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DC-3 Review

DC-3 Review. Specifications,. Operations,. and. Limitations. 95 ’ 0 ”. What is the Wing Span of the DC-3?. What is the Length of the DC-3?. 64 ’ 5.5 ”. What is the Vertical Clearance of the tail in a Level Flight Attitude for the DC-3?. 23 ’ 6 ”.

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DC-3 Review

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  1. DC-3 Review Specifications, Operations, and Limitations

  2. 95’ 0” What is the Wing Span of the DC-3?

  3. What is the Length of the DC-3? 64’ 5.5”

  4. What is the Vertical Clearance of the tail in a Level Flight Attitude for the DC-3? 23’ 6”

  5. What are the Vertical Clearances for the Tail and Fuselage in a 3-Point Attitude for the DC-3? 16’ 11” 14’ 11.5”

  6. 12’ 4” What are the Vertical Clearances for the propeller on the DC-3? 11’ 6” prop diameter vertical 16”prop tip

  7. What is the Vertical Clearance for theWingtip of the DC-3? 9’ 4”

  8. 18’ 6” What is the Width of the Landing Gear for the DC-3?

  9. YES — but the reverse is not true! In a DC-3, if a wingtip has room for a turn, will the tail be clear?

  10. 25,200 lbs - Maximum Takeoff Weight What are the Maximum Takeoff and Landing Weights for the DC-3? 25,200 lbs - Maximum Landing Weight

  11. What is the VMC airspeed in the DC-3 and what is the definition of VMC ? • VMC = 76 kias • VMCis “Minimum Controllable Airspeed with the critical engine (left) inoperative”

  12. 1. Critical Engine (Left) Inoperative List all the Conditions for defining VMC on the DC-3 • 2. Inoperative Engine Propeller Windmilling • 3. Maximum Bank of 5º into the inoperative engine • 4. TAKEOFF Power applied on the operative engine • 5. Maximum Aft CG - most unfavorable condition • 6. Elevator Trim set for Takeoff • Listing continued on next slide

  13. 8. Landing Gear Retracted List all the Conditions for defining VMC on the DC-3 Listing continued from previous slide • 7. Maximum Gross Weight • 9. Flaps in the TAKEOFF Position • 10. Sea Level

  14. How does the VMC airspeed in the DC-3 change at higher elevations? • VMCwill DECREASE as elevation increases due to reduced thrust at higher altitudes

  15. What is the definition of TAKEOFF DISTANCE? • Takeoff Distance is the GREATER of: • 1. The Accelerate/Stop Distance • OR • 2. The Accelerate/Go Distance - to clear a 35’ obstacle with a failed engine at V1

  16. What is the V1 airspeed in the DC-3 and what is the definition of V1 ? • V1 = 84 kias • V1is “Decision Speed” - It is the Airspeed at which a reject action must have been initiated

  17. What is the V2 airspeed in the DC-3 and what is the definition of V2 ? • V2 = 84 kias • V2is “Takeoff Safety Airspeed” - It is the airspeed at which an engine can fail and the aircraft will continue to climb and clear all obstacles within the departure path

  18. What are the best ANGLE of ClimbSpeeds for the DC-3? • Vx - 84kias • (TWO Engine Best Angle of Climb Speed) • VXSE - 84kias • (ONE Engine Best Angle of Climb Speed)

  19. What are the best RATE of ClimbSpeeds for the DC-3? • VY - 91kias • (TWO Engine Best Rate of Climb Speed) • VYSE - 95kias • (ONE Engine Best Rate of Climb Speed)

  20. Normal Climb-115 kias What are the Normal and Single Engine Climb Speeds for the DC-3? Single Engine Climb - 95 kias

  21. What are the Landing Gear Operating Limitations on the DC-3? • VLO - 126kias • (Maximum speed for Retracting the Landing Gear) • VLE - 148kias • (Maximum speed for Landing Gear Extended) • VLO - 148kias • (Maximum speed for Extending the Landing Gear)

  22. What are the VA, VNOand VNESpeedsfor the DC-3? • VA - 120 kias(Maneuvering Speed) • VNO - 159 kias (Normal Operating Speed) • VNE - 190 kias(Never Exceed Speed)

  23. Absolute Ceiling What are the Altitude Ceiling Limitations of the DC-3? • - 26,500 ft - two engines • - 12,500 ft - one engine • Service Ceiling • - 24,800 ft - two engines • - 10,800 ft - one engine

  24. 85kias at 25,200 lbs What is the max Endurance Speed for the DC-3? 80kias at 22,000 lbs

  25. What are the Wing Flaps Operating Limitations on the DC-3? • VFE 1/4 - 135kias • (Maximum speed for 1/4 Flaps (11.5°) Extended) • VFE 1/2 & 3/4 - 99kias • (Maximum speed for 1/2 & 3/4 (20°- 35°) Flaps Extended) • VFE - 97kias • (Maximum speed for FULL Flaps (45°) Extended)

  26. What are the minimum Vref airspeedsin the DC-3? • Boundary Airspeed at Landing Weight • 80kias at 25,200 lbs • 78kias at 24,000 lbs • 76kias at 23,000 lbs • 75kias at 22,000 lbs.

  27. What are the Over The Fence ApproachSpeeds for a Normal and Short Field Landing in the DC-3? • VFOF - 84kias • (Normal ‘Over the Fence’ Speed) • VSO1.3 - 75kias • (Short Field ‘Over the Fence’ Speed)

  28. What are the REJECTED LANDINGSpeeds for the DC-3? • VGA - 94kias • (TWO Engine Go Around Speed) • VGASE - 84kias • (ONE Engine Go Around Speed)

  29. What are the STALLSpeeds for the DC-3? • VS1 - 68kias • (Stall Speed w/ gear & flaps up) • VSO - 64kias • (Stall Speed w/ gear & flaps down)

  30. What are the Maximum Demonstrated Crosswind and TailwindSpeeds for the DC-3? • VXWIND - 13kias • (Maximum Crosswind) • VTWIND - 9kias • (Maximum Tailwind)

  31. DC-3 Review ENGINE

  32. 14 Cylinders with a total displacement of 1830 cubic inches What are the specifications for the engines used on the DC-3? Pratt & Whitney 1830-92 Twin Row Radial Engine 1200 horsepower at 48” MP @ 2700 RPM

  33. 48” / 2700 rpm - Maximum power for 1 minute What are the various Power Settings for the P&W 1830 engine on the DC-3? • 42” / 2700 rpm - RTTO Reduced Thrust Takeoff • 42” / 2550 rpm - METO Maximum Except Takeoff also is Maximum Continuous Power • 36” / 2350 rpm - Climb Power • 30” / 2050 rpm - 2nd Reduction • 25” / 2050 rpm - On vectors for an approach and the downwind power setting

  34. 1. Throttles - advance both to 1700 RPM What is the Engine Run-up Procedure for the P&W 1830 engine on the DC-3? • 2. Props - Cycle both twice • 3. Prop Feather Check - Left then Right • Push feather button in • Check for Amperage draw • Check for RPM drop • Pull feather button out • 4. Props - Cycle again • 5. Throttles - reduce to 1000 RPM • Procedure continued on next slide

  35. 6. Magneto & Power - LEFT & RIGHT engines What is the Engine Run-up Procedure for the P&W 1830 engine on the DC-3? Procedure continued from previous slide • Throttle - advance to field ambient baro pressure (maximum 30” MP allowable) • Magentos - checked for 50 RPM MAX Drop • RPM’s - checked for 2300 RPM at ambient baro • 7. Throttles - return to idle

  36. Ambient Manifold Pressure At what Manifold Pressure and RPM should the power check be conducted on P&W 1830 engine on the DC-3? • 2300 RPM

  37. 100 RPM What is the Maximum Magneto Drop allowable during the engine run-up of the P&W 1830 engine on the DC-3?

  38. The LEFT Magneto fires the REAR spark plugs Which Magneto fires which Spark Plugs on the P&W 1830 engine? • The RIGHT Magneto fires the FRONT spark plugs

  39. 2050 RPM What is the Maximum RPM permitted while operating the P&W 1830 engine in ‘Auto Lean’ on the DC-3?

  40. Between 1300 - 1700 rpm What are the Engine Vibration Ranges thatmust be avoided while operating the P&W 1830 engine on the DC-3? • and • Between 1900 - 2050 rpm

  41. 1 minute on / 1 minute off What is the Starter Duty Cycle for the P&W 1830 engine on the DC-3? • 1 minute on / 5 minutes off

  42. 2. Increase Mixture to Auto Rich What actions can be taken to reduce high CHT -Cylinder Head Temperatures on P&W 1830 engine? 1. Open the Cowl Flaps 3. Increase Airspeed 4. Reduce Power

  43. 2. Off What the 5 Cowl Flap positions for theP&W 1830 engine on the DC-3? 1. Close 3. Trail 4. Off 5. Open

  44. Shuts off the OIL to the engine What does the Firewall Shutoff Value do on the DC-3? • Shuts off the HYDRAULICS to the engine

  45. Oil Pressure is below 10 psi What does a Low Oil Pressure Annunciator (orange) light indicate on the DC-3?

  46. Trapped oil in a cylinder prevents piston movement causing a hydraulic lock condition What is a Hydraulic Lock condition and how do you resolve it? • It is necessary to remove the spark plug and drain the oil from the cylinder to remove the hydraulic lock condition

  47. NOTE: 15 blades will ensure a full oiling of all the cylinders How many blades must be counted to check for a hydraulic lock condition on the DC-3? • 4 blades

  48. DC-3 Review PROP

  49. The engine RPM will go to 2050 RPM What happens if the Prop Governor Speeder Spring breaks while operating the P&W 1830 engine on the DC-3?

  50. 460 psi What Feathering System Pressure is required to operate the circuit to RELEASE the propeller feathering solenoid?

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