Figure 5-6. Density Altitude Chart
Performance
Schweizer RSG, LLC.
Model
269D
Helicopter
Pilot's Flight Manual
5-7
Reissued:
16
Jan 2019
EXAMPLE:
CONDITIONS: 6,000 FT PRESSURE ALTITUDE, -15°C OAT, 100 IAS
– FIND DENSITY ALTITUDE –
FOLLOW -15°C LINE TO 6,000 FT PRESSURE ALTITUDE
LINE: READ DENSITY ALTITUDE (3780 FT)
– FIND 1/
σ
(SIGMA) FACTOR –
READ DIRECTLY ACROSS FROM DENSITY ALTITUDE, (3780) = 1.058 = 1/
σ
(SIGMA)
100 IAS = 98.5 CAS
98.5 CAS X 1.058 = 104.2; ROUND TO 104.0 TRUE AIRSPEED
1/
TEMPERATURE, DEGREES F
DENSITY
ALTITUDE
X
1000
FEET
FAA Approved
Book 3.indd 131
8/4/19 1:25 PM