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endurance and rate of climb lines indicate optimum
GW / cruise speed conditions for maximum endurance
and maximum rate of climb. These conditions require
minimum fuel flow (maximum endurance) and provide
maximum torque change for climb (maximum rate of
climb). This airspeed also represents the best single
engine airspeed.
7A-7-3. Conditions.
The cruise charts are based on 100% RRPM for ambient
temperatures of -10
C and above, and 98% and 100%
RRPM for ambient temperatures of -20
C and below.
7A-7-4. Performance Penalties with EAPS.
The engine performance loss with EAPS installed is
shown in the table 7A-7-1. The corrections shown in the
table are to be applied to the applicable performance
data shown in Chapter 7.
TM 1-1520-240-10
7A-7-2
Table 7A-7-1. EAPS Penalty Table
Pressure
OAT
Increase Total
Fuel Flow By
Decrease Torque Available (%)
Altitude (ft)
(
C)
(lb/hr) KTAS = 0 85 135 160
Seal Level -50 40 0 0 0 0
-40 40 0 0 0 0
-30 40 0 0 0 0
-20 40 0 0 0 0
-10 40 0 0 0 0
0 40 0 0 0 0
10 40 0 0 0 0
20 40 0 0 3 5
30 40 2 3 6 8
40 40 2 3 6 8
50 40 2 3 6 8
2000 -50 40 0 0 0 0
-40 40 0 0 0 0
-30 40 0 0 0 0
-20 40 0 0 0 0
-10 40 0 0 0 0
0 40 0 0 0 0
10 40 0 0 3 5
20 40 2 3 6 9
30 40 2 3 6 8
40 40 2 3 6 8
50 40 2 3 6 8
4000 -50 40 0 0 0 0
-40 40 0 0 0 0
-30 40 0 0 0 0
-20 40 0 0 0 0
-10 40 0 0 0 0
0 40 0 0 0 0
10 40 2 3 6 9
20 40 2 3 6 9
30 40 2 3 6 8
40 40 2 3 6 8
50 40 2 3 6 8
TM 1-1520-240-10
7A-7-3
Table 7A-7-1. EAPS Penalty Table (Continued)
Pressure
OAT
Increase Total
Fuel Flow By
Decrease Torque Available (%)
Altitude (ft)
(
C)
(lb/hr) KTAS = 0 85 135 160
6000 -50 35 2 2 5 6
-40 35 2 2 3 4
-30 35 1 0 1 2
-20 35 0 1 5 8
-10 35 2 3 7 9
0 35 2 3 7 9
10 35 2 3 6 9
20 35 2 3 6 9
30 35 2 3 6 8
40 35 2 3 6 8
50 35 2 3 6 8
8000 -50 35 2 2 5 6
-40 35 2 2 4 6
-30 35 2 2 4 6
-20 35 2 3 7 10
-10 35 2 3 7 9
0 35 2 3 7 9
10 35 2 3 6 9
20 35 2 3 6 9
30 35 2 3 6 8
40 35 2 3 6 8
50 35 2 3 6 8
10000 -50 30 2 2 5 6
-40 30 2 2 4 6
-30 30 2 2 4 6
-20 30 2 3 7 10
-10 30 2 3 7 10
0 30 2 3 7 9
10 30 2 3 6 9
20 30 2 3 6 9
30 30 2 3 6 8
40 30 2 3 6 8
50 30 2 3 6 8
TM 1-1520-240-10
7A-7-4
Table 7A-7-1. EAPS Penalty Table (Continued)
Pressure
OAT
Increase Total
Fuel Flow By
Decrease Torque Available (%)
Altitude (ft)
(
C)
(lb/hr) KTAS = 0 85 135 160
12000 -50 30 2 2 5 6
-40 30 2 2 4 6
-30 30 2 2 4 6
-20 30 2 3 7 10
-10 30 2 3 7 9
0 30 2 3 7 9
10 30 2 3 6 9
20 30 2 3 6 9
30 30 2 3 6 8
40 30 2 3 6 8
50 30 2 3 6 8
14000 -50 30 2 2 5 6
-40 30 2 2 4 6
-30 30 2 2 4 6
-20 30 2 3 7 10
-10 30 2 3 7 9
0 30 2 3 7 9
10 30 2 3 6 9
20 30 2 3 6 9
30 30 2 3 6 8
40 30 2 3 6 8
50 30 2 3 6 8
16000 -50 30 2 2 5 6
-40 30 2 2 4 6
-30 30 2 2 4 6
-20 30 2 3 7 10
-10 30 2 3 7 9
0 30 2 3 7 9
10 30 2 3 6 9
20 30 2 3 6 9
30 30 2 3 6 8
40 30 2 3 6 8
TM 1-1520-240-10
7A-7-5
Table 7A-7-1. EAPS Penalty Table (Continued)
Pressure
OAT
Increase Total
Fuel Flow By
Decrease Torque Available (%)
Altitude (ft)
(
C)
(lb/hr) KTAS = 0 85 135 160
18000 -50 25 2 2 5 6
-40 25 2 2 4 6
-30 25 2 2 4 6
-20 25 2 3 7 10
-10 25 2 3 7 9
0 25 2 3 7 9
10 25 2 3 6 9
20 25 2 3 6 9
20000 -50 25 2 2 5 6
-40 25 2 2 4 6
-30 25 2 2 4 6
-20 25 2 3 7 10
-10 25 2 3 7 9
0 25 2 3 7 9
10 25 2 3 6 9
20 25 2 3 6 9
TM 1-1520-240-10
7A-7-6
CRUISE EXAMPLE
EXAMPLE 1 (DUAL ENGINE)
WANTED:
SPEED FOR MAXIMUM ENDURANCE
SPEED FOR MAXIMUM RANGE
MAX. SPEED AT CONTINUOUS TORQUE RATING
ESTIMATED AIRSPEED LIMIT WITH CRUISE GUIDE
INDICATOR (CGI) OPERATIVE
KNOWN:
GROSS WEIGHT = 50,000 LB.
PRESSURE ALTITUDE = SEA LEVEL
FAT = 30
C
METHOD:
READ SPEEDS WHERE GROSS WEIGHT LINE
INTERSECTS PERFORMANCE OR LIMIT LINE
MAXIMUM ENDURANCE: TAS = 89 KN, IAS = 83 KN
MAXIMUM RANGE: TAS = 144 KN, IAS = 140 KN
MAX SPEED (CONTINUOUS TORQUE RATING):
TAS = 152 KN, IAS = 149 KN
AIRSPEED LIMITED BY VCGI.
EXAMPLE 2 (DUAL ENGINE)
　
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