SPEED PERFORMANCE AT MAXIMUM CRUISE POWER

TM 1-1510-223-MTF

6. POWER levers Full forward (do not exceed TGT and/or No.

Maximum N. is 104%. Maximum TGT is 840C.

* D. 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 TGT margin below the maximum

cruise limit for the torque value presented in the table.

With ice vanes retracted, cruise torque settings shown on

the Maxi- mum Cruise Speed and Power chart (figure 4)

shall be obtained without exceeding TGT limits.

Speed-power runs shall be made in smooth air to determine

consistency with performance figures. Determine torque settings, fuel

flow, and airspeed to be achieved by referencing Maximum Cruise

Speed and Power Chart (figure 4).

Record the following:

*a. Engine serial number.

*b. Engine hours since new.

*c. Engine hours since overhaul.

Altitude 25,000 feet pressure altitude.

Propeller RPM 1700 RPM.

Ice vanes Retracted.

FAT Determine and record.

Power setting Read torque for the recorded FAT from figure 4.

Set torque on left and right engines to the torque from figure 4.

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.

Allow conditions to stabilize for one minute, then record the

following for each engine being tested.

4-4