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CH-47D Environmental Systems

CH-47D Environmental Systems. Hot Environment. Cold Environment. Terminal Learning Objective (TLO). Action : Describe the components, operational characteristics, functions and limitations of the CH-47D Environmental Systems Conditions : In a classroom, given a student handout

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CH-47D Environmental Systems

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  1. CH-47D Environmental Systems

  2. Hot Environment

  3. Cold Environment

  4. Terminal Learning Objective (TLO) • Action: Describe the components, operational characteristics, functions and limitations of the CH-47D Environmental Systems • Conditions: In a classroom, given a student handout • Standards: Correctly answer in writing, without reference, four of five questions pertaining to components, operational characteristics, limitations, and functions of the CH-47D Environmental System, IAW TM 1-1520-240-10 and the student handout

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

  6. Learning Step/Activity #1 • Describe components, functions, and operational characteristics of the Heating and Ventilating system

  7. Heating and Ventilation System -Schematic

  8. Heating and Ventilation System • Type: • 200,000 British Thermal Unit (BTU)/hr • Internal combustion system • Fuel Supply: • R/H Main tank • Consumes 15 PPH • Electrical Power: • 3 Phase AC • 28V DC • No.2 PDP

  9. Heat Distribution − Components

  10. Cockpit Air Knobs • Located: • Outboard – Pilot/Co-Pilot • Purpose: • Regulates – Air flow to the cockpit

  11. OPERATOR’S MANUAL - CAUTION • Pull out the cockpit air knobs Slowly to preclude dirt and debris from being blasted into the air and the pilot’s eyes Page: 8−4−1

  12. Air Control Handles • Mounted: • R/H Side – Canted console • Two handles • Purpose: • Upper handle:- • Control Defogging/Defrosting • Bottom handle:- • Direct air to the cargo compartment

  13. Intake Duct Low Pressure Line Exhaust Duct Blower Main Fuel Supply Line Differential Air Pressure Switch Spark Plug Adapter Assembly Fuel Control Combustion Chamber Ignition Unit Drain Line Heater Assembly R/H side Sta.95 and 120

  14. Heater Assembly - Components • Combustor Chamber: • Inner and outer chamber • Passes air over heated chamber and discharge - Bottom • Spark Plug: • Ignition

  15. Heater Drain • Combustor Drain: Sta.98 outside R/H • Drains unburned fuel overboard • Subject to ice accumulation • If the heater shuts down during icing:- Do Not Attempt to Restart

  16. Fuel Control Main Fuel Supply Line Heater Fuel Supply Line Fuel Control Unit

  17. Fuel Control (Cont.) • Mounted: • R/H side in the heater compartment • Purpose: • Supply and control fuel flow:- • Main fuel tank – Boost pumps • Filter assembly • Fuel pump – Raises fuel pressure – 100 PSI • Pressure relief valve • Solenoid valve

  18. Exhaust System • Constructed: • Heat resistant steel • Connected– Bottom heater • Enclosed:- • Four piece shroud • Protects personnel – Exhaust surface • Outside – Helicopter (check for obstruction)

  19. Exhaust System (Cont.) Heater Exhaust REMOVE COVERS PRIOR TO STARTING THE HEATER Heater Intake

  20. Ignition Unit • Mounted: • Sta.95 R/H side • Purpose: • High voltage pulse –Spark plug • Contains: Replaceable fuse

  21. Blower Assembly • Mounted between: • Intake duct • Heater assembly • Purpose: • Draws air – Intake Blower Assembly

  22. Differential Air Pressure Switch • Mounted: • Heater compartment • Purpose: • Fuel flow • Ignition:- • Insufficient air

  23. Heater Controls (Overhead Panel) • Function Switch: • Three Position:- • VENT BLOWER ONLY • OFF • HEATER ON • Heater Start Switch: • Press and Release Type • Time Delay:- • 10 – 15 Sec • Fuel • Ignition • Cabin Temperature Selector: • Controls cabin thermostat

  24. Cabin Thermostat • Located: • L/H side Sta.355 cabin area • Function: • With temperature selector and controller • Maintain cabin temperature pre-selected temperature:- • Mercury filled – Heated 34°C • Removes power:- • Fuel solenoid valve

  25. Heater Hot CautionLight • Located: Master caution panel • Indicates: Failure automatic temperature circuits • Heater – Shuts OFF • Blower – Continue RUN

  26. Normal Operation − Starting • Inlet and outlet covers — Remove • BATT switch — ON • APU — Start (Para. 8-2-18) • APU GEN switch — ON. RECT OFF caution capsule extinguishes • R (Right) MAIN FUEL PUMP switches — ON • Heater function switch — Heater ON • HTR START switch — Press Page: 8-4-1

  27. Stopping • Heater function switch—OFF • WaitTwo Minutes Before Turning Generator (s) Off • NOTE:After heating and ventilating system has been stopped with the generator (s) ON, the blower will continue to operate until the temperature within the heater combustion chamber is below 49°Cdegrees Page: 8-4-2

  28. Heater Overheat Condition • Wait twominutes for cool down (Heater) • HTR START switch — Press • HEATER HOT caution — Monitor • The HEATER HOT caution light will not extinguish until combustion chamber temperature is below 177°Cand HTR START switch is pressed Page: 8-4-7

  29. Learning Step/Activity #2 • Describe the operational characteristics and limitations of the Windshield Wipers

  30. Windshield Wipers − Rotary Switch • Located: • Overhead control panel • Five Positions: • PARK • OFF • SLOW • MED • FAST

  31. Wipers − Park Position • Park Position: • Stowed against the inside windshield frame • Operators Caution: • To prevent windshield damage, do not operate windshield wipers when windshield is dry • NOTE: • The windshield wipers shall be off at airspeeds above 130 knots Page: 2-9-3 Page: 5-5-1

  32. Learning Step/Activity #3 • Describe the operational characteristics and limitations of the Windshields Anti-Ice

  33. Windshield Anti-Ice • Provides: • Anti-Icing/Defogging:- • Pilot and Copilot windshield • Defogging:- • Center windshield • Transparent Conductive Coating Embedded: • Pilot • Center • Co-Pilot • Electrically heated

  34. Temperature Controller • Located: • Nose compartment • Temperature Controller: • Interrupts:- • Electrical current @ 44°C degrees – Pilot and Copilot • Center windshield – 27°C degrees

  35. Operators Manual -CAUTION • If windshield bubbling or delaminating occurs around the sensor element, immediately place switch to OFF for that windshield Page: 2-9-1

  36. Windshield Anti-Ice Switches • Located: Overhead control panel • Switches: Two position • OFF • ON • CPLT – Co-Pilot • CTR – Center • PLT – Pilot

  37. Learning Step/Activity #4 • Describe the operational characteristics and limitations of the Pitot Heat system

  38. Pitot Tubes • Mounted: • L/H (No.1) and R/H (No.2) side nose • Use: • Indicate (proper) airspeed:- • Indication – Outside (ram) air • Heat system:- • Protect against ice, rain, IMC flights and water operation • Heated – 145 watt

  39. AFCS Side-Slip Ports • Mounted: • L/H and R/H side • Consist: • Upper:- • No.1 System • Lower:- • No.2 Systems • Both heated – 25 watt

  40. Pitot Switch on Overhead Panel • Switch: • Two position • OFF • ON • Use: • IMC • Icing • Rain • Water operations • Ground limitations: • 5 Min • Advise crewmember (Page: 5-9-1)

  41. Any Question?

  42. Check On Learning • What fuel Tank supplies fuel to the heater? • Right Main • When should Pitot Heat be used? • Rain, IMC, Ice and Water • What are the Five position on the windshield wiper rotary switch? • Park, Off, Slow, Medium and Fast • What Two items are the crewmembers required to check? • Pitot Heat and Yaw Sideslip Ports (AFCS) • What is the Airspeed Limit for the windshield wipers? • 130 knots

  43. Summary

  44. Think Safety!

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