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reverse is true when changing from F-44 (JP-5) fuel to
F-40 (JP-4) or commercial ASTM type B fuels.
d. Mixing of Fuels. When changing from one type
of authorized fuel to another, (ie: JP-4 to JP-5), it is not
necessary to drain the fuel system before adding new
fuel.
e. Gravity Refueling. For gravity refueling, open
fuel vent shutoff valve, remove filler cap, pull chain
(opening anti-syphoning device), and service cells with
fuel to the required level (table 2-7).
2-86 Change 4
f. Closed-Circuit Pressure Refueling. Using service
instructions printed on the inside panel of the refuel
panel access door (fig 2-45), perform pressure refueling
precheck. When closed-circuit pressure
refueling do not exceed 15 psi fuel flow. Remove adapter
cap, and using standard Army nozzle, service fuel cells
with fuel to the required level (table 2-7). Using the
standard Army nozzle, fuel flow at 15 psi is 56 gallons
per minute.
g. Single-Point Pressure Refueling. Using service
instructions printed on the inside panel of the refuel
panel access door (fig 2-45), perform pressure refueling
precheck. Remove adapter cap, and using an
Army supplied SPA nozzle, fill fuel cells with correct
fuel to the required level (table 2-7). When single-point
pressure refueling do not exceed 50 psi fuel flow. With
the SPA nozzle, fuel flow at 50 psi is at least 100 gallons
per minute.
l The pilot and CPG shall perform
their armament safety check prior
to entering the forward area refueling
point (FARP).
l Radio transmissions shall be limited
to EMERGENCIES ONLY until
refueling has been completed.
h. Rapid (Hot) Refueling (Single Engine). For
rapid turnaround the helicopter may be refueled with
the rotors turning and the No. 2 engine shut down. The
following procedures and steps shall be observed for
rapid refueling:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
TAIL WHEEL switch - LOCK.
PARK BRAKE - Set.
Weapons switches - Off.
PLT/GND ARM/SAFE switches - OFF.
PLT/GND ORIDE switch - OFF.
HARS switch - NORM.
NO. 2 PWR lever - IDLE for 2 minutes, then
OFF
ANTI-COL switch - OFF.
Refueling - Monitor.
REFUEL VALVE OPEN caution light -
Verify off when refueling is complete.
Fuel caps/grounding cables - Installed/removed.
TM 1-1520-238-10
Change 6 2-87
12. ANTI-COL switch -- As Desired.
CAUTION
Do not hover with only one engine.
NOTE
· Upon completion of hot refueling
ground taxi off refueling pad if terrain
permits and accomplish steps 13
through 17.
· If terrain does not permit a safe ground
taxi, perform the following on the refueling
pad.
13. Engine 1 -- Power lever to FLY.
14. Collective -- Apply until 60% torque (#1 engine)
is reached or aircraft is light on wheels.
15. CROSSFEED switch -- AFT TK. Maintain
power setting for 30 seconds.
16. CROSSFEED switch -- NORM. Maintain
power setting for 30 seconds.
17. Collective -- Reduce to minimum torque.
18. NO. 2 engine -- Start.
i. Rapid (Hot) Refueling (Dual Engine). For rapid
turnaround the helicopter may be refueled, using the
D--1 nozzle only, with the rotors turning and both engines
at IDLE. The following procedures and steps
shall be observed for rapid refueling:
1. Repeat steps h.1 thru h.6 and steps h.8 thru
h.17.
WARNING
When opening anti-syphoning device
on external tank flapper valve, extreme
care should be exercised when
releasing air pressure to preclude
venting of fuel overboard through
filler neck.
NOTE
· Use of JP--4 is prohibited during auxiliary
tank operation above 80 °F ambient.
· External fuel transfer is prohibited below
minimum safe single engine airspeed
· Internal fuel transfer is prohibited during
external fuel transfer.
j. Refueling of External Auxiliary Tanks. The external
auxiliary tanks are gravity-filled through filler
receptacles. Remove the gravity filler caps and service
the auxiliary tanks to the ”AH--64 Fill line” marked on
the flapper valve inlet to the tank.
k. Fuel Sump Drains. Two fuel sump drains (detail
K, fig 2-45), one for each tank, are located on the
underside of the fuselage. They are used to drain fuel
and check for fuel contamination. To actuate, press the
plunger. Hold until sufficient fuel has been drained.
The auxiliary fuel tanks also contain fuel drains. To actuate
the auxiliary fuel tank drain valve, insert a phillips
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