TM 1-1520-240-10
5-3-1/(5-3-2 blank)
SECTION III. POWER LIMITS
5-3-1. Engine Rating and Power Level Limits.
For variations in torque available with temperature and
pressure altitude, refer to the Torque Available charts in
Chapter 7.
5-3-2. 712 Emergency Power.
Emergency power is only to be used during actual emer-
gency conditions. After 30 minutes of emergency power
time have accumulated, the engine must be inspected
5-3-3. 714A Contingency Power.
Usage of contingency power 900_to 930_C PTIT is per-
missible for an unlimited number of occurrences as long
as each occurrence is 2 minutes 30 seconds or less.
Maximum transient 940_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/or
overtorque. A power turbine (N2) overspeed may exist,
depending on power being used, when 106 percent
RRPM 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 N1
overspeed can cause overtemperature and/or over
torque. 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. Emergency
fuel shall not be used for more than six hours cumulative
time.
NOTE
JP8+100 is not considered “Emergency
Fuel”. A DA FORM 2408-13-1 entry will be
made as described in Appendix C.
5-3-9. Transmission Torque Limitations (Steady
State).
See figure 5-2-1 for limitations.
NOTE
Aircrew should be alert to the potential for
large engine torque oscillations during rear-
ward flight operations.
Figure 5-3-1. 712 Operational PTIT Limits
