Volume 3 Flashcards
Volume 3 UREs
What series of the H-60 is designed to give a smooth airflow induction for cooling major aircraft systems and subsystem component?
Main rotor pylon.
The H-60 stabilator vibration absorber is attached to the
right stabilator attachment fitting.
The roll vibration absorbers on the H-60 are installed under the
main landing gear drag beam support fairings.
Following installation, the H-60 vibration absorber that requires a tuning weight adjustment using the 8500 Balancer/Analyzer and functional check flight is the
cabin.
The attachment point for the tail wheel assembly on the H-60 tail landing gear is the
fork assembly.
What allows for thermal expansion when the brakes on the H-60 are OFF?
Master cylinder.
Before servicing an H-60 landing gear strut with nitrogen, you must ensure there
are no hydraulic fluid leaks.
To avoid placing undue stress on the brake assembly when servicing the upper stage of the shock strut, you need to
release the parking brake.
Before you apply external electrical power to perform an operation check of an H-60’s brake system you much first check the clearance around the
stabilator.
To operationally check the H-60 hydraulic system during ground operations, you use the
backup hydraulic system.
When the No. 1 hydraulic system on an H-60 fails, the pressure switch that will send a signal to the logic module is located in the
transfer module.
The utility module on the H-60 connects hydraulic pressure to the
second stage of the tail rotor (TR) servo.
The H-60 thermal relief valve protects the pilot-assist servo module from thermal expansion of the hydraulic fluid
during storage.
When pressed, the H-60 servo jam simulation button causes the
No. 1 or No. 2 PRI SERVO PRESS caution capsule to illuminate.
What type of hydraulic leakage is defined as “Fluid leakage is such that hydraulic reservoir levels may be dangerously lowered or depleted during normal operation, or a fire hazard may be created, or the air worthiness of the helicopter may be otherwise affected”?
Excessive.
The capacity of the cargo hook on the H-60 is
8,000 pounds.
The explosive cartridge (squib) on the H-60 cargo hook is used to
release the load during an emergency.
When the explosive squib is fired, the H-60 CARGO HOOK OPEN light will extinguish when
a new squib is installed.
The release mode that is not applicable to the H-60 cargo hook is
standard.
The hydraulic fluid for the H-60 rescue hoist is cooled by
a continuously running heat exchanger fan.
To avoid injury and prevent cable fouling when raising and lowering the rescue hoist cable on an H-60, you should use
leather gloves and maintain tension on the cable.
What is the most likely cause of a birdcaged rescue hoist cable on an H-60?
Hook bearing not rotating freely.
On the H-60, the valve type used to mix engine or auxiliary power unit bleed-air with the ambient air to obtain the desired temperature is
bleed-air mixing.
H-60 fire detector sensors react to
blue and red light.
The windshield anti-ice system heating elements on the H-60 will heat the windshield surface to a temperature of
70 - 115 degrees F.
When you place an H-60’s WINSHIELD ANIT-ICE COPILOT switch to the ON position, you should feel heat on the copilot’s windshield in approximately
five minutes.
The type of self-sealing valves installed in the H-60 fuel lines to contain the fuel in case of a helicopter crash or malfunction is
breakaway.
The H-60 fuel system pump that primes all fuel lines (if prime is lost) and acts as an auxiliary power unit (APU) boost for APU starts and operation is
prime boost.
The submerged fuel boost system on the H-60 operates in conjunction with the
engine-driven boost pump.
When the H-60 fuel boost pump is OFF, loss of engine fuel line prime is prevented by a
check valve on the submerged fuel boost pump.
Flow of fuel in the H-60 fuel system is directed by the fuel
management package.
The amount of useable fuel the H-60 internal auxiliary fuel tank will hold if it is single point refueled is
170 gallons.
On the H-60, fuel will automatically transfer when
one main fuel tank is at 887 pounds and the other is at less than 1,000 pounds.
The centrifugal-type fuel transfer pumps on the H-60 helicopter are powered by
28 volts direct current (VDC).
When the H-60 refuel probe is extended, the fuel from the retract side of the probe flows to the
No. 2 main fuel tank.
The amount of fuel that should remain in the main tanks of an H-60 after the fuel dump pumps shut off is
172 pounds.
The item used as a dielectric in the H-60 fuel quantify indicating system is
fuel.
If, on an H-60 fuel system, you want to remove 28 volts direct current (VDC) power, de-energize the fuel warning conditioner relays, and cause the No. 1 and No. 2 FUEL LOW capsules to illuminate, you would press teh FUEL
IND TEST push-button on the miscellaneous switch panel.
In comparison to other aircraft systems, troubleshooting the fuel system is more difficult because
the mechanical components are hard to access.
The generator kilovolt amperage rating of the auxiliary power unit on the H-60 is
20/30.
The type of protection that functions only during ground operation of the No. 1 and No. 2 generator control units on the H-60 is
underfrequency.
On the H-60, 115-VAC, B-phase power is connected to the alternating current (AC) essential bus by the
XFR relay.
The No. 1 and No. 2 direct current (DC) power converters on the H-60 helicopter receive power from
the alternating current (AC) primary buses.
To monitor the voltage capacity of the battery and generator, the H-60 flight engineer console is equipped with a
battery-generator meter.
The H-60 direct current (DC) essential bus is connected to the battery bus by the
No. 2 DC essential bus relay.
To perform continuity and voltage checks on H-60 electical systems, you would use
a multimeter.
What electrical check would you use to determine the amount of resistance (ohms) in a particular wire or component on an H-60?
Continuity.
What electrical check would you use to check for a specified amount of alternating current (AC) or direct current (DC) voltage in a particular wire or component on an H-60?
Voltage.
Before performing an H-60 electrical continuity check, you must remove all power from the circuit you are checking. Failure to do this could result in damage to the
multimeter.
What power source backs up the No. 1 and No. 2 generators on the H-60?
Auxiliary power unit (APU) generator.
The pin filter adapters in the H-60 alternating current (AC) electrical system are designed to filter
electromagnetic pulses.
The back panel of the H-60 central display unit (CDU) is equipped with
eight fuses.
The H-60 instrument that is part of the global positioning system (GPS) is the
horizontal situation indicator (HSI).
You externally zero the pointer on the H-60 vertical speed indicator by adjusting the screw in the
lower left corner of the indicator.
The indicator range of the barometric altimeters on the H-60 is between
1,000 to 50,000 ft.
To check the H-60 central display unit (CDU) dimming feature, you would use
a flashlight.
A main rotor (MR) blade on an H-60 is allowed to move about its axis for pitch changes by the
elastomeric bearing.
When an H-60 damper and reservoir are fully serviced, the indicator will show full
gold.
When the H-60 main rotor (MR) is rotating, centrifugal force will throw the droop stops out and permit increased vertical movement of the blades when the rotation percentage MR speed (Nr) is
70 to 75 percent.
The tail rotor (TR) on the H-60 is canted upward
20 degrees.
The H-60 pilot is alerted to a de-ice system malfunction by a
FAIL flag on the ice-rate meter.
Vibration is best defined as the periodic back and forth movement of a component caused by
unbalance or external forces.
Vibration frequency is the number of cycles completed in
a specified period of time.
What readings do you use to find the location and amount of imbalance on an H-60?
Amplitude and phase angle measurements.
The most probable cause of a low-frequency vibration is
a damaged or out-of-balance main rotor (MR).
What type of vibration frequency would an out-of-balance H-60 tail rotor drive shaft cause?
Medium.
High-frequency vibrations on the H-60 helicopter normally come from
a damaged main module.
Longitudinal movement of the H-60 helicopter is acomplished by movement of the
cyclic control.
The H-60 cyclic stick feature that allows the pilot to slew the stabilator trailing edge up without letting go of the stick is a(n)
manual slew-up switch.
The H-60 flight control feature that will counteract the pitching movement resulting from the vertical lift of the canted tail rotor (TR) is the
yaw to longitudinal mixing.
On the H-60, the yaw stability augmentation system (SAS) command comes from an alternating current (AC)-powered
yaw rate gyro.
The statement that best describes flight control component proof torqueing is
after torqueing…, reduce the torque to half….
On an H-60, what screw threaded component’s procedures are identified by SC?
Safety Critical.
During an H-60 main rotor rig check, the item you use to inspect all safety critical parts is
a 10-power magnifying glass.
You are performing a tail rotor (TR) rig on an H-60. You are ready to make adjustments to a TR cable tension. You make these adjustments at the turnbuckles located
in front of the tail cone.
You are performing a tail rotor (TR) rig on an H-60. TO do this properly you must have a bias of
3 degrees.
You are troubleshooting the directional control pedals on an H-60 and the problem still persists. Your next course of action will be to
perform a tail rotor rig check.
The T700 engine module that extracts most of the energy from the exhaust gases for output power is the
power turbine.
Which sumps are used for the emergency oil system on the T700 engine?
A and B only.
The internal bypass flow in the T700 fuel boost pump provides approximately
twice the maximum fuel-flow.
The type of fuel pressure the T700 engine electrical filter bypass sensor senses is
differential.
The T700 engine component that stops fuel-flow after sensing an overspeed condition is the
digital electrical control (DEC).
The thermocouple harness on the T700 engine is a
one-piece assembly with seven non-removable probes.
The hydromechanical unit actuating system on the T700 engine will open the start bleed valve when gas generator speed (Ng) goes below
87 percent.
The scroll vanes of the T700 engine are anti-iced by
hot scavenge oil.
The H-60 auxiliary power unit (APU) component protected by a 10-micron inlet filter is the
fuel pump.
If you have a problem during H-60 auxiliary power unit (APU) start or operation, what color will the electronic sequence unit’s (ESU) built-in test equipment (BITE) indicators change to illustrate the problem?
Black to white.
If you find it is difficult to pull the input module free from the main module when removing the input module from an H-60 power train, you can help break the input module loose using
bolts.
On the H-60, filtered oil is provided to all main transmission bearings and gears by the
integral sump lubrication system.
If the main transmission on an H-60 suffers a total oil loss, it can operate at cruise for
30 minutes.
The main transmission on the H-60 is equipped with
two lubrication pumps operating in parallel.
The pressure side of the H-60 main transmission lubrication pumps supplies oil in gallons per minute (gpm) and pounds per square in (psi) at a rate of
15 gpm at 50 - 55 psi.
On the H-60, the oil between the main module and the passages to the input modules, accessory modules, and generators is divided by the
main module manifold.
The section of the tail drive shaft on an H-60 that contains interchangeable shafts is
II.
The H-60 tail gearbox changes the angle of drive by
105 degrees.
What is indicated if the red fire extinguisher thermal discharge indicator is missing?
One or both fire bottles have discharged.
What is the operational pressure range, in pounds per square in (psi), of the tail wheel tire?
115-125.
If elastomer extrusion is identified on an elastomeric bearing, the bearing should be replaced
within the next 50 flight hours.
What TO should you consult for loading and offloading you helicopter on a transport aircraft?
The -9 TO of the aircraft you are using for transport.
What aircraft can the H-60 be air shipped on?
C-17, C-5.
