On the ground at MIL power, EGT, RPM and nozzle fall into which ranges?

On the ground at MIL power, EGT, RPM and nozzle fall into which ranges?

• A. 630-650, 99-101, 0-20
• B. 700-720, 110-120, 30-40
• C. 500-520, 80-82, 60-70
• D. 650-670, 100-102, 70-80

Answer: (A)

MIL power on the ground pushes the engine to near its maximum for that setting, so the RPM sits around 99–101 percent. With that high speed, fuel flow is also high, which raises the exhaust gas temperature to about 630–650 C. The exhaust nozzle stays largely closed to maintain the proper pressure and stable operation at this power level, typically opening only 0–20 degrees. This combination gives the required thrust without entering afterburner. Other ranges would imply operating at a different power setting or with a much larger nozzle opening that’s associated with afterburner or higher thrust conditions, which isn’t the expected state for MIL power on the ground.

MIL power on the ground pushes the engine to near its maximum for that setting, so the RPM sits around 99–101 percent. With that high speed, fuel flow is also high, which raises the exhaust gas temperature to about 630–650 C. The exhaust nozzle stays largely closed to maintain the proper pressure and stable operation at this power level, typically opening only 0–20 degrees. This combination gives the required thrust without entering afterburner. Other ranges would imply operating at a different power setting or with a much larger nozzle opening that’s associated with afterburner or higher thrust conditions, which isn’t the expected state for MIL power on the ground.