PPL MonkeyPPL Monkey
de
Aircraft General Knowledge — AeroplanesLektion 34 von 55
34/55Pitot-static system and instruments

ASI markings

Lesezeit ca. 3 min·
en
Sprache wechseln (DE)

Learning objective: You decide from the colour arcs whether you are in the flap range, the normal range, or smooth-air caution — knot numbers come from the AFM, not from memory.

60 seconds: You are flying the approach, flaps out. Your seat-mate says: “Bottom of the green arc is Vfe, top of white is Vs1.” Stop. White low = Vs0, white high = Vfe. Green low = Vs1, green high = Vno. Yellow to Vne, then the red radial. Vs1 is the bottom of green, not the end of white.

The arcs live in CS-23.1545 and the type AFM/POH. The figure here is generic — no knots, not an AFM.

ASI colour arcs (generic, not AFM) White Vs0–Vfe, green Vs1–Vno, yellow Vno–Vne, red Vne. No knot values. Not an AFM/POH. ASI-Markierungen / ASI colour arcs Generisch — keine kt-Werte — nicht AFM/POH (Beispielbogen) Vs0 Vs1 Vfe Vno Vne Weiß: Vs0–Vfe (Klappen / flap range) Grün: Vs1–Vno Gelb: Vno–Vne Rot: Vne Grün und Weiß überlappen von Vs1 bis Vfe. Va ist meist ohne Bogen (AFM).

White and green overlap from Vs1 to Vfe. You can be in the white arc with flaps and already above clean stall. Colour is configuration, not two sealed worlds.

Va is usually not an arc (maneuvering — AFM). Vx / Vy / Vr are take-off performance speeds, not colour marks. A blue Vyse line is a multi-engine mark, not a PPL-single must.

“Vs1 is the end of the white arc.” That is wrong. People believe it when a drawing slaps Vfe and Vs1 on the same number. Vs1 sits above Vs0 and below Vfe.

Yellow is smooth air only between Vno and Vne. Turbulence: teaching often says “not above Va” — Va is not Vb/Vc; gust speeds are in the AFM.

Exam knowledge

  • White: Vs0–Vfe (flaps).
  • Green: Vs1–Vno (clean / normal).
  • Yellow: Vno–Vne, smooth air. Red: Vne.
  • Vs1 = bottom of green, not end of white. Overlap Vs1–Vfe.
  • Numbers only from the AFM. No C172 knots as a universal fact.
  • Va, Vx, Vy, Vr are not colour arcs.

Source: CS-23.1545 and typical EASA PPL 020 arc teaching. Figure generic, not AFM/POH.

Check yourself

1. The white arc on the airspeed indicator (ASI) runs from which speed to which, and what does it mean?

  • A) Vs1 to Vno — normal operating range, clean
  • B) Vno to Vne — caution range, smooth air only
  • C) Vs0 to Vfe — flap operating range
  • D) Vs1 to Vne — entire allowable range without flaps

2. What does the yellow arc on the ASI mean?

  • A) Smooth air only, between Vno and Vne
  • B) Normal operating range Vs1 to Vno
  • C) Flap operating range Vs0 to Vfe
  • D) Forbidden beyond Vne
  1. C — white arc = Vs0 to Vfe (flaps). A is the green arc, B the yellow.
  2. A — yellow = Vno to Vne, smooth air only. Beyond Vne is the red line.
Fertig gelesen?
Melde dich an, um deinen Fortschritt zu speichern.