TM 1-1510-223-10 5-8           Change 3 Table 5-1.  Engine Operating Limitations OPERATING CONDITION TORQUE % (1) MAXIMUM OBSERVED TGT C GAS GENERATOR RPM N₁% PROP RPM N₂ OIL PRESS PSI (10) OIL TEMP C (2)         (3) STARTING -- 1000(4) -- -- 200 (max) -40 (min) LOW IDLE -- 750(5) 62 (min) 1000 (min) 60 (min) -40 to 110 HIGH IDLE -- -- (6) 1000 (min) -- -- TAKEOFF (5 MIN.) 100 840 104 1700 90 to 135 10 to 110 MAX. CONT. 100 830 104 1700 90 to 135 10 to 105 MAX CRUISE (7)(9) 810 104 (9) 90 to 135 10 to 105 MAX CLIMB (7)(9) 810 104 (9) 90 to 135 10 to 105 NORMAL CRUISE (7)(9) 800 104 (9) 90 to 135 10 to 105 NORMAL CLIMB MAX REVERSE 75 760 88 1650 90 to 135 10 to 105 TRANSIENT 138(8) 870(8) 104 1870(8) 40 (min) 200 (max) (8) -40 to 110 NOTES: The limits presented do not necessarily occur simultaneously. Whenever operation limits are exceeded the pilot will record the value and duration of the condition encountered on DA Form 2408-13. (1) Torque limit applies within range of 1000 to 1700 propeller RPM (N₂). Below 1000 RPM, torque is limited to 54%. (2) An engine oil temperature of 74 C to 80 C is recommended. (3) Oil temperature limits are -40 C to 105 C. However, temperatures of up to 110 C are permitted for a maximum time of 10 minutes. (4) These values are time limited to 5 seconds. (5) High TGT at ground idle may be corrected by reducing accessory load and/or increasing N₁ RPM. (6) At approximately 72% N₁. (7) Cruise torque values shall be set per Chapter 7. Operating the engines during cruise at higher torque values than those listed in Chapter 7 will reduce engine life. (8) These values are time limited to 20 seconds. (9) Torque limited to 94% when operating at 1500 RPM (N₂). Torque limited to 83% when operating at 1700 RPM (N₂). (10) Oil Pressures below 90 PSI are undesirable, under emergency conditions, a lower oil pressure limit of 60 PSI is permissible at reduced power, not to exceed 54% torque. Table 5-2.  Generator Load Limits GENERATOR LOAD MINIMUM GAS GENERATOR RPM - N₁ 0 to 95% 65% 95 to 100% 70%