AIRCRAFT FLIGHT
MANUAL
BRISTELL B23
Document No.: ADXC-73-001-AFM
Non-approved page
Revision: A2
5-3
Date of Issue: 15.04.2021
5.1.2 Pressure to density altitude conversion
Conversion Pressure Altitude to Density Altitude
0
2000
4000
6000
8000
10000
12000
14000
-40 -30 -20 -10 0
10 20 30 40
OAT [C]
Pr
es
su
re
A
lt
it
u
d
e
[f
t]
0
2000
4000
6000
8000
10000
12000
14000
D
en
si
ty
A
lt
it
u
te
[
ft
]
P ro c e dure
A.) Lo c a te P re s s ure Altitude o n IS A c o nditio n line
B .) F ind inte rs e c tio n o f OAT with is o ba re line s
C .) R e a d De ns ity Altitude o n right s c a le
Exa m ple : P re s s ure Altitude = 8500ft, OAT = -6C ; R e s ult: De ns ity Altitude = 8000ft
A
B
C
Procedure:
A.) determine pressure altitude by ISA-conversion
B.) determine intersection of outside air temperature with isobar line
C.) read density altitude on right side of diagram
Example: pressure altitude = 8500ft, outside air temp. =-6C; result: densty altitude = 8000ft
P
re
s
s
u
re
a
lt
it
u
d
e
[
ft
]
D
e
n
s
it
y
a
lt
it
u
d
e
[
ft
]
Outside air temp. [C]
Conversion Pressure Altitude to Density Altitude
0
2000
4000
6000
8000
10000
12000
14000
-40 -30 -20 -10 0
10 20 30 40
OAT [C]
Pr
es
su
re
A
lt
it
u
d
e
[f
t]
0
2000
4000
6000
8000
10000
12000
14000
D
en
si
ty
A
lt
it
u
te
[
ft
]
P ro c e dure
A.) Lo c a te P re s s ure Altitude o n IS A c o nditio n line
B .) F ind inte rs e c tio n o f OAT with is o ba re line s
C .) R e a d De ns ity Altitude o n right s c a le
Exa m ple : P re s s ure Altitude = 8500ft, OAT = -6C ; R e s ult: De ns ity Altitude = 8000ft
A
B
C
Procedure:
A.) determine pressure altitude by ISA-conversion
B.) determine intersection of outside air temperature with isobar line
C.) read density altitude on right side of diagram
Example: pressure altitude = 8500ft, outside air temp. =-6C; result: densty altitude = 8000ft
P
re
s
s
u
re
a
lt
it
u
d
e
[
ft
]
D
e
n
s
it
y
a
lt
it
u
d
e
[
ft
]
Outside air temp. [C]