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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STUDENT GUIDE T-<strong>39</strong> FLIGHT PREPARATION<br />
VMO<br />
Maximum Operating Speed<br />
VR<br />
Rotation Speed<br />
VREF<br />
Final Approach Speed at threshold (1.3 x Vso)<br />
VSO<br />
Stall Speed dirty<br />
VX<br />
Best Angle <strong>of</strong> Climb<br />
VXSE<br />
Best Angle <strong>of</strong> Climb, single engine<br />
VY<br />
Best Rate <strong>of</strong> Climb<br />
VYSE<br />
Best Rate <strong>of</strong> Climb, single engine<br />
WR Wet Runway, standing water<br />
WT Weight<br />
ZFW Zero Fuel Weight<br />
%RPM Revolutions Per Minute - measured in percent<br />
2. TAKE-OFF<br />
a. Definitions<br />
(1) V1: The speed above which the take<strong>of</strong>f is continued and below which the take<strong>of</strong>f is<br />
abandoned in the event <strong>of</strong> an engine failure.<br />
(2) Refusal Speed: Used in conjunction with critical field length chart to determine<br />
speed at which an aircraft can either accelerate to refusal speed and then stop, or<br />
accelerate to refusal speed and continue take<strong>of</strong>f while one engine is failed at refusal<br />
speed. All available remaining runway will be required to get the aircraft airborne.<br />
(3) V2: Must be not less than 1.1 x VMC or 1.2 VS and must be attained before reaching<br />
a height <strong>of</strong> 35 feet.<br />
(4) VR: The speed at which the aircraft is rotated to the take<strong>of</strong>f attitude. VR must not<br />
be less than V1 or less than 1.05 x VMC. It must also be high enough to allow V2 to be<br />
attained before the aircraft reaches a height <strong>of</strong> 35 feet.<br />
(5) VS: The stalling speed or the minimum steady flight speed at which the aircraft is<br />
controllable.<br />
(6) VMCA: The speed required to provide sufficient control to fly a straight path over the<br />
ground with a failed engine. This speed is based on the engine windmilling, take<strong>of</strong>f<br />
thrust on the good engine, and no more than 5º bank away from the failed engine. At<br />
minimum control speed, it may be necessary to sacrifice altitude for airspeed while<br />
putting the aircraft in clean configuration and obtaining sufficient airspeed to climb.<br />
G-3