t-39 - Chief of Naval Air Training

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T-39 FLIGHT PREPARATION STUDENT GUIDE G-2 KEAS Knots Equivalent Airspeed KIAS Knots Indicated Airspeed KN or KT Knots True Airspeed KTAS Knots True Airspeed LB/GAL Pounds Per Gallon LB/HR, pph Pounds Per Hour LB/HR/ENG Pounds Per Hour Per Engine LB/MIN Pounds Per Minute LSR Loose Snow on Runway M Mach Number MIN Minute MMO Maximum Mach Speed MSI Mach Speed Indicator NM Nautical Mile OAT, SAT Outside Air Temperature, Static Air Temperature - Actual air temperature that would be measured with the aircraft at zero velocity. OAT is obtained from meteorological sources. SAT is obtained from in-flight temperature measurement pph Pounds per Hour PSR Packed Snow on Runway RCR Runway Condition Reading RL Runway Length in Feet RSC Runway Surface Condition SEC Seconds SL Sea Level SLR Slush on Runway TAS True Airspeed TOF Takeoff Factor TOGW Takeoff Gross Weight V1 Decision Speed (critical engine failure speed) V2 Safe Single Engine Speed VMCA Minimum Controllable Airspeed, airborne (assumes single engine) Minimum Controllable Airspeed, ground (assumes single engine) VMCG
STUDENT GUIDE T-39 FLIGHT PREPARATION VMO Maximum Operating Speed VR Rotation Speed VREF Final Approach Speed at threshold (1.3 x Vso) VSO Stall Speed dirty VX Best Angle of Climb VXSE Best Angle of Climb, single engine VY Best Rate of Climb VYSE Best Rate of Climb, single engine WR Wet Runway, standing water WT Weight ZFW Zero Fuel Weight %RPM Revolutions Per Minute - measured in percent 2. TAKE-OFF a. Definitions (1) V1: The speed above which the takeoff is continued and below which the takeoff is abandoned in the event of an engine failure. (2) Refusal Speed: Used in conjunction with critical field length chart to determine speed at which an aircraft can either accelerate to refusal speed and then stop, or accelerate to refusal speed and continue takeoff while one engine is failed at refusal speed. All available remaining runway will be required to get the aircraft airborne. (3) V2: Must be not less than 1.1 x VMC or 1.2 VS and must be attained before reaching a height of 35 feet. (4) VR: The speed at which the aircraft is rotated to the takeoff attitude. VR must not be less than V1 or less than 1.05 x VMC. It must also be high enough to allow V2 to be attained before the aircraft reaches a height of 35 feet. (5) VS: The stalling speed or the minimum steady flight speed at which the aircraft is controllable. (6) VMCA: The speed required to provide sufficient control to fly a straight path over the ground with a failed engine. This speed is based on the engine windmilling, takeoff thrust on the good engine, and no more than 5º bank away from the failed engine. At minimum control speed, it may be necessary to sacrifice altitude for airspeed while putting the aircraft in clean configuration and obtaining sufficient airspeed to climb. G-3
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NAVAL AIR TRAINING COMMAND NAS CORP
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t-39 - Chief of Naval Air Training

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