Required CAS
The calibrated airspeed to fly so the airplane trues out at a target TAS for the altitude and OAT — the inverse of the planned-TAS relation.
ALT & SPD
REQUIRED CAS5/32SOLVED
kt
ft
°C
Reading the screen: cyan is a value you entered, green is a computed result, amber means a field still needs input or the entry needs a CHECK. SOLVED lights when every result is computed; STO keeps a value to reuse in another function; the line-select keys beside the screen pick the field the keypad edits.
How this is computed
The calibrated airspeed to fly so the airplane trues out at a target TAS for the altitude and OAT — the inverse of the planned-TAS relation. Reproduces the ASA CX-3 manual's Required CAS example: 150 kt TAS at 6,500 ft and +5 °C → 135.6 kt CAS.
Keyboard shortcuts
- / or Ctrl+K — jump to the function search
- Digits, . or : (outside a field) — type into the scratchpad, then press a ◄ line-select key to insert
- Arrow keys — move around the keypad; Enter opens the focused function
- Home / End — start / end of a keypad row
- Alt+1…8 — jump to a keypad group