What does the sequence 630-650, 99-101, 0-20 specify?

What does the sequence 630-650, 99-101, 0-20 specify?

• A. EGT range, RPM range, nozzle position
• B. Aircraft weight, wing incidence, throttle position
• C. AGL altitude, bank angle, vertical speed
• D. Engine torque, fuel flow, oil temperature

Answer: (A)

These numbers describe three engine parameters that pilots monitor together: exhaust gas temperature, engine speed, and nozzle position. The pair 630–650 corresponds to the exhaust gas temperature in degrees Celsius, indicating the turbine inlet temperature range during operation and helping ensure you stay within safe limits. The 99–101 represents the engine speed as a percent of maximum (N1/N2), with values around 100% showing near-full thrust. The 0–20 indicates the nozzle opening in degrees, where 0 is fully closed and 20 degrees is a typical open position for regulating exhaust flow and thrust. This combination—EGT range, RPM range, and nozzle position—fits the given numbers and their typical units, whereas the other options pair values that don’t align with these specific measurements (altitude or bank angle, vertical speed, or unrelated engine parameters like torque or oil temperature).

These numbers describe three engine parameters that pilots monitor together: exhaust gas temperature, engine speed, and nozzle position. The pair 630–650 corresponds to the exhaust gas temperature in degrees Celsius, indicating the turbine inlet temperature range during operation and helping ensure you stay within safe limits. The 99–101 represents the engine speed as a percent of maximum (N1/N2), with values around 100% showing near-full thrust. The 0–20 indicates the nozzle opening in degrees, where 0 is fully closed and 20 degrees is a typical open position for regulating exhaust flow and thrust.

This combination—EGT range, RPM range, and nozzle position—fits the given numbers and their typical units, whereas the other options pair values that don’t align with these specific measurements (altitude or bank angle, vertical speed, or unrelated engine parameters like torque or oil temperature).