Instrument Rating Exam · Mock exam

For RVSM purposes, why must the aircraft use ISA (QNE) pressure setting above the transition altitude?

• A.ISA setting eliminates the need for any temperature correction to the altimeter reading in all conditions
• B.QNE gives better altimeter accuracy than QNH
• C.All aircraft use the same reference (1013.25 hPa / 29.92 inHg) above the transition altitude
• D.QNH is not accurate enough for RVSM operations