reading (as stated in flight plan). Observe nozzles for
Close input valve before detaching
proper operation and flow, and check for system leaks.
hose from sprayer.
(5) After about 30 seconds, close valve control
Detach hose from aircraft by releasing ball
(6) Check nozzles for drip, and again check
holding ring (fig. 82) with one hand and pulling hose
system for leaks.
away with other hand.
(7) Repeat in-flight spray system checkout of
Replace dust caps on coupler halves.
steps 3 through 6, above.
Place hose end on top of barrel or other place to protect
(8) Record any troubles noted for future action.
from dirt. Replace cap on fluid drum.
(9) Place pump brake lever (29) in BRAKE ON
position, or permit pump to run as stated in flight plan.
Do not attempt to load insecticide
On successful completion of the in-flight
checkout, the spray system is ready for
securing sprayer in helicopter.
(11) A second method of filling the tank is
d. In-flight Operation.
through the top filler cap on tank (2, fig. 1-2). A hand
operation as stated in flight plan. Observe safety
pump or bucket and funnel may be used. In either case,
precautions listed on inside front cover of this manual.
use care not to damage the filler neck or strainer, or
Use the following steps and figure 12 as a guide:
contaminate the helicopter.
(1) Prior to reaching spray area, place
c. In-flight Checkout. Prior to carrying out
pump brake lever (29) in BRAKE OFF position.
actual spraying operations, conduct an in-flight checkout
(2) At the desired point, move valve
of the sprayer system. Perform checkout as follows (fig.
control lever (27) to VALVE OPEN position.
(3) Conduct spray operation as stated in
In-flate checkout of the spray system
(4) At the end swath (pass), move valve
must be carried out in an area set
control lever to VALVE CLOSED position to stop spray
aside for this purpose to prevent
(5) On completion of spray operation,
personnel, animals, or vegetation.
place brake control lever in BRAKE ON position to
Never exceed an air speed of 120
prevent overheating of pump.
knots with the spray system installed
e. Post Flight Operation. At end of spray
in the aircraft.
mission, the following post flight operations must be
If spray booms vibrate or misalign
during flight, reduce speed slowly,
land, and adjust tension of cables (ref
Be sure you drain any fluid still in
para 43, steps a(7)(h) through a(7)(l)).
tank into a drum that contains the
If a leak develops in flight within the
same type fluid being used. Do not
sprayer system, apply pump brake at
mix oil-base fluids with water-base
once and stop spraying.
If fan blade is damaged in flight and
(1) Tank holds some spray fluid at end of
causes vibration, apply pump brake at
flight and must be drained. Use one length of hose from
once and stop spraying.
liquid loading system to connect to valved nipple (34, fig.
of insecticide sprayer. Drain fluid from tank back into
Do not allow pump to run without
fluid in actual operation.
(2) Using the liquid loading system so that
(1) Subject to flight plan, pump brake lever
it may be cleaned out also, fill the spray tank with water,
(29) may be released (BRAKE OFF position) soon after
or non-corrosive mineral oil. Use water if spray fluid was
takeoff. This will permit stirring or heating of fluid.
water-base; use mineral oil if spray fluid was oil-base.
(2) When planned altitude and speed have
(3) Fly helicopter to an area set aside for
been reached and aircraft has arrived at test or
dumping, and permit system to unload. Empty tank by
operational area, proceed with in-flight checkout.
spraying in a manner like that described for normal
(3) If pump brake has not yet been
released, release at this point. Place valve control lever
(27) to VALVE OPEN position and observe nozzles for
(4) Observe pressure gage (28) for proper