Viewing page 8 of 205



(2) Cautionary range -- 2500 to 2700 rpm,yellow arc.
(3) Normal operating -- 2300 to 2500 rpm, green arc.
(4) Minimum for flight -- 2300 rpm, red radial line.

b. Rotor:

(1) Maximum power-off -- 330 rpm, red radial line.
(2) Normal operating -- 237 to 330 rpm, green arc.
(3) Minimum power-off -- 237 rpm, red radial line.

4. Engine Oil Temperature:

a. Maximum -- 104°C (220°F), red radial line.
b. Normal operating -- 60 to 80°C (140 to 176°F), green arc.
c. Minimum -- 40°C (104°F), red radial line.

5. Carburetor Air Temperature:

a. Maximum -- 54°C (129°F), red radial line.
b. Normal operating -- 15 to 54°C (59 to 129°F), green arc.
c. Cautionary range -- minus 10 to 15°C (14 to 59°F), yellow arc.

6. Cylinder Head Temperature:

a. Maximum -- 260°C (500°F), red radial line.
b. Cautionary range -- 232 to 260°C (450 to 500°F), yellow arc.
c. Normal operating -- 100 to 232°C (212 to 450°F), green arc.

7. Transmission Oil Temperature (all transmissions):

a. Maximum -- 95°C (205°F), red radial line.
b. Normal range -- minus 10 to 95°C (50 to 205°F), green arc.
c. Cold weather -- minus 70 to minus 10°C (-90 to 140°F), yellow arc.
d. Minimum -- minus 70°C (-90°F), red radial line)

(For operating temperatures below 10°C (50°F) use oil, QPL 7808A, Spec MIL-L-7808).

8. Manifold Pressure

7    CAA-APPROVED FEBRUARY 26, 1958, V-44
Please note that the language and terminology used in this collection reflects the context and culture of the time of its creation, and may include culturally sensitive information. As an historical document, its contents may be at odds with contemporary views and terminology. The information within this collection does not reflect the views of the Smithsonian Institution, but is available in its original form to facilitate research. For questions or comments regarding sensitive content, access, and use related to this collection, please contact