TM 1-1510-225-10   5-13 Table 5-2.  Engine Operating Limitations  T3  F3 OPERATING CONDITION SHP TORQUE FT-LB (1) MAXIMUM OBSERVED ITT º C GAS GENERATOR RPM N₁  % PROP RPM N₂ OIL PRESS PSI (2) OIL TEMP º C (3) (4) STARTING – – – – – – 1000 (5) – – – – – – – – – -40 (min) LOW IDLE – – – – – – 700 (6) 58 (min) – – – 60 (min) -40 to 99 HIGH IDLE – – – – – – – – – (7) – – – – – – -40 to 99 TAKEOFF & MAX CONT 850 2230 800 101.5 2000 100-135 0 to 99 MAX CRUISE 850 2230 (8) 800 101.5 2000 100-135 0 to 99 CRUISE CLIMB AND REC (NORMAL) 850 2230 (8) 770 101.5 2000 100-135 0 to 99 CRUISE MAX REVERSE (9) 800 – – – 750 88 1900 100-135 0 to 99 TRANSIENT – – – 2750 (5) 850 102.6 (10) 2200 (5) – – – 104 (11) TABLE NOTES: (1)   Torque limit applies within range of 1600-2000 propeller RPM (N₂).  Below 1600 RPM, torque is limited to 1100 ft-lb. (2)   When  gas  generator  speeds  are  above  72%  N₁  and  oil  temperatures  are  between  60  °C  and  71  °C, normal oil pressures are:  100 to 135 psi below 21,000 feet and 85 to 135 psi at 21,000 feet and above. During  extremely  cold  starts,  oil  pressure  may  reach  200  psi.    Oil  pressure  between  60  to  85  psi  is undesirable; it should be tolerated only for the completion of the flight, and then only at a reduced power setting  not  exceeding  1100  ft-lb  torque.    Oil  pressure  below  60  psi  is  unsafe;  it  requires  that  either  the engine be shut down, or that a landing be made as soon as possible, using the minimum power required to sustain flight.  Fluctuations of ± 10 psi are acceptable. (3)   An  engine  oil  temperature  of  74  to  80  °C  is  recommended.    A  minimum  oil  temperature  of  55  °C  is recommended for fuel heater operation at takeoff power. (4)   Oil temperature limits are  -40 °C and  99 °C.  However, temperatures of up to 104 °C are permitted for a maximum time of 10 minutes. (5)   These values are time limited to 5 seconds. (6)   High ITT at ground idle may be corrected by reducing accessory load and/or increasing N₁ RPM. (7)   At approximately 70% N₁. (8)   Cruise torque values vary with altitude and temperature. (9)   This operation is time limited to 1 minute. (10)   These values are time limited to 10 seconds. (11)   Values above 99 °C are time limited to 10 minutes.