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ENGINE RUNUP |
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1. | Verify area in rear is clear for runup. |
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2. | Mixture control levers - Auto-rich. |
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3. | Throttles - Set at 1200 rpm, adjust friction levers.
a. Wing flaps - check full range; return to full up. b. Ignition switches - Check ground out. c. Mixture control - Check, adjust friction levers. d. Fuel crossfeed - Check. e. Voltammeters - (1) Voltage readings - 28V +/- 0.5V. (2) Ammeter readings concide within 10%. (3) Left generator switch - OFF. Note left ammeter drops to zero and the right ammeter shows increased reading. Check that automatic change-over to standby inverter occurs and that the standby light illuminates. Left generator switch - ON. (4) Repeat (3) for right generator. f. Pitot heat - Check. g. Wing-and-tail deicing pumps - (1) Mode switch - MAN. (2) Deicing pressure 14-16 psi, suction 4-6" Hg. (3) Check operation - As desired. (4) Mode switch - OFF. h. heater intake anti-icing switches - Check. i. Temperature check - (1) Oil temperature 40C minimum. (2) Cylinder head temperature 120C minimum. |
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4. | Gust lock handle - Unlocked. |
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5. | Throttles - Set at 1900 rpm -
a. Props - Minimum decrease; rpm drops to 1300. Check 3 times on initial runup for conventional system. For reverse prop system, check on time. Adjust friction. b. Carburetor heat - Check. |
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6. | Throttles - 2200 rpm -
a. Manifold pressure - approximately field barometric pressure. b. Thrust indicators - Check for similar readings. c. Ignition system - Check magnetos, one ata time. Drop not over 100 rpm max (40 rpm differential). |
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7. | Throttles closed - Check -
a. Idling - 500 +/- 25 rpm. b. Generator warning light illuminated. c. Standby inverter light illuminated. d. Reverse prop system - (1) Carb air induction switches - Filter. (2) Throttles - Reverse idle. Check feather buttons and reverse prop indicators illuminate. (Move throttles to rear to insure freedom of movement. (3) Throttles - Normal idle. (4) Carb air induction switches - As desired. |
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8. | Propeller autofeathering system - Check: Note. If autofeather
system inoperative, perform manual check at 1900 rpm.
a. Throttles - set at 1200 rpm. b. Autofeathering switch - ON, check indicator light illuminates. c. Throttle - (1) Open right throttle until left feathering button pulls in. (Thrust pressure differential of 45 +/- 2 1/2% should be indicated). (2) Return to 1200 rpm. (3) Simultaneously pull out the button to arrest feathering cycle after 200 rpm drop. d. Autofeathering switch - OFF - then ON. e. Repeat procedure for right system. |
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9. | Autofeathering switch - OFF. |
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10. | Gust lock handle - Locked. |
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11. | Mixture control levers - Auto-lean if delay is anticipated prior to completion to takeoff check. |