XII. PROPELLER LIMITATIONS

Question 1

67. What are the propeller limits?

Answer 1

1. Transients not exceeding 20 seconds — 1870 RPMS.
2. Reverse — 1650 RPMS.
3. All other conditions — 1700 RPMS.
4. Minimum idle speed 1050 RPMS.

Question 2

68. What does a sustained propeller RPM over 1700 indicate?

Answer 2

Sustained propeller overspeeds faster than 1700 rpm indicate failure of the primary governor.

Question 3

69. May flight be continued with a propeller overspeed?

Answer 3

Flight may be continued at propeller overspeeds up to 1768 rpm, provided torque is limited to 96%.

Sustained propeller overspeeds faster than 1768 rpm indicate failure of both the primary governor and the secondary governor, and such overspeeds are not approved.

Question 4

PROPELLER AUTOFEATHER

70. When should the propeller autofeather system be armed?

Answer 4

The propeller autofeather system should be operable for all flights and should be armed for takeoff; climb,
approach and landing.