Robinson 44 Definitions and Abbreviations (5/17/2024)

Question 1

Vh

Answer 1

Stabilized level-flight speed at maximum continuous power.

The maximum speed that the helicopter can fly to ensure structural integrity and stability.

Question 2

KIAS

Answer 2

Knots Indicated Airspeed is speed shown on the airspeed indicator.

Question 3

KCAS

Answer 3

Knots Calibrated Airspeed is speed shown on the airspeed indicator corrected for instrument and position error.

Question 4

KTAS

Answer 4

Knots True Airspeed is airspeed relative to undistributed air. It is KCAS corrected for pressure altitude and temperature.

Question 5

BHP (Name and definition)

Answer 5

Brake Horsepower, Actual power output of the engine.

“brake”denotes the type of dynamometer that is used to access engine output at the crankshaft.

Question 6

MAP (Name and definition)

Answer 6

Manifold Absolute Pressure, is the absolute pressure in the engine intake manifold

Question 7

MCP (name)

Answer 7

Maximum Continuous Power

Question 8

TOP (name)

Answer 8

Takeoff Power (or 5-minute power)

Question 9

Critical Altitude

Answer 9

Maximum altitude at which full throttle produces maximum allowable power

Question 10

TOGW

Answer 10

Takeoff Gross Weight

Question 11

Reference Datum (location on the R44)

Answer 11

100 inches forward of the main rotor shaft

Question 12

Arm

Answer 12

Horizontal distance from a reference datum to the CG of an item

Question 13

Moment

Answer 13

Weight of an item multiplied by its arm

Question 14

Useful load

Answer 14

Difference between maximum gross weight and basic empty weight

Question 15

OAT

Answer 15

Outside Air Temperature

Question 16

CAT

Answer 16

Carburetor Air Temperature

Question 17

CHT

Answer 17

Cylinder Head Temperature

Question 18

GPH

Answer 18

Gallons Per Hour

Question 19

AGL

Answer 19

Above Ground Level

Question 20

IGE

Answer 20

In Ground Effect

Question 21

OGE

Answer 21

Out of Ground Effect

Question 22

ALT

Answer 22

Alternator

Question 23

Station

Answer 23

A fore-and-aft location along the helicopter fuselage usually given in terms of distance in inches from the reference datum.

Question 24

Center of Gravity (CG)

Answer 24

The point at which a helicopter would balance if suspended. Its distance from the reference datum is found by dividing the total moment by the total weight of the helicopter.

Question 25

CG Arm

Answer 25

The arm from the reference datum obtained by adding the helicopter’s individual moments and dividing the sum by the total weight.

Question 26

CG Limits

Answer 26

The extreme center gravity locations within which the helicopter must be operated at a given weight.

Question 27

Usable Fuel

Answer 27

Fuel available for flight planning.

Question 28

Unusable Fuel

Answer 28

Fuel remaining after a runout test has been completed in accordance with government regulations.

Question 29

Standard Empty Weight

Answer 29

Weight of a standard helicopter including unusable fuel and full operating fluids (i.e. hydraulic, engine oil, etc.).

Question 30

Basic Empty Weight

Answer 30

Standard empty weight plus weight of installed optional equipment.

Question 31

Payload

Answer 31

Weight of occupants, cargo, and baggage.

Anything that is paying to be on the aircraft.

Question 32

Useful Load

Answer 32

Difference between maximum takeoff weight and basic empty weight.

Question 33

Vy

Answer 33

Speed for best rate of climb

The airspeed at which the helicopter will get to a specific altitude in the shortest amount of time.

Question 34

Vne

Answer 34

Speed never exceed

Question 35

MSL Altitude

Answer 35

Altitude above mean sea level, indicated by the altimeter (corrected for instrument error)

Question 36

Pressure Altitude

Answer 36

Altitude indicated by the altimeter (corrected for instrument error) when the barometric subscale is set to 29.92

Question 37

Density Altitude

Answer 37

Pressure altitude, corrected for non-standard temperature

Question 38

ISA

Answer 38

International Standard Atmosphere exists when pressure is 29.92 and temperature is 15 C

Question 39

What is centrifugal force?

Answer 39

Pulls the blades outward

Question 40

What is centripetal force?

Answer 40

Pulls you inward (the moon is orbit because of this)