moisture absorption of rope or thermal contraction of
cable or chain. Do not use slip knots. Use bowline
knots to secure aircraft to mooring stakes.
Chock the wheels.
Structural damage can occur from high velocity winds;
therefore, if at all possible, the aircraft should be moved
to a safe weather area when winds above 75 knots are
expected. Moored aircraft condition is shown in figure
2-36. If aircraft must be secured, use the following
After aircraft is properly located, place
nose wheel in centered position. Point the aircraft into
the wind, or as nearly so as is possible within limits
determined by locations of fixed mooring rings. When
necessary, a 45 degree variation of direction is
considered to be satisfactory. Locate each aircraft at
slightly more than one wing span distance from all other
aircraft. Position nose mooring point approximately 3 to
5 feet downwind from ground mooring anchors.
Deflate nose wheel shock strut to within
3/4 inch of its fully deflated position.
Fill all fuel tanks to capacity, if time
Place wheel chocks fore and aft of main
gear wheels and nose wheel. Tie each pair of chocks
together with rope or join together with wooden cleats
nailed to chocks on either side of wheels. Tie ice grip
chocks together with rope. Use sandbags in lieu of
chocks when aircraft is moored on steel mats. Set
parking brake as applicable.
Tie aircraft down by utilizing mooring
points shown in figure 2-36. Make tiedown with 1/4 inch
aircraft cable using two wire rope clips, or bolts and a
chain tested for a 3000 pound pull. Attach tiedowns so
as to remove all slack. Use a 3/4-inch or larger manila
rope if cable or chain tiedown is not available. If rope is
used for tiedown, use anti-slip knots (such as bowline
knot) rather than slip knots. In the event tiedown rings
are not available on hard surfaced areas, move aircraft
to an area where portable tiedowns can be used. Locate
anchor rods at point shown in figure 2-36. When anchor
kits are not available, use metal stakes or deadman type
anchors, providing they can successfully sustain a
minimum pull of 3000 pounds.
considered to be of doubtful security due to existing soil
condition, drive additional anchor rods at nose tiedown
position. Place padded work stand or other suitable
support under the aft fuselage tiedown position and
Place control surfaces in locked position
and trim tab controls in neutral position. Place wing
flaps in up position.
The requirements for dust excluders,
protective covers, and taping of openings will be left to
the discretion of the responsible maintenance officer or
the pilot of the transient aircraft (fig. 2-34).
Secure propellers to prevent windmilling
conditions, mooring, security can be further increased
by placing sandbags along the wings to break up the
aerodynamic flow of air over the wing, thereby reducing
the lift being applied against the mooring by the wind.
The storm appears to pass two times, each time with a
different wind direction. This will necessitate turning the
aircraft after the first passing.
After high winds, inspect aircraft for
visible signs of structural damage and for evidence of
damage from flying objects. Service nose shock strut
and reconnect battery.