Revolutions Per Minute.
The maximum power available from an engine for takeoff, limited to
periods of five minutes duration.
Control and Instrument Terminology.
Condition Lever (Fuel Shut-off
The fuel shut-off lever actuates a valve in the fuel control unit which
controls the flow of fuel at the fuel control outlet and regulates the idle
range from LO to HIGH.
Interstage Turbine Temperature
Eight probes wired in parallel indicate the temperature between the
compressor and power turbines.
Nt Tachometer (Gas Generator
The tachometer registers the RPM of the gas generator with 100% rep-
resenting a gas generator speed of 37,500 RPM.
Power Lever (Gas Generator N1
This lever serves to modulate engine power from full reverse thrust to
takeoff. The position for idle represents the lowest recommended level
of power for flight operation.
Propeller Control Lever (N2
This lever requests the control to maintain RPM at a selected value
and, in the maximum decrease RPM position, feathers the propeller.
This Governor will maintain the selected propeller speed requested by
the propeller control lever.
The torquemeter system determines the shaft output torque. Torque
values are obtained by tapping into two outlets on the reduction gear
case and recording the differential pressure from the outlets.
Graph and Tabular Terminology.
Best Angle of Climb
Best Rate of Climb
Maximum Zero Fuel Weight
Obstacle Clearance Climb
Above ground level.
The best angle-of-climb speed is the airspeed which delivers the great-
est gain of altitude in the shortest possible horizontal distance with
gear and flaps up.
The best rate-of-climb speed is the airspeed which delivers the greatest
gain of altitude in the shortest possible time with gear and flaps up.
Gear and flaps up regardless of mission antenna installation.
The maximum 90° crosswind component for which adequte control of
the aircraft during takeoff and landing was actually demonstrated dur-
ing certification tests.
The ratio of the change in height to the horizontal distance, usually
expressed in percent.
The weight of the aircraft at landing touchdown.
Any weight above the value given must be loaded as fuel.
Minimum Enroute Altitude.
Obstacle clearance climb speed is a speed near Vx and Vy 1.1 times
power off stall speed, or 1.2 times minimum single-engine stall-speed,
whichever is higher.
The gross weight of the aircraft before engine start. Included is the
takeoff weight plus a fuel allowance for start, taxi, run up and takeoff
grond roll to liftoff.
A part of a route. Each end of that part is identified by:
a. A geographic location; or