JP-5 Flight Deck Fuel Systems Flashcards
In the main valve, the fueling valve and defueling valve each uses a well-supported and
reinforced diaphragm as its operating means. Normally each valve is in what position?
The fueling valve is spring- loaded closed and the defueling valve is held open by its
own weight.
What acts as an emergency shutoff valve, maintains a constant discharge pressure, and relieves discharge pressure rising above a predetermined setting?
CLA-VAL
Which valve in the CLA-VAL unit controls the delivery pressure when the main valve is in the
fueling mode?
Pressure reducing control valve.
Spring action holds what valves open?
Pressure reducing control valve.
Which valve shifts the CLA-VAL unit from the defuel to the fuel mode of operation, and from
the fuel to the defuel mode of operation?
SOPV
When there is an increase in the downstream pressure that is high enough to overcome the
force of the spring in the defueling pressure relief control valve, which of the following valves
will open?
The pressure reducing control valve and both pressure relief control valves.
When adjusting the delivery pressure on the CLA-VAL station, what pressure should you
adjust the pressure reducing control valve to first?
10 psi higher than the desired delivery pressure
The quick-disconnect has female threads on one end to accept the hose coupling. What
device(s) is/are used to connect the other end to the male end of the nozzle adapter?
A female ball bearing quick release.
What part of the pressure-refueling nozzle houses the operating linkage?
Body
Which pressure-fueling nozzle is constructed with the HEPCV (Hose-end Pressure Control
Valve) as an integral component of the unit?
D-1R nozzle
In a swing joint, what device connects the continuity wire to the spider assembly?
An amphonel stud
What device prevents the hose reel from moving when it is NOT in use?
A manual brake
What is the standard length for a completely assembled 2 1/2-inch collapsible hose?
50 ft
After cutting back and pressure testing a fuel hose, which of the following actions must you
take before fueling aircraft with that hose?
Flush, sample the hose and test the fuel.
What will happen to the solenoid on the CLA-VAL® if continuity is broken in any place?
It will immediately de-energize.
If a hose ruptures while you are fueling and the continuity circuit is not broken, what will
happen?
Fuel will continue to pump through the hose and out the rupture.
Velcon Aquacon filter cartridges used in a Plane-to-Plane Fuel Transfer Cart are designed to remove what (a) amount of water and (b) what percentage of particulate matter?
(a) 10 ppm and (b) 98%
What person has the final approval for authorizing a Plane-to-Plane Fuel Transfer request?
ACHO
Portable defuel pumps are powered by what force?
The ship’s low-pressure air.
The refueling crewman requests the fuel load from an aircraft. The pilot responds with four
fingers held vertically followed by three fingers held horizontally. How much fuel is in the
aircraft?
4,800 pounds
What request is designated by the hand signal “patting the top of the head/cranial”?
Top Off
What is the minimum number of personnel required to fuel an aircraft?
Four
If you are fueling an aircraft in the hangar bay and there is no roving fire-fighting equipment
manned, you must have a portable fire extinguisher nearby. What equipment used on the flight
deck normally satisfies this requirement?
The flight deck P-25.
What is the maximum time a fuel hose can be used without sampling and testing, while still
being used to fuel aircraft?
24 hours
What type of aircraft is the exception to hot refueling (engines “ON”) with canopy
opened?
AV-8B
When hot refueling helicopters, which of the following statements is not correct?
Side doors/windows (if installed) will remain closed during the entire refueling evolution.
The flow control handle of the pressure-refueling nozzle must be placed in the “fully open” or
“fully closed” position. Why is the handle not allowed to “float” during refueling?
To prevent excessive wear on the aircraft adapter and the nozzle poppet.
Who is responsible for ensuring the aircraft is fueled to the correct fuel load?
Plane captain
To defuel an aircraft, a written request must be submitted to and approved by whom?
Aircraft Handling Officer
Prior to defueling an aircraft, a sample must be drawn and tested for which of the following?
Flash point, free water, sediment.
Whose job is it to request the fuel loads on incoming aircraft?
Refueling Crewman
The main valve is actually two single-seated globe valves built into a common body. What
separate and distinct functions are performed by each valve?
Fueling and defueling
The CLA-VAL functions as a pressure-reducing valve to maintain a constant discharge
pressure not to exceed what psi?
55
The change from the fuel to defuel mode is accomplished by what?
Energizing, de-energizing the solenoid-operated pilot valve (SOPV), or by excessive
delivery pressure.
What is the effective range of spring tension that the pressure relief control valves can be
adjusted to?
20-70 psi
What is the size of the mesh monel screen covering the orifice plug in the ejector strainer?
60
What is the required housing criterion for the SOPV, in order for it to be used in hazardous
locations?
Explosion proof case
Where is the flow control valve (needle valve) situated on the CLA-VAL unit?
Between the ejector-strainer and fuel valve cover chamber
What valve of the CLA-VAL controls the speed at which a fuel hose charges when refueling
aircraft?
Flow control valve
The manual operation of the SOPV is done by pushing upward on the knob at the lower end of
the control and turning it how far and in what direction to lock it?
¼ turn in a clockwise direction
How is the nozzle strainer to a D-1 (SPR) nozzle held in place in the nozzle adapter?
By snap ring that fits into the recessed groove of the adapter
What is used to provide a means of attaching the fuel nozzle to the hose?
Quick disconnect coupling
What is provided on the nozzle body to allow for obtaining fuel samples?
Sampling port
What is used to insulate the swing joint amphonel stud that also prevents it from completely
grounding out?
Brass
What component of the fuel/defuel valve places it in the defuel mode if continuity is
interrupted?
SOPV
What is the preferred type of JP-5 defueling hose afloat?
2.5 inch diameter non-collapsible
What has to be done to new hoses prior to placing them in service?
Hydrostatic test, flush and sample them
When performing cut back maintenance to a fuel hose, how long should the continuity wire be
to compensate for hose stretch?
10 - 12 inches longer
What is the rated capacity of the defuel pump and at what psi?
100 gpm at 15 psi
What kinds of portable pumps are used on most defuel carts and plane-to-plane fuel transfer
carts, and what type of system is used to power these pumps?
Wilden Mk VIII diaphragm air-operated pump
Whose responsibility is it to make fueling assignments using information from the ACHO and
the CAG Maintenance Chief?
V-4 Flight Deck Control Talker
If an aircraft fails pre-check, when can it be cold refueled (engines off)?
Only if procedures are called out in that specific aircraft’s NATOPS
Which three individual signatures must be on the Aircraft Defueling Certificate prior to any
aircraft defueling operation?
Squadron maintenance rep, Aircraft Handling Officer, V-4 Maintenance Officer
When, if ever, can an aircraft be “hot refueled” with the canopy open?
Only if they are aircraft specifically noted IAW Aircraft Refueling NATOPS
What is the minimum allowable temperature required on all fuel samples obtained from an
aircraft suspected of low flash point, prior to lowering that aircraft to the hangar bay?
120 °F
An “X” placed on both sides of the aircraft’s nose with ordnance tape signifies aircraft that are
suspected to contain what?
Low flash point fuel
