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isfieetopivot leftorright withina+26”swayanglewith
positive centering action provided by a pneumatic
damper housed inside the tailhook shank. The trail angle
of the arresting hook provides for hookpoint-deck
contact even with the nose landing gear strut fully
compressed.
2.29.1 Arresting Hook Operation. Normal operation
of the arresting hook requires combined and flight
hydraulic system pressure, dashpot charged, and dc essential
No. 2 electrical power. Because of a redundant
means ofpilot control (electrical and mechanical), emergency
extension of the arresting hook can be accomplished
without these sources of power.
Note
Hook retraction requires electrical and combined
hydraulic power.
2.29.1.1 Normal Operation. Normal operation
(Figure Z-75) on the pilot hook control consists of a
straight down-up movement of the HOOK handle. This
action actuates switches that provide electrical command
signals to the hook control valve. For lowering the
hook, the uplock is released and the lit? cylinder is
vented. Flight hydraulic pressure is the medium that
disengagest he hook uplock actuator.W hen flight hydraulic
pressure drops below 2,100 psi with weight off
wheels, the hook/auxiliary flap isolation relay circuit is
energized.T his disablest he arrestingh ook control valve
and, therefore, disallows normal hook extension. This
condition remains until either the starboard enginedriven
hydraulic pump (flight) produces greater than
2,400 psi or weight on wheels is restored.
Note
If emergency hook extension is inoperative
in conjunction with a flight hydraulic failure,
cycling the HYD VALVE CONT circuit
breaker (8E5) with the hook handle down
will permit hook extension.
2-129 ORIGINAL
NAVAIR Ol-Fl4AAD-1
STRUT EXTENDED TO
NORMAL STATIC POSITION
(18 INCH STRUT)
CATAPULT STATIC POSITION FULLY COMPRESSED
I4 INCH STRUT)
0.F6cm3
Figure 2-74. Laud BU (Cat@t)
ORIGINAL 2-130
NOMENCLATURE FUNCTION
0 Arresting HOOK handle UP- Electrically energizes hydraulic retract actuator to raise hook into
uplock.
DN- Electrically releases hydraulic uplock actuator and allows hook to
extend by dashpot pressure and gravity,
EMERG
DOWN - (Pull-twist) mechanically releases uplock actuator and allows
hook to extend by gravity and dashpot pressure.
0 Hook transltion light Illuminates whenever arresting hook posltlon does not correspond with
handle position. Light will not go out In down position until hook is In full trail
angle.
0 HOOK BYPASS switch FIELD - Used for nonarrested landings. Bypasses the flashing feature of
the approach lights and indexer when landlng gear Is down and
hook retracted.
CARRIER Used for arrested landings. Approach lights and indexer flash
when landing gear is down and the hook retracted.
Figure 2-75. Arresting Hook Conkok
2-131 ORIGINAL
NAVAIR 0%FlUAD-I
2.29.1.2 Hook Retraction. For hook retmction, the
control valve pressmixes the retract side Of the. lift cylindor
and the lock side of the actuator.
fYijG&J
DO not attempt to raise the hook when the
hook is engaged in the arresting gear.
When the arresting hook roller engages the uplock
mechanism, the lift cylinder is depressmixed.O n deck,
hook retraction time is approximately 3 seconds. The
hook transition light is illuminated as long as a discrepancy
exists between the hook and cockpit handle positions.
On-deck extension requires approximately 1
second. The transition light will remain illuminated, unless
the a&aft is kneeled, as contact with the deck
precludes full hook extension.
Note
The hook transition light may remain illuminated
when the hook handle is lowered at
airspeeds greater than 300 knots because of
hook blowback.
2.29.1.3 Emergency Hook Extension. The emergency
control system lowers the hook by mechanically
(cable) tripping the uplcck and venting the hook lit?
actuator pressure. Emergency extension of the hook
may be initiated when the handle is in either UP or DN.
In either case, the hook handle is pulled aft (approximately
4 inches) and turned 90” counterclockwise. Rotation
90” counterclockwise will lock the handle in the
extendedp osition. With the handle locked,t he hook will
not retractr egardlesso f the handle position (UP or DN).
Note
After emergencyh ook extensiont,h e hook can
be dracted airhome or on deck provided that
thebsndleismtated90°clockwise,pushedfcll
forward and placed in UP. Combined and
flight hydraulic system pmssmes mresuired
　
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