737 Operations Manual
Performance Inflight -
General
737-300/CFM56-3_22K
Copyright © The Boeing Company. See title page for details.
PI.10.18 D6-27370-400E-TBCE
Assumed Temperature Reduced Thrust (20K Derate)
Maximum Takeoff %N1 (Table 2)
Based on engine bleed to packs on (Auto) and engine anti-ice on or off
%N1 Adjustment For Temperature Difference (Table 3)
ASSUMED TEMP AIRPORT PRESSURE ALTITUDE (FT)
°C °F -1000 0 1000 2000 3000 4000 5000 6000 7000 8000
75 167 83.0 83.9 83.8 83.5
70 158 84.7 85.6 85.6 85.4 84.9 84.7
65 149 86.6 87.3 87.3 87.2 87.0 87.0 87.1 87.2 87.6 87.9
60 140 88.3 88.9 89.0 89.0 89.1 89.1 89.1 89.0 89.1 89.3
55 131 89.7 90.5 90.6 90.7 91.1 91.3 91.0 90.8 90.7 90.6
50 122 90.4 91.1 91.6 92.3 93.1 93.4 92.9 92.5 92.2 91.9
45 113 91.0 91.6 92.1 92.7 93.9 94.9 94.8 94.2 93.7 93.1
40 104 91.6 92.1 92.6 93.0 94.3 95.3 95.3 95.3 95.0 94.3
35 95 91.4 92.5 93.0 93.4 94.8 95.9 95.9 95.8 95.1 94.5
30 86 91.7 92.8 93.2 93.6 95.0 96.5 96.4 96.4 95.7 95.0
25 77 90.9 93.3 93.7 94.5 96.5 96.5 96.7 96.2 95.6
20 68 90.2 94.4 95.9 95.9
15 59 89.4 95.4
MINIMUM
ASSUMED TEMP
°C (°F)
32(90) 30(86) 28(82) 26(79) 24(75) 29(85) 27(81) 25(77) 20(68) 15(59)
With engine bleed to packs off, increase %N1 by 1.0.
ASSUMED TEMP
MINUS OAT
OUTSIDE AIR TEMPERATURE
°C °F
°C -40 -20 0 5 10 15 20 25 30 35 40 45 50 55
°F-40-43241505968778695104113122131
10 18 1.6 1.6 1.6 1.5 1.5 1.5 1.4 1.4 1.4 1.3
20 36 3.3 3.3 3.1 3.1 3.0 3.0 2.9 2.8 2.7 2.6 2.5 2.3
30 54 4.8 4.7 4.6 4.5 4.4 4.3 4.1 3.9 3.7 3.5 3.4 3.3
40 72 6.8 6.1 6.0 5.9 5.7 5.5 5.3 5.1 4.9
50 90 8.1 7.4 7.2 6.9 6.7 6.3
60 108 10.4 9.3 8.4 8.1 7.7
70 126 11.5 10.5 9.0
80 144 12.7 11.4 9.8
90 162 13.8 11.9
100 180 14.5 12.6
110 198 14.9
1. Determine Maximum Assumed Temperature allowed from Table 1.
2. Find Maximum %N1 from Table 2 using the desired assumed temperature (no greater than temperature
from Table 1).
3. Use the difference between assumed temperature and OAT to determine the %N1 adjustment from
Table 3.
4. Subtract %N1 adjustment from Maximum %N1 in Table 2.
December 07, 2001
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