TM 1-1510-225-MTF
*SPEED PERFORMANCE AT MAXIMUM CRUISE
POWER
NOTE
A new or rebuilt engine operated at the torque
value presented in the Maximum Cruise Speed
and Power chart (figure 4) will show a ITT mar-
gin below the maximum cruise limit for the torque
value presented in the table. Cruise torque settings
shown on the Maximum Cruise Speed and Power
chart (figure 4) shall be obtained without exceed-
ing ITT limit (780°C).
Speed-power runs shall be made in smooth air with engine
anti-ice off at 16,000 and 25,000 feet to determine conformity
with performance figures. Determine torque settings, fuel
flow, and airspeed to be achieved by referencing Maximum
Cruise Speed and Power Chart (figure 4).
1. Altitude - 16,000 feet pressure altitude.
2. Record the following:
(a) Engine serial number.
(b) Engine hours since new.
(c) Engine hours since overhaul.
3. Propeller RPM - 1800 RPM.
4. Engine anti-ice - OFF.
5. FAT - Determine and note.
6. Power setting - Read torque for the noted FAT from
figure 4.
7. Set torque on left and right engines to the torque from
figure 4.
8. Verify that pilot’s and copilot’s airspeed indicators
agree within 4 KIAS, and that neither indicator reads
more than 3 KIAS less than the chart value.
9. Allow conditions to stabilize for one minute, then
record the following for each engine being tested.
(a) Pressure altitude
4-4
