Which parameter is defined as a range rather than a single value?

Which parameter is defined as a range rather than a single value?

• A. Maximum Continuous N1 99.5%
• B. Maximum Continuous ITT 960C
• C. Maximum Continuous Oil Temperature 155C
• D. Maximum Continuous Oil Pressure 45-95 PSI

Answer: (D)

In aviation limits, some parameters are given as a range to reflect how much the value can vary under different operating conditions and tolerances. The only option that uses a span is the oil pressure limit, shown as 45-95 PSI. This means continuous oil pressure may be anywhere between 45 and 95 PSI, depending on engine state, temperature, and other factors, and still be considered acceptable. The other limits are single maximum values: N1 is limited to a fixed percentage (99.5%), ITT to a single maximum temperature (960°C), and oil temperature to a single maximum (155°C). Those are threshold values, not ranges, indicating you should not exceed that specific value.

In aviation limits, some parameters are given as a range to reflect how much the value can vary under different operating conditions and tolerances. The only option that uses a span is the oil pressure limit, shown as 45-95 PSI. This means continuous oil pressure may be anywhere between 45 and 95 PSI, depending on engine state, temperature, and other factors, and still be considered acceptable. The other limits are single maximum values: N1 is limited to a fixed percentage (99.5%), ITT to a single maximum temperature (960°C), and oil temperature to a single maximum (155°C). Those are threshold values, not ranges, indicating you should not exceed that specific value.