. HYD 2B pressure overcomes the snubber down-load pressure and raises the hook. The
arresting hook uplatch mechanism captures and locks the hook in the up position. The hook should
retract in less than 4 seconds. If HYD 2B pressure is lost, the arresting hook cannot be retracted.
2.7.5.1 HOOK Handle. The HOOK handle, located on the lower right main instrument panel in the
front cockpit, is used to control arresting hook extension and retraction.
Up
(unmarked)
Retracts the arresting hook utilizing HYD 2B pressure.
A1-F18EA-NFM-000
I-2-54 ORIGINAL
Down
(unmarked)
Unlocks the arresting hook uplatch mechanism and allows arresting hook snubber
pressure and gravity to extend the hook.
2.7.5.2 HOOK Light. The red HOOK light is located on the lower right main instrument panel
directly above the HOOK handle. The HOOK light comes on any time hook position does not agree
with HOOK handle position. The light comes on when the hook leaves the up and locked position and
remains on until the hook is fully extended (hook proximity switch energized). With WonW, the hook
will strike the ground before it reaches full extension, so the HOOK light will remain on.
2.8 WING FOLD SYSTEM
The aircraft's outer wing panels are designed to fold vertically to reduce the amount of deck space
occupied by the aircraft in the carrier environment. Each wing contains an independent wingfold
mechanism, which consists of two electric motors (one to lock/unlock the wings and one to spread/fold
the wings). During normal operation, the wings are spread, locked, unlocked, and folded in unison.
2.8.1 Wingfold Mechanism. Each wingfold mechanism contains a dc electric motor, which locks and
unlocks the wings, and an ac electric drive unit, which spreads and folds the wings. When the wings are
spread and locked, a locking bolt is electrically driven through the wingfold hinge, holding it in place.
When the wings are unlocked, a wing unlock flag (commonly called a beer can) protrudes from the
upper surface of the wing near the leading edge of the wingfold hinge, indicating that the locking bolt
is unstowed. The shaft of each beer can is painted red for easy identification. When the wings are
locked, the top of the beer can should be flush or near flush with the upper surface of the wing, and no
red should be showing.
Additionally, when the wings are folded, the ailerons are mechanically locked in the faired position
by a hook on the inboard aileron hinge, which engages an aileron locking pin. The aileron locking pin
is mechanically extended as the wings fold. The hook and locking pin are designed to prevent the
ailerons from blowing inboard over the TEFs when hydraulic power is not applied. If an aileron locking
pin should break, it is possible for the aileron to blow inward over the TEF. If this condition exists
during engine start, the TEF will retract into the aileron, damaging both surfaces.
If the wings are folded, note the position of the ailerons during the
preflight walk-around. If the aileron locking pins do not restrain the
ailerons in the faired position, make sure the ailerons are moved to a
faired or outboard position prior to engine start to preclude damaging the
ailerons and TEFs.
Each wingfold mechanism also contains a wing safety switch, which electrically prevents wingfold
movement. The safety switch is activated by a ²remove before flight² pin inserted in the underside of
the wing near the wingfold hinge.
For ground crew operations (such as loading wingtip missiles), each wing can be manually unlocked,
folded, or spread. The beer cans can be manually extended by inserting a screwdriver into the wing
unlock motor (underside, leading edge). Once unlocked, the wings can be folded or spread by inserting
a speed handle into the electric drive unit (underside, trailing edge).
A1-F18EA-NFM-000
I-2-55 ORIGINAL
2.8.2 Wingfold Operation. With the wings folded, wing spread and lock is commanded by placing the
WINGFOLD switch to SPREAD. The SPREAD command is sent directly to the electric drive units to
spread the wings (there are no WonW or FCC interlocks). When each wing reaches the completely
spread position, power is removed to that electric drive unit, and that wing is automatically
　
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