Figure 5-6. Density Altitude Chart
Performance
Schweizer RSG, LLC.
Model 269D Helicopter
Pilot's Flight Manual
5-7
R
eissued: 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
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