1T-6A-1 T-6A Flight Manual: Section 6: Flight Characteristics Flashcards
Type of stability (6-4)
What type of stability does the T-6 have?
Positive stability in all configurations throughout the flight envelope.
Type of stability (6-4)
What is the definition of positive stability?
When an aircraft is disturbed by an external force, like turbulence, it will naturally tend to return to its original flight attitude, essentially correcting itself and regaining stability without pilot input.
Best VVI clean and configured (6-5)
Best glide speed in clean configuration?
Best glide speed in clean configuration is 125 KIAS with 1350 VSI
Best VVI clean and configured (6-5)
Best glide speed gear down flaps up?
Landing gear down, speed brake/flaps retracted best glide is 105 KIAS @ 1500fpm
Best VVI clean and configured (6-5)
What is glide performance affected by?
- Airspeed
- Configuration
- Angle of bank
- Coordinated vs uncoordinated flight
Stall warning - buffett vs stick shaker (6-5)
When does stick shaker occur?
5-10 knots above stall speed
Stall warning - buffett vs stick shaker (6-5)
When does buffett occur?
Natural stall warning approx. 3 knots above stall speed. Very noticable when uncoordinated.
Roll-off tendency >60% torque (6-5)
What is it?
Above 60% torque, full right rudder and full right aileron may not prevent left roll-off at stall.
Configuration effect on stalls (6-6)
Landing gear position?
Extending flaps?
Speed brake?
Landing gear position has little effect on stall characteristics
Extending flaps aggravates the roll-off tendency at stall
Speed brake extension or fuel imbalance (up to 50 lbs) have negligible effect on stall characteristics
Define OCF, poststall gyrations (6-7)
Define OCF
OCF = situation where aircraft does not respond immediately and in a normal sense to application of flight controls is considered out-of-control flight or a departure
OCF is the seemingly random motion of the aircraft about one or more axes, usually resulting from a stalled condition in which the inertial forces on the aircraft exceed the authority of the aerodynamic controls
Define OCF, poststall gyrations (6-7)
What are the 3 categories of OCF?
PIS
- Poststall gyrations
- Incipient spins
- Steady-state spins
Define OCF, poststall gyrations (6-7)
Define Poststall gyrations
motion of the aircraft about one or more axes immediately following stall
Define OCF, poststall gyrations (6-7)
Define Incipient spins
spin-like motion that occurs between poststall gyration and fully developed spin
Define OCF, poststall gyrations (6-7)
Define Steady-state spins
control input does not have an immediate effect in that axis in the normal sense of the control
Identify a spiral (6-10)
Rolling or yawing motion of the aircraft often mistaken for spin, not steady-state in that airspeed is increasing through 160 KIAS and motions are oscillatory
Can occur from misapplication of pro-spin controls
Neutralize controls and PCL to idle to recover
Reason for no spins below 10,000’ MSL (6-10)
- Prohibited due to high stresses on the propeller which occur during the spin maneuver with the propeller RPM below 80%
- PMU artificially maintains propeller RPM at 80% with the PCL at idle when the aircraft is above 10,000 feet pressure altitude
Erect spin AOA, airspeed, time, alt loss (6-10)
- Characterized by roll and yaw in the direction yaw is applied, resulting in a barrel roll maneuver to a near level attitude after completing the first turn
- 2-3 sec & 400-500 ft per turn, AOA 18+, and airspeed will stabilize 120-135 KIAS
Alt loss during erect spin recovery (6-11)
500 feet for every turn of spin with additional 1500-2000 feet for a normal dive recovery
