15. Propeller overspeed governors

TM-55-1510-222-MTF Army RC-12K Aircraft Manual
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TM 55-1510-222-MTF PROCEDURE TROUBLESHOOTING REFERENCE h. Repeat step g by retarding right power lever. with left power le- ver above 89% N₁. *15. Propeller overspeed governors - Check as follows: F1-3 a. Propeller levers - HIGH RPM. b. Propeller governor test switch - Hold in TEST position. c. Left engine power lever - Ad- vance until overspeed governor governs propeller (1540 to 1580 RPM). Observe tempera- ture and torque limits. d. Left propeller governor test switch - Release. Propeller RPM should increase. e. Left engine power lever - IDLE. f. Repeat steps b through e for right engine. *16. Autoignition system - Check as fol- lows: a. Power levers - Set above 25% torque. b. Autoignition switches (2) - ARM. c. Power levers - Retard. d. Ignition annunciator lights - il- luminated (14 to 20% torque). *17. Primary governors - Check as fol- lows: F1-3 a. Power levers - Set 1500 RPM. 2-37

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