HEADQUARTERS OH-58A, Technical Manual, Page: 110 / 292

TM 55-1520-228-10
2-62
(2) Servicing unit shall be grounded (servicing
unit to ground and servicing unit to helicopter). The heli-
copter should be grounded to the same ground point as
is the servicing unit.
(3) After completion of servicing, remove
nozzle, reinstall cap, and disconnect all grounds from
helicopter.
b. Servicing.
(1) Fill tank cells with specified fuel. Refer to
table 2-1.
(2) Refer to table 2-1 for fuel tank capacity.
c. Before Rapid (Hot) Refueling:
WARNING
Only emergency radio transmission
should be made during rapid
refueling. In case of aircraft fire,
observe fire emergency procedures
in Chapter 9. Do not attempt to fly the
aircraft.
(1) Minimum crew will remain at the controls.
(2) Throttle - Idle.
(3) Force Trim - ON or controls frictioned.
(4) Passengers shall depart the aircraft and re-
main clear of the helicopter.
(5) No smoking allowed during refueling opera-
tions.
(6) A crew member, if available, should observe
the refueling operation (performed by authorized refuel-
ing personnel) and stand fire guard as required.
d. During Rapid (Hot) Refueling.
(1) Closed Circuit Refueling.
(a) Ground the helicopter at the receptacle
located adjacent to the filler cap on the helicopter to the
filler-nozzle and remove filler cap.
(b) Ensure that gravity refueling port is
closed. If not, rotate inner sleeve counterclockwise until
gravity refueling port is closed and flange of sleeve is in
contact with rivet at base of receiver cylinder. Refer to
figure 2-23.
CAUTION
Ensure that servicing unit pressure
is not above 125 PSI while refueling.
(c) Insert fueling nozzle into receiver and
actuate automatic nozzle lever to ON or FLOW position.
Pin at base of nozzle will momentarily indicate when fuel
flow stops.
(d) Fuel flow will automatically shut off
when normal fuel level is reached. Just prior to normal
shut off, fuel flow may cycle several times as fuel level
is reached. Gage on servicing unit will indicate when
flow is stopped.
(e) When fuel flow has stopped, actuate
lever on nozzle to OFF, disconnect nozzle from receiver
and replace filler cap.
(f) Disconnect fuel nozzle ground and re-
wind hose assembly.
(g) Disconnect servicing unit ground at he-
licopter.
(h) Disconnect servicing unit ground at
grounding stake.
CAUTION
If helicopter is equipped with closed
circuit refueling system and fuel
servicing unit is not equipped with
related nozzle for closed circuit
refueling, a gravity system may be
used providing the servicing nozzle
does not exceed 1.75 inches outside
diameter. To refuel utilizing the
gravity nozzle, it is necessary to
positon the inner sleeve of receiver
until slot is lined up with fuel port in
bottom of receiver. Position nozzle
into port in order by bypass closed
circuit valve. Damage could result to
the closed circuit refueling system if
caution is not used to prevent
damage to inner sleeve of receiver at
fuel port through improper use of
nozzle.