t-39 - Chief of Naval Air Training
t-39 - Chief of Naval Air Training
t-39 - Chief of Naval Air Training
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T-<strong>39</strong> FLIGHT PREPARATION STUDENT GUIDE<br />
G-6<br />
overboosting the engines at higher altitudes. Safe single engine speed is 133 KIAS.<br />
(Based on take<strong>of</strong>f thrust on good engine, maximum weight, gear and flaps up, and<br />
speedbrake retracted).<br />
(2) Climb Thrust: Climb performance is based on Maximum Continuous Thrust EPR<br />
Setting for both 1 and 2 engine operation. This is to be used for climb and acceleration<br />
and should not be used for normal operations.<br />
(3) Cruise (Service) Ceiling: Corresponds to a rate <strong>of</strong> climb <strong>of</strong> 100 FPM<br />
b. Factors affecting climb performance<br />
(1) Temperature: Variations in outside air temperature from the ICAO standard day<br />
(ISA) have significant affects on time, fuel and distance in climb and performance<br />
ceilings.<br />
(2) Operation <strong>of</strong> Anti-Ice Systems: The operation <strong>of</strong> anti-ice systems during climb will<br />
result in decreased climb performance and lower performance ceilings<br />
(3) Engine Loss: The loss <strong>of</strong> an engine will significantly degrade climb performance<br />
and lower the performance ceilings <strong>of</strong> the aircraft. Time to climb, fuel to climb, and<br />
distance in climb will all increase, and performance ceiling will be lowered.<br />
4. CRUISE<br />
a. Factors Affecting Range Performance<br />
(1) Outside <strong>Air</strong> Temperature: Outside air temperature variations from the ICAO<br />
Standard Day have no effect on range when less than rated power is required. However,<br />
cruise time and fuel flow will be modified slightly because true airspeed and engine fuel<br />
consumption vary with temperature at a given Mach number. These relationships are true<br />
whether cruising at maximum range (climbing flight path) or constant altitude. For<br />
maximum range cruise where rated power is required (such as 1 engine operation), an<br />
increase in temperature means a reduction in range, altitude, Mach number, time, and an<br />
increase in fuel flow. For constant altitude cruise at rated power, an increase in<br />
temperature reduces the maximum allowable weight and Mach number that can be flown<br />
at that altitude.<br />
(2) Wind: When winds are calm, ground speed equals true airspeed. When flying into<br />
a headwind, ground speed equals true airspeed less the headwind component. When<br />
flying with a tailwind the reverse is true. Additionally, wind affects maximum range<br />
values as a result <strong>of</strong> changes in maximum-range true airspeeds. When striving for<br />
maximum range, it is advantageous to reduce the time <strong>of</strong> exposure to a headwind<br />
component and increase the time <strong>of</strong> exposure to a tailwind component.