Turkish Virtual Airlines Forums

RULES OF THUMB

(a) TOD (Top of Descent) = 3 x (Current Altitude - Airport
Elevation) (e.g. 3 x 39,000ft - 1,500ft elev = 113nm
from airport). Use (b) to set şe appropriate vertical
speed based on TAS. Add 10% for unexpected tail
wind.

(b) Descent Rate (for 3o glide slope) = 5 x TAS (e.g. 5 x
400KTAS = 1200ft/min).

(c) Descent Altitude Check = glide slope angle x 100 x
Distance from RWY in nm (e.g. 3 x 100ft x 10nm =
3,000ft). For 4 o, 400 x Distance; for 5 o, 500 x D etc.

(d) TAS = [(IAS x 2%) x (ALT/1,000ft)] + IAS. So, if
IAS=300 and ALT=20,000: 300 x 0.02 x 20 + 300 = 420
kts TAS.

(e) Bank Angle for Std Turns (i.e. Props 3o/s or 360o in 2
min; Jets 1.5o/s or 360o in 4 min). Props: BA = (TAS /
10) +7; Jets: BA = (TAS / 10) x 0.75. Airliners: plan BA
to be max. 25o for passenger's comfort.

(f) Rollout Angle = BA / 2. (e.g. current HDG = 090;
desired HDG = 270; BA = 30; RA = 30 / 2 = 15; so start
RA when HDG 285 (i.e. 15o before reaching HDG 270 ).

Remzi Öztürk

Herkese merhaba! Descent rate hesaplamada bir yanlışlık var sanırım burda.TAS 400 knots ise *5=2000 ft per minute olması gerekmiyor mu descent rate.2000 olursa da alçalırken de hız artacak [?]

serhan tüzemen

FLYTHY 1789