Boeing 737 - Assumed Temperature Reduced Thrust (22 K Derate)

737 Operations Manual
Performance Inflight -
General
737-400/CFM56-3_23.5K
Copyright © The Boeing Company. See title page for details.
PI.20.20 D6-27370-400E-TBCE
Assumed Temperature Reduced Thrust (22K Derate)
%N1 Adjustment For Temperature Difference (Table 3)
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 1.5 1.4 1.4
20 36 3.3 3.2 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.5 2.3
30 54 4.8 4.8 4.6 4.5 4.4 4.3 4.0 3.8 3.6 3.6 3.6 3.6
40 72 6.0 6.2 6.1 6.0 5.8 5.7 5.2 5.0 5.0
50 90 8.2 7.5 7.3 7.2 6.6 6.5
60 108 10.4 9.5 8.7 8.1 7.9
70 126 11.8 10.7 9.3
80 144 13.0 11.8 10.1
90 162 14.0 12.4
100 180 15.0 12.8
110 198 15.4
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.
June 07, 2002