TM 55-1510-221-10
C H A P T E R 7
P E R F O R M A N C E
7-l. INTRODUCTION TO PERFORMANCE.
The graphs in this Section present performance
information for takeoff, climb, cruise, and landing at
various parameters of weight, altitude, and tempera-
ture.
The following example presents calculations for
a proposed flight from Denver to Reno using the
conditions listed below:
7-2. CONDITIONS.
At Stapleton International (DEN):
Free Air Temperature . . . . . . . . . . . . . . . . . . . . . . . . . .
28°C (82°F)
Field Elevation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5333 feet1
Altimeter Setting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30.02 in. Hg
Wind
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
030º at
13 knots
Runway 35R Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,000 feet1
Route of trip:
DEN - J116 - EKR - J173 - SLC - J154 -
BAM - J32 - RN0
Cruise Altitude:
26,000 feet
At Cannon International (RNO):
Free Air Temperature . . . . . . . . . . . . . . . . . . . . . . . . . .
32°C (90°F)
Field
Elevation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4412 feet1
Altimeter Setting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29.60 in. Hg
Wind
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
200º at 15 knots
Runway 25 Length
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6101 feet1
1
Source: NOAA Standard Instrument Depar-
tures for Western United States, 9 APR
1987.
2
Source: NOAA Enroute High Altitude -U.S.
Chart H-l, 9 APR 1987.
3
MEA on NOAA Enroute Low Altitude -U.S.
Chart L-8, 9 JUN 1983.
4 Includes distance between airport and
VORTAC, per
NOAA Airport/Facility
Directory (Southwest US.), 9 APR 1987.
7-3. PRESSURE ALTITUDE.
To determine the approximate pressure altitude
at origin and destination airports, add 1000 feet to
field elevation for each 1.00 in. Hg that the reported
altimeter setting value is below 29.92 in. Hg, and
subtract 1000 feet for each 1.00 in. Hg above 29.92
in. Hg. Always subtract the reported altimeter set-
ting FROM 29.92 in. Hg, then multiply the answer
by 1000 to find the difference in feet between field
elevation and pressure altitude.
Pressure Altitude at DEN:
29.92 in. Hg - 30.02 in. Hg = -0.10
-0.10 x 1000 feet = -100 feet
The pressure altitude at DEN is 100 feet
below field elevation.
Pressure altitude at DEN = 5333 - 100 = 5233 feet.
Pressure altitude at RNO:
29.92 in. Hg - 29.60 in. Hg = 0.32
0.32 x 1000 feet = 320 feet
The pressure altitude at RN0 is 320 feet
above field elevation.
Pressure altitude at RN0 = 4412 + 320 = 4732 feet.
7-4. PERFORMANCE EXAMPLE.
Maximum takeoff weight (from LIMITATIONS
Section) = 15,000 pounds
7-5. MAXIMUM TAKEOFF WEIGHT PERMITTED
BY ENROUTE CLIMB REQUIREMENT.
Enter the graph at 5233 feet take-off field pres-
sure altitude to 28°C takeoff FAT:
Maximum Allowable Takeoff Weight 14,200 pounds
The maximum takeoff weight permitted by the
Enroute Climb Requirement graph is the only oper-
ating limitation required to meet applicable FAR
requirements. Information has been presented, how-
ever, to determine the takeoff weight, field require-
ments, and takeoff flight path assuming an engine
failure occurs during the take-off procedure. The fol-
lowing illustrates the use of these charts.
7-6. TAKEOFF WEIGHT TO ACHIEVE POSITIVE
ONE-ENGINE-INOPERATIVE CLIMB AT LIFTOFF
(Flaps 0%).
Enter the graph at 5233 feet to 28ºC, to deter-
mine the maximum weight at which the acceler-
ate-go procedure should be attempted.
Maximum Accelerate-Go Weight . . . . 13,480 pounds
7 - 3
