T-6 Limits

Question 1

Battery Start Limitations

Answer 1

Do not attempt a battery powered ground start of the battery voltage is below 23.5 volts.

Question 2

External Power Limitations

Answer 2

Do not connect external power if battery voltage is below 22.0 volts.

Question 3

Takeoff/Max Torque %

Answer 3

100 Max

Question 4

Takeoff/ Max ITT °C

Answer 4

820 Max

Question 5

Takeoff/ Max N1%

Answer 5

104 Max

(1) N1 Values presented for PMU ON. With the PMU OFF, N1 may vary from these values.

Question 6

Takeoff/ Max Np%

Answer 6

100 Max

(4) Avoid stabilized ground operation from 62 to 80% Np?
(2) With PMU OFF, permissible maximum Np is 100+/-2%.

Question 7

Takeoff/ Max Oil Pressure psi

Answer 7

90 to 120

(6) Normal oil pressure during steady state conditions is 90 to 120 psi. Operation at oil pressure less than 90 psi at flight idle or above is indicative of oil system malfunction.

Question 8

Takeoff/ Max Oil Temp °C

Answer 8

10 to 105

Question 9

Idle Torque %

Answer 9

1 to 10% (ground)

(9) Allowable torque range with Np stabilized and PCL at IDLE.

Question 10

Idle ITT °C

Answer 10

750 Max

Question 11

Idle N1%

Answer 11

60 to 61 (ground)
67 Min (flight)

(1) N1 Values presented for PMU ON. With the PMU OFF, N1 may vary from these values.

Question 12

Idle Np%

Answer 12

46 to 50 (ground)

(4) Avoid stabilized ground operation from 62 to 80% Np.

Question 13

Idle Oil Pressure psi

Answer 13

90 Min

Question 14

Idle Oil Temp °C

Answer 14

-40 to 105 (ground)
10 to 105 (flight)
106 to 110 (7)

(7) Acceptable for ground operation at and below 20% torque.

Question 15

Start ITT °C

Answer 15

871-1000 (5 sec)

Question 16

Start Oil Pressure psi

Answer 16

200 Max

Question 17

Start Oil Temp °C

Answer 17

-40 Min

Question 18

Transient Torque %

Answer 18

132 Max (20 sec)

(8) Torque at 132% is a materials limit above which damage to the engine may occur. Torque above 102% is indicative of a system malfunction.

Question 19

Starter Limitations

Answer 19

1st - Motor 20 seconds then, 30-second cooling period
2nd - Motor 20 seconds then, 2-minute cooling period
3rd - Motor 20 seconds then, 5-minute cooling period
4th - Motor 20 seconds then, 30-minute cooling period

Question 20

Generator Limits

Answer 20

Inflight: +50 to -2 AMPS
Ground/Inflight Voltage: 28.0 to 28.5 Volts

Note: If generator amperage or voltage is continuously outside this range with the PCL at 80% N1 or greater while on the ground or in flight, notify maintenance after the mission. If generator voltage is continuously below 25.0 V, available battery power is degraded and air cruise and should land as soon as practical.

Question 21

Temperature Limitations

Answer 21

Maximum IOAT for start is 80°C

Ground operation is limited to ambient temperatures of -23°C to +43°C. Ground operation during ambient temperatures above 43°C is permitted for up to 15 minutes for the purpose of taxiing the aircraft to park.

Question 22

Propeller Ground Operation Limitations

Answer 22

Sustained propeller operation on the ground between 62 and 80% Np is prohibited to prevent damage from ground residence.

Question 23

Maximum Operating Airspeed/Maximum Operating Mach Number

Answer 23

316 up to and including 19,020

Mach 0.67 above 19,020

Question 24

Maneuvering Speed Limitations

Answer 24

227 KIAS

Full rudder deflection above 150 KIAS, however, will exceed the limits for the rudder control system.

Question 25

Zero G Time Limitations

Answer 25

Zero G is limited to 5 seconds maximum Caution: Holding a zero G-loading for over 5 seconds can cause engine damage and possible engine failure, regardless of Oil Pressure indications.

Question 26

Negative G Time Limits

Answer 26

Negative G operation (including inverted) is limited to 60 seconds. The following sustained negative G limitations ensure recovery of the center section fuel tank: 1. Negative G maneuvers within 60 seconds followed by 60 seconds upright (positive G) flight before conducting additional negative G maneuvers. 2. Do not exceed -2.5 G for negative operation longer than 30 seconds.

Question 27

Prohibited Maneuvers

Answer 27

``` Inverted Stalls Inverted Spins Aggravated spins past two turns Spins with PCL above idle Spins with landing gear, flaps, or speed brake extended Spins with PMU off Spins below 10,000’ PA Spins above 22,000’ PA Abrupt cross-controlled (snap) maneuvers Aerobatic maneuvers, spins, or stalls with a fuel imbalance greater than 50 pounds between wings Tails slides ```

Question 28

Symmetric Acceleration Limits

Answer 28

+7.0 to -3.5 G’s Gear and/or flaps extended +2.5 to 0.0 G’s

Question 29

Asymmetric Acceleration Limits

Answer 29

Clean +4.7 to -1.0 G’s Gear and/or flaps extended +2.0 to 0.0 G’s For uncontrolled rolling maneuvers initiated at -1 G, the maximum bank angle change is 180 degrees. Note: Exceeding the acceleration limits locks the max (or min) G reading on the PFD at the exceeded value in red text and cannot be reset without maintenance action on the ground.

Question 30

Weight Limitations

Answer 30

``` Ramp 6950 Takeoff 6900 Landing 6900 Zero fuel 5850 Baggage compartment 80lbs ```

Question 31

Landing Limitations

Answer 31

600 feet per minute (3.7 G’s) when main tires are serviced to normal landing conditions (185 +/- 5 psi) 780 feet per minute (5.1 G’s) when main tires are serviced to maximum landing conditions pressure (225 +/- 5 psi)

Question 32

Crosswind Limitations

Answer 32

Dry - 25 knots Wet - 10 knots Icy - 5 knots Max tailwind - 10 knots

Question 33

Icing Limitations

Answer 33

Sustained operation in icing conditions is prohibited. The aircraft has been approved only for transit through a 5,000-foot band of light rime ice. Maneuvers with ice accumulation are restricted to 30° bank angle and 0 to 2 G’s normal acceleration, up to stall warning system activation. For the landing configuration and during the landing phase, with ice accumulation, approach speed must be increased by 10 KIAS. To ensure safe landing, make sure that sufficient forward cockpit visibility exists from either the front or rear cockpit.

Question 34

Cockpit Pressurization System Limitations

Answer 34

Cockpit pressurization schedule limit is 3.6 +/- 0.2 psi CKPT PX warning illuminates at 3.9 to 4.0 psi Cockpit DP display changes to red and overpressurization safety valve opens at 4.0 psi

Question 35

Canopy Wind Limitations

Answer 35

The canopy shall not be opened on the ground when the surface winds exceed 40 knots