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CH-47D Auxiliary Power Unit

CH-47D Auxiliary Power Unit. Terminal Learning Objective (TLO). Action : Describe components, operational characteristics, functions, restrictions and limitations of the CH-47D Auxiliary Power Unit (APU) Condition : In a classroom, given a student handout

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CH-47D Auxiliary Power Unit

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  1. CH-47D Auxiliary Power Unit

  2. Terminal Learning Objective (TLO) • Action: Describe components, operational characteristics, functions, restrictions and limitations of the CH-47D Auxiliary Power Unit (APU) • Condition: In a classroom, given a student handout • Standard: Correctly answer in writing, without reference, three of four questions, pertaining to Components, Operational Characteristics , Limitations, Functions, and Malfunctions of the CH-47D APU, In Accordance With (IAW) TM 1-1520-240-10 and the student handout

  3. Terminal Learning Objective (TLO) (Cont) • Safety Requirements: None • Risk Assessment: Low • Environmental Consideration: None • Evaluation: Each student will be evaluated on this block of instruction during the written examination. This will be a criterion type examination requiring a GO on each scored unit. You will have 90 minutes for the exam

  4. Learning Step/Activity (LSA) #1 1. Describe operational characteristics, of the Auxiliary Power Unit (APU) Components

  5. Model T-62T-2B Manufactured by Turbomach Consumes 90 PPH Rated Power 95 SHP Weight 74.8 W/O Generator Single stage centrifugal compressor/PT Mounted at Sta. 600 Above the ramp General Characteristics

  6. APU Mounting Points • Mounts:Two forward and two rigid links • APU to rotate down • Provide:Vertical and lateral support

  7. Motor/Pump APU Start Accumulator APU Start Module APU Generator Overhead Panel Auxiliary Power Unit APU Fuel Shutoff Valve APU Electronic Sequence Unit Master Caution Panel APU Fault Relay APU Fuel Boost Pump APU System Components Solenoid Valve

  8. APU Assembly

  9. Learning Step/Activity (LSA) #2 1. DescribePrinciples of Operational for the APU

  10. Sections of the APU Power Turbine Assembly Reduction Drive Assembly Air Inlet, andCompressor Assembly

  11. Compressor Section • Type:Single stage centrifugal-flow (impeller) • Air drawn in through the inlet

  12. Combustor Assembly • Provides: Intake of ambient air to the compress • Protects: APU against FOD ingestion

  13. Power Turbine Section • Type: Impeller turbine rotor • Secured: Aft end of the turbine assembly

  14. Reduction Gear Assembly • Purpose:Reduces power turbine shaft rotational speed • Three mounting pad

  15. APU Start Accumulator • Mounted: Sta.555 R/H Ramp Area • Purpose: Stores Hydraulic Fluid • APU Start • Emergency Use: • Utility Sub-System • Indicator: 3,000 PSI

  16. APU Start Module • Located: • Sta.584 R/H side ramp area • Directs: • Signal Pressure • APU Accumulator • Controls: • Operating Mode: • APU Motor/Pump • Indicator: • 3,000 PSI

  17. APU Motor/Pump • Mounted: • Forward Portion APU • Function: • Motor • Drives APU (Starting) • Pump • Supplies 3350 PSI • Engine Starters • Utility Sub-Systems

  18. Airframe Mounted Fuel Boost Pump • Type: Rotary vane pump • Supplies: 7−40 PSI to the APU driven fuel pump • Energized: • APU start switch RUN position

  19. Pressure Fluid Filter • Type: Paper filter element • Mounted: Top of the reduction drive assembly

  20. APU Fuel Control

  21. Fuel Manifold • Constructed:Metal fuel line • Six bosses equally spaced

  22. Start Fuel Nozzle Assembly • Mounted:Combustor housing at approx. 7 O’clock position • Purpose: Sprays fuel directly in front of the spark plug

  23. APU Electrical System • Battery Switch • Two position • APU Switch • Three position • APU GEN switch • Two position

  24. Magnetic Pickup

  25. Ignition Exciter Box • Mounted: Upper R/H side of the turbine • Purpose: Convert DC input to high energy AC

  26. Event/Time Meter • Purpose: • Tracks starts on the rotor assembly • Tracks APU operational time

  27. APU Oil System

  28. Oil Sump

  29. Oil FilterOil Pressure Switch

  30. Manual Shutoff Valve • Located: Sta.540 L/H side of ramp area • Purpose: Shut down the APU during an emergency

  31. Electronic Sequence Unit (ESU) • Located: Sta.585 L/H side • Purpose: • Sequences the start procedure of the APU • Continuously monitors the APU operation • Contains: Four BITE latches for fault indications

  32. BITE Information

  33. New Modification (ESU)

  34. Learning Step/Activity (LSA) #3 1. Describe Start Procedures, Operational Restrictions and Emergency Procedures of the APU

  35. Start Procedures

  36. Start Procedures • Three Positions Switch • Off • Run • Start • Place switch to RUN for 3-5 seconds • Move switch to START for 2 seconds and release to RUN

  37. Master Caution/Advisory Panel

  38. APU Operational Restriction

  39. Tail in the wind!!! APU Exhaust The APU shall not be started with a tail wind in excess of 25 knots

  40. APU Fire Pg: 9-1-22 Emergency Procedures • APU switch – OFF. • ABORT START.

  41. Any Question?

  42. Check On Learning • What two components are driven by the APU? • Motor/Pump and Generator • How long should you wait before attempting a restart on the APU? • 1 Minute • If the APU ON caution light fails to comes ON, what should you do? • Record the BITE information on 2408-13 • What is the maximum tailwind for starting the APU? • 25 knots

  43. Summary

  44. Have a nice dayand Safe Flying!

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