H5-4 Heli Components (4.2-5) Flashcards
4-2 list the 7 major components of a helicopter
Main rotor system,
Airframe
fuselage,
Tail rotor system
transmission,
powerplant,
landing gear
H.4-2 What 4 thing does the fuselage house besides people? transmission
transmission
avionics
flight controls
powerplant
4-3 What is Mast bumping
When the inner face of the hub comes in contact with the mast. This usually due to low G conditions.
The disc looses lift and thrust simultaneously. Roll and pitch control in a teetering hinge rotor system is achieved by thrust producing a moment around the CG. No thrust and no moment leave the helicopter to be subject to other forces. Tail rotor thrust causes a roll to the right. If the pilot reacts incorrectly, due to flapping, the clearance between the mast and hub might be exceeded and mast bumping occurs.
4-4 What is a blade pitch horn.
controls the pitch change of the rotor blades
4-4 What is a bearingless rotor? What bearing doesn’t it have?
articulated rotors system but has no bearings or hinges.
no feathering bearing.
hub absorbs the stress
4-4 Pros and cons to Fully Articulated rotor systems (1,3)
+Good control response
-High aerodynamic drag,
-more complex
-greater cost.
4-4 Pros and cons to Semirigid rotor systems
+Simple
+ easy to hanger due to two blades
-Reaction to control input not as quick as articulate
=Vibration can be higher than multi bladed articulated system
4-4 Pros and cons to rigid rotor systems
+Simple
+ easy to hanger due to two blades
-Reaction to control input not as quick as articulate
=Vibration can be higher than multi bladed articulated system
4-9 the main difference between a turbo shaft and turbo jet engine is that
Most of the energy produced by the expanding gases is used to drive a turbine rather than producing thrust through the expulsion of exhaust gases
Yt Axial, flow compressors reach maximum efficiency when
At maximum rated RPM
Yt Centrifugal, flow compressors, maintain constant efficiency at
All RPM speeds
Yt Axial flow accelerates airflow on an axial vector guided by
Fixed blade stators to a general direction
Yt Centrifugal, flow, accelerates airflow outward on a radial vector by
By means of centrifugal force, also known as radial flow
4-11 If rotameter fails, rotor RPM can still be determined indirectly by…
The engine RPM during powered flight
because the engine drives the rotor have a fixed one-to-one ratio (by virtue of the sprang clutch)
4-12 What are the abbreviations for rotor RPM and engine RPM?
NR is for a rotor RPM display and NP is for engine RPM display
4-13 the fuel system in a helicopter is made up of what 2 components
Supply and control
4-13 In a helicopter, the fuel supply system consist of (4 to 6 things)
Fuel tank or tanks,
fuel quantity gauge,
a shut off valve,
a fuel line to the engine ,
and possibly a primer and fuel pumps
4-14 14 CFR 27.1337(b)(1)
Fuel quantity indicators must be calibrated to zero during level flight when the quantity of the fuel remaining in the tank is equal to be unusable fuel supply
4-8 The gas turbine engine mounted on most helicopter is made up of… (4)
a compressor,
combustion chamber,
turbine,
and accessory gearbox assembly
4-16 Generally helicopter have what kind of electrical system?
14 or 28 volt direct current electrical system
4-17 What is a SAS (Augmentation)
Stability Augmentations System
H.4-18 What are the most common 2 autopilots
Altitude and heading hold
4-18 What is the term used for an autopilot system that couples with instrument system? ie. VOR ILS
Coupled Systems
4-18 A two axis autopilot controls the helicopters…
A two axis autopilot controls the helicopter in pitch and roll
one servo controls fore and aft cyclic , and another controls left and right cyclic
4-18 A three - axis autopilot…
A three - axis autopilot has an additional servo connected to the antitorque pedals and controls the helicopter in yaw
4-18 A four - axis autopilot system…
A four - axis system uses a fourth servo which controls the collective
RAIL
Runway alignment indicator lights
RAIM
Receiver Autonomous Integrity Monitoring
RB
Relative Bearing
RCO
Remote communications outlet
REIL
Runway End Identifier Lightes (US Chart Sup)
Relative Wind
wind hitting the leading edge
RIME
Ice forms on contact
RMI
Radio magnetic indicator
RNAV
Area Navigation
RNP
Required Navigation Performance
RPM
Revelations Per Minute
S1
minor are frame
S2
minor airframe and minor power plant
S3
major airframe and minor power plant repairs
S4
major airframe and major power plant repairs
S5
major airframe repairs
S6
minor airframe and major power plant repairs
S7
major power plant repairs
S8
minor power plant repairs
