TM 1-1520-240-105-3-1/(5-3-2 blank)SECTION III. POWER LIMITS5-3-1. Engine Rating and Power Level Limits.For variations in torque available with temperature andpressure altitude, refer to the Torque Available charts inChapter 7.5-3-2. 712 Emergency Power.Emergency power is only to be used during actual emer-gency conditions. After 30 minutes of emergency powertime have accumulated, the engine must be inspected5-3-3. 714A Contingency Power.Usage of contingency power 900_to 930_C PTIT is per-missible for an unlimited number of occurrences as longas each occurrence is 2 minutes 30 seconds or less.Maximum transient940_C PTIT is not to exceed 12 sec-onds.5-3-4. 712 Engine Limitations.See figure 5-2-1 for limitations. A gas producer (N1)overspeed exists when an N1 of 110 percent is exceed-ed. An N1 overspeed can cause overtemperature and/orovertorque. A power turbine (N2) overspeed may exist,depending on power being used, when 106 percentRRPM is exceeded.5-3-5. 714A Engine Limitations.See figure 5-2-1 for limitations. A gas producer (N1)overspeed exists when an N1 of 110 is exceeded. An N1overspeed can cause overtemperature and/or overtorque. A power turbine (N2) overspeed may exist, de-pending on power being used when 106% RRPM is ex-ceeded.5-3-6. 712 Engine Temperature Limitations.See figure 5-2-1 and 5-3-1.5-3-7. 714A Engine Temperature (PTIT) Limita-tions.See figure 5-2-1 and 5-3-1.5-3-8. Fuel Limitations.Only those listed in Chapter 2 shall be used. Emergencyfuel shall not be used for more than six hours cumulativetime.NOTEJP8+100 is not considered “EmergencyFuel”. A DA FORM 2408-13-1 entry will bemade as described in Appendix C.5-3-9. Transmission Torque Limitations (SteadyState). See figure 5-2-1 for limitations.NOTEAircrew should be alert to the potential forlarge engine torque oscillations during rear-ward flight operations.Figure 5-3-1. 712 Operational PTIT Limits
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