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TH-67 Systems

TH-67 Systems. Study Guide (Power Train, Electrical, Fuel Systems, and Weight and Balance). 1. State the purpose of the power train system?. Provides drive for the tail rotor Supports the rotor head Provides a means of transmitting engine power to the main and tail rotor systems

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TH-67 Systems

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  1. TH-67 Systems Study Guide (Power Train, Electrical, Fuel Systems, and Weight and Balance)

  2. 1. State the purpose of the power train system? • Provides drive for the tail rotor • Supports the rotor head • Provides a means of transmitting engine power to the main and tail rotor systems • All of the above

  3. 2. State the purpose of the freewheeling unit/sprag clutch assembly? • It prevents main drive shaft failure by acting as a freewheeling unit when the rotor is subject to high “G”s • The sprag clutch, in the freewheeling unit, provides a disconnect from the engine enabling autorotational forces to drive the transmission, tail rotor, and all transmission mounted accessories in the event of an engine failure • The sprag clutch transfers transmission RPM (inflow of air through the rotor system) to the freewheeling unit to drive the tail rotor • B and C

  4. 3. What is the lubrication source for the freewheeling unit? • The freewheeling unit is lubricated by the engine • The freewheeling unit is lubricated by the hydraulic to oil heat exchanger behind the transmission • The freewheeling unit is a dry system thus it uses ambient air to cool down • The freewheeling unit is lubricated by transmission oil

  5. 4. Does the freewheeling unit have a chip detection capability? • No, the chip detector is not electrically wired for a “Caution Light” indication in the cockpit, thus is not consider a chip detection system • Yes, but the chip detector is not electrically wired for a “Caution Light” indication in the cockpit • There is no chip detector installed in the freewheeling unit (no gears) • Yes, the chip detector is electrically wire to the cockpit for a “Caution Light” indication to alert the pilot

  6. 5. What does the main drive shaft connect ? • It is a flexible coupling that connects the freewheeling unit to the transmission input drive • It connects the transmission to the rotor head • It connects the #5 drive shaft to the tail rotor gear box • None of the above

  7. 6. Why is the main drive shaft a flexible coupling? • Flexible is better • The engine is going to provide the transmission with different kinds of power settings, thus the need for a flexible and adaptable coupling is required • The movement between the transmission (a floating pylon mount) and the freewheeling unit mounted on the engine (a rigid mount) requires a flexible coupling • It must be flexible because of the high vibration from the tail rotor that are transmitted back to the main rotor during autorotation

  8. 7. In the event of an engine failure, what drives the tail rotor in autorotation? • The main drive shaft transfers transmission RPM (inflow of air through the rotor system) to the freewheeling unit and crosswinds provide drive to the tail rotor • The main drive shaft transfers transmission RPM (inflow of air through the rotor system) to the freewheeling unit to drive the tail rotor • The only thing that drives the tail rotor is the engine and if engine failure occurs the helicopter will enter an uncontrolled spin to the right • Autorotate when over a safe landing area

  9. 8. What mounting technique is used to secure the transmission to the airframe? • A rigid mounting technique • An isolation mounting technique (it is not rigidly mounted) • Rubber mount technique • By the drag pylon technique (spike knock)

  10. 9. What is the purpose of the pylon support links? • To mount the transmission to the airframe and bear the aircraft’s weight • To support the flight control pylon and all related equipment • To absorb negative “G”s during descents grater than 2,000 FPM • All of the above

  11. 10. What effects does a focused pylon mount have on the transmission? • It rises the CG of the transmission. This reduces the transmission’s movement • It moves the CG of the transmission 5 inches forward. This reduces the transmission’s movement • It moves the CG of the transmission 5 inches aft. This reduces the transmission’s movement • It lowers the CG of the transmission. This reduces the transmission’s movement

  12. 11. Why is the transmission mounted with a 5º forward tilt? • To provide a more desirable attitude during a hover • To provide a more comfortable attitude in forward flight • To provide a forward tilt of the main rotor to assist the pilot on forward flight at airspeeds above 100 KIAS • The tilt is 5º aft rather than forward and is to maintain a more comfortable attitude in forward flight

  13. 12. Why is the transmission mounted with a 1.25º tilt to the left? • Because of the position of the cyclic no matter if the pilot is right or left handed, it is designed for a right handed person. The tilt is built for those left handed pilot to reduced their constant cyclic input • There is no left or right tilt on the main transmission system • To help compensate for translating tendency • To help compensate for dissymmetry of lift

  14. 13. What does a rubber isolation mount provide? • It provides for lateral centering and shock absorption • It provides for longitudinal centering and shock absorption • There is no rubber on the transmission system due to high temperatures • A and B

  15. 14. What does the drag link’s round pin and the pylon stop’s square hole provide? • Centering of the transmission during installation • It provides for fore/aft/side to side movement to the desired limits • Stops high vibration frequency coming down the cabin • Positive travel limits for the pylon

  16. 15. Where does the TRANS OIL TEMP caution light get its information? • From the thermostat installed on the return line going to the oil cooler • From the switch located on the transmission oil filter’s housing • From the sump of the transmission • From a thermo bulb/transducer on the oil filter’s housing

  17. 16. Where does the transmission oil temperature gauge get its information? • From the switch located on the transmission oil filter’s housing • From the transmission oil sump • From a thermo bulb/transducer on the oil filter’s housing • From the thermal difference of the transmission oil cooler in and out lines

  18. 17. Does the transmission oil cooler have a bypass capability? • The transmission oil cooler has a thermal bypass at temperatures below 61º C. Above 81º C the bypass valve closes and the oil must be cooled. • The transmission oil cooler has a thermal bypass at temperatures below 81º C. Above 71º C the bypass valve closes and the oil must be cooled. • The transmission oil cooler has a thermal bypass at temperatures below 71º C. Above 81º C the bypass valve closes and the oil must be cooled. • The transmission oil cooler has a thermal bypass at temperatures below 61º C. Above 71º C the bypass valve closes and the oil must be cooled.

  19. 18. How is the transmission oil cooled? • There is and outer case of the transmission that is filled with water and serves as heat exchange, from there goes back to the oil cooler • A flexible duct/hose assembly transports cooling air from the engine oil cooler housing to the transmission oil cooler where some air about to cool the transmission oil is scavenged to cool the hydraulic reservoir • It is cooled by ambient air • The transmission is splash lubricated and the oil heat is dissipated as it splashes reducing the heat on the oil

  20. 19. How many chip detectors are there on the transmission oil system? • There are 2 transmission chip detectors (sump and pump) on the oil system • There are 3 transmission chip detectors (sump, pump, chip pan) on the oil system • There are 4 transmission chip detectors (sump, pump, chip pan, and freewheeling unit) on the oil system • There are 5 transmission chip detectors (sump, pump, chip pan, freewheeling unit, and the floating gear) on the oil system

  21. 20. How many chip detectors are there on the transmission that can activate the TRANS CHIP caution light? • There are 5 transmission chip detectors (sump, pump, chip pan, freewheeling unit, and the floating gear) that can activate the TRANS CHIP caution light • There are 4 transmission chip detectors (sump, pump, chip pan, and freewheeling unit) that can activate the TRANS CHIP caution light • There are 3 transmission chip detectors (sump, pump, chip pan) that can activate the TRANS CHIP caution light • There are 2 transmission chip detectors (sump and pump) that can activate the TRANS CHIP caution light

  22. 21. Where is the transmission oil level sight glass located? • The sight glass is located on the back side of the transmission • The sight glass is located on the front side of the transmission • The sight glass is located on the left side of the transmission • The sight glass is located on the right side of the transmission

  23. 22. What are the three splined areas on the mast? • The mast is splined to the planetary gear case, the floating gear, and the yoke • The mast is splined to the planetary gear case, the collar set, and the trunnion • The mast is splined to the planetary gear case and the trunnion • The mast is splined to the trunnion yoke

  24. 23. Why is the mast hallow? • It is cheaper than a solid mast • High frequency vibrations are less because the vibration travels less through the air inside the hallow mast • A hallow mast is stronger, flexible, and lighter weight • The mast is solid for maximum strength and durability

  25. 24. How many tail rotor drive shaft segments are there? • There are five tail rotor drive shaft segments. Two are made of steel, and three are aluminum alloy. • There are eight tail rotor drive shaft segments. Two are made of iron, and six are titanium alloy. • There are six tail rotor drive shaft segments. Two are made of steel, and six are aluminum alloy. • There are eight tail rotor drive shaft segments. Two are made of steel, and six are aluminum alloy.

  26. 25. How many tail rotor drive shaft segments are on top of the tail boom section of the aircraft? • Four of the eight tail rotor drive shaft segments are on top of the tail boom • Five of the eight tail rotor drive shaft segments are on top of the tail boom • Six of the eight tail rotor drive shaft segments are on top of the tail boom • Seven of the eight tail rotor drive shaft segments are on top of the tail boom

  27. 26. What are the hanger bearing assemblies used for? • Hanger-bearing assemblies are used to support the tail rotor to the tail boom • Hanger-bearing assemblies are used in Army helicopter hangar doors to assist maintainers when opening and closing the doors • Hanger-bearing assemblies are used to support the drive shaft and maintain drive train alignment in its position over the tail boom • B and C

  28. 27. What is used to connect a drive shaft segment to another component? • Disc couplings are used at every drive shaft connection to provide a strong yet flexible connection requiring no lubrication • Flexible couplings are used at every drive shaft connection to provide a strong yet flexible connection requiring no lubrication • Thompson couplings are used at every drive shaft connection to provide a strong yet flexible connection requiring no lubrication • Thomas couplings are used at every drive shaft connection to provide a strong yet flexible connection requiring no lubrication

  29. 28. Why are the indexing flats in Thomas couplings alternated? • Alternating indexing flats helps with balancing of the drive shaft • Alternating indexing flats increases the tensile strength on the flexible couplings • A and B • There are no flats on the Thomas couplings

  30. 29. What is used to prevent slipping when the last tail rotor drive shaft segment is attached to the tail rotor gearbox? • A splined adapter is used to prevent slipping • A splinedtrunnion is used to prevent slipping • A splined yoke is used to prevent slipping • The delta hinge is used to prevent slipping

  31. 30. Why are breather type filler caps used on the tail rotor gearbox? • Breather type filler caps are used to let high pressure buildup in the tail gearbox escape • Breather type filler caps are used to prevent “pooling and cavitation” • Breather type filler caps are used to provide a mean to service the tail gearbox without removing the cap, thus preventing foreign object damage (FOD) to enter the system • All of the above

  32. 31. What caution light illuminates when ferrous metal particles complete the circuit on the tail rotor gearbox chip detector? • The T/R particle caution light • The T/R complete circuit light • The T/R ship caution light • The T/R chip caution light

  33. 32. What is the rating of the SLAB battery? • The SLAB battery voltage is 21 VDC 19 amps • The SLAB battery voltage is 24 VDC 17 amps • The SLAB battery voltage is 24 VDC 15 amps • The SLAB battery voltage is 22 VDC 17 amps

  34. 33. Where is the battery switch (BATT/OFF) located? • On the lower console • On the upper panel • On the battery panel • On the overhead console

  35. 34. What recharges the battery? • The standby generator recharges the battery in flight • The N2 tachometer generator recharges the battery in flight • The N1 tachometer generator recharges the battery in flight • The generator recharges the battery in flight

  36. 35. Can the batteries level of charge be checked during flight? • No, there is no selection on the voltmeter selector switch that gives you this option • Only on the IFR version aircraft • Yes, the generator must be on as the battery switch is turned off. The drop observed on the load meter indicates how much of the generator’s load was devoted to recharging the battery • None of the above

  37. 36. What indicates a fully charged battery? • During pre-flight the SLAB dip stick should be on the full line • During pre-flight you should see acid fluid through the sight glass in front of the SLAB (top line) • A drop of less that 1% indicates a fully charge battery • A rise of 1% or more indicates a fully charge battery

  38. 37. What a drop of 1% or more on the load meter indicates? • It indicates that the battery is still charging • Indicates a fully charged battery • Indicates the thickness of the gauge • Battery life less than 30 minutes

  39. 38. What measuring gauge is used to measure 1%? • The thickness of a nickel is the measuring gauge for 1% • The thickness of a dime is the measuring gauge for 1% • The thickness of a primary line is the measuring gauge for 1% • The thickness of a secondary line is the measuring gauge for 1%

  40. 39. What does the starter component of the starter/generator do during the starting sequence? • The starter component turns the N2 gear train to drive the accessories necessary for basic engine operation • The starter component turns the N1 gear train to drive the accessories necessary for basic engine operation • The starter component turns the power turbine train to drive the accessories necessary for basic engine operation • The starter component turns the Ng gear train to drive the accessories necessary for basic engine operation

  41. 40. What does the generator component of the starter generator do after the engine is running? • The generator provides 24 VDC to the aircraft’s electrical circuits, plus it maintains charge of the main battery that is in the nose of the helicopter • The generator provides 22 VDC to the aircraft’s electrical circuits, plus it maintains charge of the main battery that is in the nose of the helicopter • The generator provides 28 VDC to the aircraft’s electrical circuits, plus it maintains charge of the main battery that is in the nose of the helicopter • The generator provides 26 VDC to the aircraft’s electrical circuits, plus it maintains charge of the main battery that is in the nose of the helicopter

  42. 41. How many buss bars are there in the VFR and A+ configuration? • There are three main buss bars in the VFR and A+ configuration • There is one main buss bar in the VFR and A+ configuration • There are two main buss bars in the VFR and A+ configuration • There are four main buss bars in the VFR and A+ configuration

  43. 42. What is the purpose of a bus bar? • A buss bar distributes electrical power • A buss bar protects circuits from over and under frequencies • A buss bar is a device which converts AC current to DC current • A buss bar connects to moving parts electrically

  44. 43. What is the starter/generator rated at? • The starter/generator is rated at 28 VAC and 105 amperes • The starter/generator is rated at 28 VDC and 150 amperes • The starter/generator is rated at 28 VDC and 105 ohms • The starter/generator is rated at 28 VDC and 105 amperes

  45. 44. What are the power sources for starting the VFR and A+ configured aircraft? • The 12 volts battery and the CPU • The battery in the nose of the aircraft and the auxiliary power unit • The starter/generator and the main battery • The main battery and standby battery

  46. 45. During normal operations, what are the power sources for the VFR and A+ configuration? • The main generator is the primary source with the standby generator as a backup power source • The battery is the primary source with the standby battery as a backup power source • The main generator is the primary source with the battery as a backup power source • The ground power unit (GPU) and the main generator

  47. 46. How long will the battery power the electrical systems after the generator has failed? • 30 minutes during the day and 10 minutes during the night • There are too many variables to predict battery life in terms of time after generator failure • With all essential electrical equipment on, about 25 minutes • With all nonessential electrical equipment off, about 45 minutes

  48. 47. How many direct current power sources are available for normal operations in the IFR configuration? • Two (main generator and standby generator) • Two (main battery and standby battery) • Three (main generator, standby generator, and the standby battery) • Three (main generator, standby generator, and the main battery)

  49. 48. What is the rating of the standby generator? • 24 VDC and 17 amperes • 28 VAC and 15 amperes • 28 VDC and 17 amperes • 28 VDC and 15 amperes

  50. 49. What is the rating of the main battery in the nose of the helicopter? • 28 VDC and 15 amperes • 24 VDC and 17 amperes • 24 VAC and 17 amperes • 28 VAC and 15 amperes

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