T-6B Limits

Question 1

Takeoff / Max torque:

Answer 1

100%

Question 2

IDLE torque limits:

Answer 2

1 to 10% (ground). Allowable torque range with Np stabilized and PCL at IDLE.

Question 3

Transient torque limits:

Answer 3

132 MAX (20 sec). 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 4

ITT limits. Takeoff / MAX:

Answer 4

820 degrees C, max for TAKEOFF/MAX

Question 5

ITT limits. IDLE:

Answer 5

750 degrees C, max at IDLE

Question 6

ITT limits. START:

Answer 6

871-1000 degrees C (5 sec)

Question 7

ITT limits. TRANSIENT:

Answer 7

821-870 degrees C (20 sec)

Question 8

N1 limits. Takeoff/Max:

Answer 8

104% Max

Question 9

N1 limits. IDLE:

Answer 9

60% to 61% (ground). 67% min flight

Question 10

N1 limits. TRANSIENT

Answer 10

104% Max

Question 11

Np limits. TAKEOFF / MAX

Answer 11

100% Max. With PMU OFF, permissible maximum Np is 100+/-2%.

Question 12

Np limits. IDLE

Answer 12

46% to 50% (ground)

Question 13

Np limits. TRANSIENT

Answer 13

110% (20 sec) Permissible at all powers for completion of in-flight emergency.

Question 14

OIL Pressure limits. TAKEOFF/MAX:

Answer 14

90 to 120 psi. 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 15

OIL Pressure limits. IDLE:

Answer 15

90 psi Min

Question 16

OIL Pressure limits. START:

Answer 16

200 psi Max

Question 17

OIL Pressure limits. TRANSIENT:

Answer 17

40 to 130 psi. Operation in this range permitted only during aerobatics of spins, and 15 to 40 psi for 5 seconds with PCL at IDLE.

Question 18

OIL Temp limits. TAKEOFF/MAX:

Answer 18

10 to 105 degrees C.

Question 19

OIL Temp limits. IDLE:

Answer 19

-40 to 105 degrees C (Gnd), 10 to 105 (Flt), 106 to 110 - acceptable for ground operation at and below 20% torque.

Question 20

OIL Temp limits. START:

Answer 20

-40 degrees C Min

Question 21

OIL Temp limits. TRANSIENT:

Answer 21

106 to 110 degrees C (10 minutes)