HM 15 Wings Flashcards

Terms Definitions
Ice detector system
uses a radioactive probe (Strontium 90) that is installed in the heater inlet duct.
In-flight blade inspection system:
In flight blade inspection system uses a pressure indicator with radioactive source (Strontium 90) that is installed in root end of each main rotor blade.
Maximum gross weight
69,750 lbs
Maximum airspeed
150 KIAS.
. Maximum single point external cargo capacity
Maximum tow tension
25,000 lbs with surge up to 30, 000 lbs
emergency exits
Pilot’ and copilot jettisonable windows, Emergency escape hatches (three), Cargo door window, Personnel door, Emergency exit window, aft, one on each side
State the following aircraft capacity for transporting personnel.
a. Troop seats: 55 troops. 17 on the right, 20 on the left 18 in the middle.
b. Litter provisions: 24 pole type litters. The litters are arranged in six tiers of four litters each.
Cargo conveyer assembly.
consists of two reversible conveyers recessed into the cargo compartment floor and ramp. The conveyers are designed to support 2200-pound load on 48-inch pallet. The conveyers consist of a series of rollers to aid the loading of pallets or other general cargo.
the wind restrictions for spreading / folding the main rotor blades
Blades should not be folded or unfolded in winds over 45 knots form any direction. When possible in winds over 20 knots, the aircraft should be positioned into the wind.
the location of external mooring fittings (tie down points) on the aircraft.
4 One is aft and outboard of each sponson, one is on each side of the fuselage aft of the electronic compartment.
turn radius limitations of the nose wheel while towing
Make certain helicopter is moving before turning nosewheel and do not turn nosewheel more than 90 deg.
hydraulic patch test
Aircraft-Class 5
Support Equipment-Class 3
State the precautions that must be observed during aircraft jacking
Do not jack helicopter while engines or main rotor blade are in operations, ensure all circuit breakers are in desired position for maintenance to be done and FM antenna is at retract, disconnect tow bar from helicopter, do not remove ground safety lockpins from landing gear struts while raising or lowering helicopter, during high or gusty winds helicopter must be tied down, ensure all personnel are clear of helicopter when lowering jacks.
Discuss the purpose of the main rotor blade damper.
The hydraulic dampers minimise the hunting movement of the blades about the vertical hinges as they rotate, prevent shock to the blades when the main rotor head assembly is started or stopped, and positions the blades against the lag stops after rotor shutdown.
three degrees of corrosion
Light corrosion, moderate corrosion, and severe corrosion.
State the three models of the T-64 engine and their respective shaft horse power
T64-ge-416: 4380 SHP
T64-GE-416A 4380 SHP
T64-GE-419 4750 SHP Contingency capability power up to 5,000 SHP for up to two minutes
Rotor RPM
Power Turbine Speed
Gas Generator Speed
Power inlet turbine temperature
Compressor inlet temperature
Outside air temperature
NATO # F-40
NATO # F-44
NATO # F-34
State the types of fuel authorized for shipboard use
JP5 NATO # F-44
A junction or connection of two unlike metals
2. State the output of the aircraft generators
a. Voltage: 115 VAC
b. Phase: Three-phase
c. Frequency: 400 HZ, normal rating of 40 KVA
emergency exit lights
emergency lighting when the helicopter DC electrical system fails, upon or impact of 10 g’s or when Emerson switches at floor level are immersed in water.
a. High Frequency (HF).
3-30 MHz
b. Very High Frequency
30-300 MHz
c. Ultra High Frequency. (UHF)
300-3000 MHz
NAVAIR 01-700
Airborne Weapons/Stores Publications index provides activities with a guide to ensure that all existing changes have been incorporated in conventional/special weapons checklist, stores reliability cards (SRC) an manuals on hand and that these publications are the most recent available.
attached to an anchor
. Ground
rest on or can become buried in the seabed and is held in position by its own weight
Drifting, Oscillating, creeping, mobile, homing, rising and bouquet mines.
a mine, which is fired, by physical contact between the target and the mine
mine, which is fired by the effect of a target-created influenced in the vicinity of the mine, or a radiation emanating from the mine
Mines that can be fired by either a cable or by transmitting a low frequency signal
risk directives.
The primary concern is to minimise the risk to the MCM assets. The timely completion of the task is of secondary importance
risk directives.
Balances the risk to the MCM assets and the time available in order to complete the task.
risk directives.
The primary concern is the timely completion of the task. Risk to MC assets is of secondary importance
Q-route survey
A process of searching and mapping all significant contacts along a pre planned dormant shipping lane or channel
Precursor MCM operations
An operation in an area or channel is in relatively safe methods and techniques in order to reduce the risk to MCM vehicles
Leadthrough operations
An operation that assists traffic in the transit of parts of a mined area that has previously been subject to an MCM effort
Mine Danger area (MDA
An area varying in size drawn around the position of each discovered mine for initial estimate of the minefield.
entering suspected mined waters:
entering suspected mined waters: ACTIVe
The use of MCM forces to physically remove or disable mines
Mine hunting
searching the sea bed/ or water volume for mines
Process of using either mechanical or influenced sweep gear
Reaction to minesweeping
The lack of mines explosion after a period of minesweeping does not necessarily indicate that no mines are present.
Mine hunting and minesweeping relationship
The primary relation between mine hunting and minesweeping is governed by the nature, extent, and density of the threat.
Length Folded/Spread
71 ft o.2 in. / 99 ft 0.5 in
Width folded/spread
27 ft 7 in / 79 ft o in
: 28 ft 4 in top of rudder, blade vertical, 18 ft 7 in. minimum, pylon folded
1st stage hydraulic power
provides hydraulic power to assist in flight control.The first stage hydraulic system powers the first stage side of the main rotor servo.
Hydraulic in flight refill
provides a means for in-flight refilling of the hydraulic system
2nd stage hydraulic power
powers the second stage side of the main rotor servos.
Utility 1 hydraulic power
The utility hydraulic system provides those hydraulic functions not normally associated with helicopter flight controls, such as landing gear operation, blade and pylon fold, and cargo ramp and overhead cargo ramp and overhead door operations. It also supplies hydraulic pressure to the second stage side of the tail rotor servo and the second stage side of the AFCF servos.
Utility 2 hydraulic power
supply hydraulic power to all AMCM mission peculiar equipment
Collective Stick
Left side of the pilot’s seat operates simultaneously to change the collective pitch of the main rotor blades and change tail rotor pitch
Mixing unit (control coupling
The mixing unit make these couplings: collective to yaw, collective to pitch, collective to roll, yaw to pitch, and yaw to roll. These couplings provide automatic proportional transfer between the axes when the appropriate control is moved.
Automatic Flight Control System (AFCF) servos
The four AFCS servos (pitch, roll, yaw, and collective) provide an interface between electrical inputs supplied by the AFCS computer, the pilots flight control an the mechanical flight control system.
Tail rotor control system
The system compensates for main rotor torque and permits changing the heading of the helicopter.
Swashplate assembly
consists of a rotating Swashplate, driven by the main rotor hub assembly, and a stationary Swashplate that is secured to the main gearbox by a scissors assembly to prevent rotation
Main rotor head positioning system
Positions the main rotor head correctly for blade fold and pylon fold and engine start.
Main rotor head
The main rotor head is mounted directly to the output shaft of the main gearbox, consists of a hub assembly and a Swashplate assembly.
Tail rotor head
The tail rotor assembly privides yaw for the helicopter by varying the pitch of the blades by means of the pitch beam and link assembly
Pitch control links
The links transmit movements required for blade pitch change from the pitch beam.
Pitch locking/flight Control Position Indicating system
locks the pitch of the main rotor blades at the proper angle for blade fold.
Auxiliary Power Plant (APP
enables ground starting of the engines and ground operation of the electrical and hydraulic systems.
1 Engine is
left side of the fuselage
2 Engine is
behind the main gear box (MGB)
3 Engine is
right side of the fuselage
Torque sensor shaft:
This assembly transmits power to the NGB from the NO#1 & 3 engine.
It is a 14 stage compressor rotor assembly which compresses air for combustion
each are located fwd of the #1 and #3 engines. The purpose to reduce the engine rpm from 14,280 rpm to 6323 rpm for input to the main gear box (MGB).
Main gear box is mounted above the cabin.
Provides output power to the main rotor head, tail rotor head, and accessory gear box.
. Accessory gear box (AGB) is mounted fwd of the main gear box.
It drives #1 and #3 generator, utility 1, and utility 2, second stage, engine start pump
The intermediate gear box (IGB)
is mounted at the base of the tail rotor pylon. The purpose is to change the angle of the drive & reduces rpm from 4271 rpm to 2628
Tail rotor gear box (TRGB) is located at the upper end of the tail rotor pylon.
The purpose is to provide power transmission through a right angle & reduction of rpm from 2628 rpm to 699
State the location and function of the drive shafts and disconnect coupling.
The TRDC extends from the tail take off coupling flange at the accessory section of the MGB to the TRDC, from the TRDC to the IGB, from the IGB to the TGB. The TRDC is between the #6 and #5 TRDC shaft. The purpose of the TRDC shaft is to transmit engine torque to the TRH via the MGB, the TRDC allows for folding of the tail rotor pylon.
Total fuel in gallons is
#1 914.6
#2 1383.2
#3 914.6
Engine Air Particle Separator (EAPS) system.
Removes visible moisture, sand, dirt, and other FOD. Scavenges & expels FOD over
High Frequency (HF)
Communication: Used for long range communications
Very High Frequency (VHF):
Line of sight communications
Ultra High Frequency (UHF):
Line of sight communications
Precise Navigation System (PNS):
Designed to facilitate control of the helicopter during AMCM operstions by providing the pilot with essential real-time minefield navigation information. Produces a simulated grid-line.
Low-Frequency Automatic Direction Finder (LF/ADF):
An automatic direction finder that uses an AM band. “No distance measuring equipment (DME)”
. Alternating current (ac) generators
Provides 3 phase 115 VAC at 400 HZ
Direct current (dc) converters (transformer rectifier):
Transforms 115 to 28 VDC
Fire Detection system.
Comprised of
Infared detecting devices in the engines and APP. Warns Pilots and crew of engine and APP fires.
fire extinguisher systems:
APP/Heater: It is mechanical activated and used to put fires out in the APP/Heater area
fire extinguisher systems:

b. Engine Compartment: Electrical discharged, and used to put out fires in the engine compartments the have a main and reserve
. Anti-collision
Red and white mounted on the tail and under the cockpit, Used for aircraft recognition
Rotor headlight:
White mounted forward of the swashplate to aid identify droop stop position at night.
Digital Automatic Flight Control System (DAFCS).
Electro-hydro-mechanical system used to assist the pilot in handling and manoeuvring the aircraft by entering corrections and control signals into the flight controls.
a. MK 25 MLM
To provide day or night reference points, marking that calls for smoke or flame for a period of 13.5 to 18.5 minutes.
To provide day or night reference points, marking that calls for smoke or flame for a period of 40 to 60 minutes.
Hoist cads:
An electrically operated guillotine type cartridge controlled by switches in the cockpit (pilot/copilot) and cabin (Crew). Allows the pilot, copilot or crewmember to cut the hoist cable if the hook becomes entangled in surface obstacles and cannot be released. One per aircraft.
Fire Bottle cads:
Electrically actuated to discharge the fire bottles. There are two CADS on each MK-105 Sled. There are two CADS per engine (total of 6).
Cargo Hook cads
(Explosive Separator) Electrically actuated to separate the pendant and hook from the frame.
Guillotine cads:
Electrically actuated used to cut the sweep and tow wires in the event of an emergency. Attached to tow cable(s) after the tow ball has been inserted into the hook. One port and one stbd.
Command/Control/Communications. Primary
Fleet Support Operations. Primary
MIne Warfare. Primary.
INTelligence. Secondary
LOGistics. Primary.
MOBility. Primary.
Required Operational Capabilities (ROC) for fleet Helicopter Mine Countermeasures (HM) squadrons.
Operate a 10 aircraft MH-53 integrated airborne mine countermeasures squadron consisting of 6 active and 4 reserve aircraft capable of maintaining a seven aircraft 72 hour rapid response posture
Projected Operational Environment (POE) for fleet HM squadrons.
Operate a 10 aircraft MH-53E integrated airborne mine countermeasures squadron, consisting of 6 active and 3 three reserve aircraft from fixed land base, aircraft carriers, and amphibious aviation ships. Specific information pertaining to HM-15
What is the primary
mission of the MH-53E?
Aircraft Mine Countermeasures which includes minesweeping, mine neutralization, mine hunting, floating mine destruction, channel marking and surface towing of surface craft and small ships.
What is the secondary mission of the MH-53E?
Utility mission involving the movement of cargo and equipment and the transportation of passengers. Capable of rescuing personnel during an over water or over land hover.
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