Beechcraft C-12C Operator And Technical Reference Manual page 98

TM 1-1510-218-10
If average climb or descent flows are desired, add the values between altitudes and divide by
the number of values used. This method is preferred over averaging the extremes as some
flow characteristics vary in such a way as to yield an incorrect answer.
CABIN PRESSURE
ALTITUDE IN FEET
31,000
30,000
29,000
28,000
27,000
26,000
25,000
24,000
23,000
22,000
21,000
20,000
19,000
18,000
17,000
16,000
15,000
14,000
13,000
12,000
11,000
10,000
(1) Based on minute volume of 20 LPM-BTPS (Body Temperature and Pressure, Saturated).
(2) Use 100% oxygen above 20,000 feet.
(3) Not recommended for other than emergency descent use above 25,000 feet.
2-82
Table 2-5. Oxygen Flow Planning Rates vs Altitude
All flows in LPM per mask at NTPD
CREW MASK
NORMAL
(DILUTER DEMAND)
(1)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
0 (2)
3.6
3.9
4.2
4.5
4.8
5.1
5.4
5.8
6.1
6.5
6.9
NOTE
CREW MASK
100% OXYGEN
(1)
10.0
10.4
10.9
11.3
11.9
PASSENGER
MASK
4.2 3.7 (3)
4.4 3.7 (3)
4.7 3.7 (3)
5.0 3.7 (3)
5.3 3.7 (3)
5.6 3.7 (3)
5.9 3.7
6.2 3.7
6.6 3.7
6.9 3.7
7.2 3.7
7.6 3.7
7.9 3.7
8.3 3.7
8.7 3.7
9.1 3.7
9.5 3.7
3.7
3.7
3.7
3.7
3.7