Section I. SERVICE UPON RECEIPT OF MATERIEL
(1) Check strainer assembly (11), fluid
Inspecting and Servicing the
coupler and nipple (4 and 5), hoses (8), and ball valve (2)
for tightness and condition.
a. Insecticide Sprayer. Prior to each flight,
(2) Check fuel level of pump engine. Add
with the insecticide sprayer (fig. 1-2) installed in the
fuel if needed.
helicopter, perform the following preflight checks
specified by the Maintenance Allocation Chart (app. B):
Fuel and fuel vapors are explosive
(1) Check all hoses for condition and
mixtures. Do not use near open
Wash hands after using,
(3) Check tank assembly (1) for damage,
before smoking or eating.
leaks, and alignment.
(4) Check vent and overflow tube (3) for
condition and tightness.
Mix fuel in exact amounts. Use only
(5) Check tank straps (4 or 6, and 22),
clean, fresh gasoline, and clean
pump struts (20), and tiedown lugs (28, fig. 4-2) for
mixing cans. Mix oil and fuel well
before pouring into fuel tank to
insure constant oil content.
support struts (11), braces (16), struts (20), and cables
(12, 13, and 17) for wear, damage, proper tension, and
(a) Thoroughly mix fuel in a clean fuel can,
using the following table as a guide:
(7) Check all nozzles (14) to assure that
Fuel Mixing Table
tips are clean and are properly aligned.
(1:16 ratio of OE-30 motor oil to regular gasoline)
(8) Check attach fasteners for pump and
brake assembly (18), for tightness.
(9) Check blades of synchromatic windmill
(19) for proper angle setting, as called out in flight and
Do not fill gas tank when engine is
(10) Check handle of bypass valve (24) for
running, as to do so might cause a
proper position as called out in flight and spray
(b) Fill tank to within 1/, inch of top of filler neck.
Use a filler spout or funnel to prevent spillage. Replace
gas cap and wipe up any spilled fuel before starting
Handle is closed in pull position, with
flow going back to pump.
(3) Inspect engine and pump for general
condition. Inspect ignition cable for security.
(11) Check control valve (25) for operation
(4) Check that ball valve (2), is in closed
by using valve control lever (27). If faulty, check for
position (handle across tube).
binding in fittings at end of connecting rod.
(12) Check that manual control panel (26) is
Before starting engine, be sure the
in proper position.
pump contains fluid (insecticide or
(13) Check fan brake in locked and
unlocked positions by using pump brake lever (29).
(5) Remove pump filler cap (3, fig. 112)
and fill pump body with fluid through opening. Replace
Fan should spin freely by hand when
cap and gasket.
(14) Listen to pump bearings when fan is
Always replace filler cap and gasket after priming pump.
hand spun to assure freedom from friction.
The pump cannot self-prime when dry. However, once
filled with fluid, the pump will retain fluid for automatic
using the liquid loading system to load fluid into the
priming and need not be refilled except if overturned or
insecticide sprayer, perform the following checks:
(6) Start the pump engine and run for about 30 seconds
to test for proper operation. Stop engine after this test.
b for engine starting and stopping.