reel operation on the model D-704 air refueling
d. Reception coupling for binding of
store. The inspection is accomplished as follows:
e. Direct a rearward stream of air (shop
air at 90 psi) across the generator blades and check
the lighting circuit for proper operation.
f. Shroud and shoe assembly for damage.
g. T5 switch arm for damage.
Be sure that the hose jettison cartridge is
removed before performing any main-
tenance on the store.
1. Remove the filler cap and side access doors
Ensure that the hose reel snubber valve is
and inspect the interior for corrosion, con-
installed prior to performing step 4.
taminants, and security of components. Reinstall
cap and doors.
4. Operate the reel for three cycles of
2. Inspect the ram air turbine for the
extension and retraction in accordance with the
MIM and check for the following:
a. Axial blade freedom. No looseness is
a. Presence of hose tension (response) at
fully extended position.
b. Angular blade freedom. A maximum of
b. Proper operation of tail cone lights and
10 degrees is permitted.
c. Lockpin engagement in reel for stowed
5. Perform the fuel flow test as follows:
a. Fuel the store to 50 gallons minimum.
Be sure that your hands remain away from
b. Extend the hose at least 25 feet in
the turbine blades' plane of rotation when
accordance with the MIM.
performing step c.
c. Remove the reception coupling and
insert the hose end in the filler cap opening.
c. With the power OFF, rotate the turbine
counterclockwise (viewed from front) until blades
are fully feathered. Hold the spinner stationary
and turn the power ON. The blades should snap
to the unfeathered position.
Be sure that the hose is held firmly in the
d. With the power ON, grasp any two
tank filler opening when performing step d.
opposite blades and twist toward the feathered
and unfeathered position. Check for binding of
d. Place the control panel TRANS-OFF
internal mechanism. Turn the power OFF.
switch in TRANS and check fuel flow. Minimum
e. With the power OFF, attach a 1-inch
flow as observed on the store control panel should
C-clamp on the end of the blade 12 inches from
be 40 gallons in 15 seconds (160 GPM) if JP-5
the center of the spinner. Rotate the turbine
fuel is used and 37.5 gallons in 15 seconds (150
counterclockwise (viewed from front) until the
GPM) if MIL-L-6081C (1010) oil is used.
blades are fully feathered. Then rotate the turbine
for at least two more revolutions. To measure
Fuel Part Removal/Installation
brake slippage, place the hook end of a fishscale
(0-15 pounds) at the C-clamp opening and
continue to rotate the turbine. The force should
The most important item for you to remember
be 3 to 5 1/2 pounds.
when removing or installing any engine part is to
follow the procedures set forth in the applicable
3. Extend the hose fully in accordance with
MIMs. The following basics should prove helpful.
the applicable maintenance instruction manual
(MIM) and inspect as follows:
1. Make sure all special and required tools are
a. Hose and fittings for slippage.
b. Hose for cuts, abrasion, and soft spots.
2. Have a new O-ring kit available for com-
c. Drogue assembly for torn canopy, bent
struts, and frayed cables.