Advise Fly-Three talker at the deckedge
control station that ENGINES ARE SET or
ENGINES NOT SET.
Weight selector push-button controls on
the Pri-Fly panel are for emergency resets
DECKEDGE CONTROL STATION
The Mk 7 recovery equipment controls are
grouped in two areasthe engine room and the
The deckedge control station is located on the
starboard side aft, where the operator has a clear,
unobstructed view of the landing area.
The deckedge control station is equipped with
control levers to retract each of the pendant engines
and the barricade; a pressure gauge for the
barricade hydraulic system; a control lever to raise
or lower the barricade stanchions; push buttons to
raise, lower, or stop the retractable sheaves; an
indicator light to indicate their position; a battery
position indicator light for the damper sheaves; and
synchro receivers to monitor settings on the aircraft
weight selector unit of each engine.
The deckedge control operator operates the
controls from the gallery walkway and is equipped
with sound-powered phones to maintain voice
communications with the engine-room operator and
The retracting valve permits the controlled
return of fluid from the accumulator to the cylinder,
thereby returning the engine to the BATTERY
position. The general location of the retracting
valve is shown in figure 3-6.
The retracting valve is a self-contained
poppet-valve assembly composed principally of a
housing, a plunger, an operating lever, a valve stem,
and a valve seat.
The retracting valve operates as a check valve
against the flow of fluid from the accumulator to the
Fluid at accumulator pressure
enters the housing and bears on the stem in the
direction that would open the valve; however, the
pressure also bears against the base of the plunger,
which tends to close the valve. Since the area of the
plunger end is greater than that of the stem, the
differential in force keeps the valve closed.
The retracting valve has piping that provides
passage for engine fluid flow from the arresting
engine, by way of the retracting valve, to the cable
A discharge port is provided
where the retracting valve and pressure valve body
are bolted together to allow fluid flow from the
accumulator or fluid cooler into the main engine
cylinder during retraction.
RETRACTING VALVE BODY.The retracting
valve body is a hollow steel casting with an inlet
port, connected by piping to
accumulator/fluid cooler manifold, a discharge port
that is flanged and bolted to the engine cylinder
outlet elbow, and a port connected by piping to the
cable anchor dampers.
The valve body is bored and machined smooth
inside to receive the valve seat.
provided as a seal between the valve body and the
seat. The lower portion of the valve body has an
inside machined recess for insertion of a V-ring
The V-ring packing prevents
leakage between the stem and valve body.
VALVE SEAT.The valve seat is a hollow,
machined, cylindrical piece of bronze. One end is
flanged and is bolted to the valve body, and the
opposite end is machined to form a mating surface
(seat) for the valve stem. Four vertical elongated
holes are machined in the seat to allow fluid to
enter the valve from the accumulator.
VALVE STEM.The valve stem is a round piece
of machined steel with a shoulder machined midway
between the top and bottom. This shoulder mates
with the valve seat and blocks fluid flow through the
retract valve during arrestment and from the
accumulator to the engine cylinder until retraction
PLUNGER.The plunger is a round piece of
machined steel that is blind bored at one end to
receive the shank of the valve stem. The plunger
and valve stem are connected by a dowel pin. The
opposite end of the plunger has a machined clevis
and is externally threaded just below the clevis. The