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Bell 407 > Transmission > Flashcards

Transmission Flashcards

1
Q

What type oil system is it?

A

Wet sump oil system

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2
Q

Purpose of the transmission, RPM and ratio

A

To transfer torque from main driveshaft to mast and main rotor
6,317 Engine RPM to 413 MR RPM
15.29:1 Reducing Ratio

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3
Q

What does the transmission consist of

A

Consists of a top case, support and lower case which contains:

  • input pinion: from Kaflex main drive line
  • bevel gear: reducing RPM
  • shaft arrangement sun gear
  • accessory gear drive
  • oil pump
  • oil filter housing
  • rotor RPM monopole pickup
  • magnetic chip detectors
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4
Q

Describe the mounting

A

2 pylon assemblies bolted to the aircraft roof

  • 1 degree left for translating tendency
  • 5 degreed forward for level cabin in forward flight

4 elastomeric corner mounts connect transmission to pylons
- primary vibration isolating components, for a vibration free ride through speed ranges

2 elastomeric transmission restraint spring assemblies

  • base and rear of each pylon
  • maintain proper alignment of engine to transmission main drive line
  • stop deck fittings on forward end of each restraint which limit transmission movement
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5
Q

Describe the pylon assemblies

A

2 pylon assemblies bolted to the aircraft roof

  • 1 degree left for translating tendency
  • 5 degreed forward for level cabin in forward flight
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6
Q

Describe the corner mounts

A

4 elastomeric corner mounts connect transmission to pylons

- primary vibration isolating components, for a vibration free ride through speed ranges

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7
Q

Describe the restraint springs

A

2 elastomeric transmission restraint spring assemblies

  • base and rear of each pylon
  • maintain proper alignment of engine to transmission main drive line
  • stop deck fittings on forward end of each restraint which limit transmission movement
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8
Q

Describe the chip detectors

A

3 magnetic chip detectors

  • 1 upper left side transmission
  • 1 lower left side transmission
  • 1 left side of freewheeling unit

Self locking bayonet probe with permanent magnet on end, when sufficient metal is attracted to complete circuit between pole and ground
XMSN CHIP CAS - Land as soon as possible

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9
Q

Purpose of the transmission oil system

A

Provide lubrication to transmission, mast and freewheeling unit

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10
Q

Components of the transmission oil system

A
  • pump, driven by accessory gear
  • 2 chip detectors in case, 1 in freewheeling unit
  • oil filter manifold with bypass
  • oil cooler
  • oil manifold
  • level site glass on right side
  • non-vented filler cap on right upper side
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11
Q

Capacity of the transmission case

A

5 quarts

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12
Q

Transmission oil output

A

6-6.7 gallons/minute

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13
Q

Approximate transmission oil system pressure

A

52 PSI

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14
Q

Pressure at which the transmission oil filter LRB extends

A

14 +/- 2 PSID

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15
Q

Pressure at which the transmission oil filter bypasses

A

17 PSID

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16
Q

Temperatures at which transmission oil does NOT have to be cooled

A

below 66C

17
Q

Temperatures at which oil is gradually send to the cooler

A

66-81C

18
Q

Temperatures at which ALL the oil is sent to the cooler

A

Above 81C

19
Q

XMSN OIL PRESS CAS

A

Transmission oil pressure is below minimum
Land as soon as Possible
At or below 30 PSI at idle
At or below 40 PSI in flight

20
Q

XMSN OIL TEMP CAS

A

Transmission oil temp is at or above red line
Land as soon as Practical
At or above 110C

21
Q

Describe Step-by-Step transmission oil system

A
  1. Pump scavenges oil from lower case
    - capacity: 5 quarts
    - output: 6-6.7 gal/min
    - pressure: approximately 52 PSI
  2. Oil drawn through wire screen/lower chip detector
  3. Oil directed to transmission mounted oil filter manifold
  4. Oil crosses temp bulb for oil temp indicator
  5. Oil crosses thermoswitch for the CAS
    - at or above 110C: Land as soon as Practical
  6. Oil moves to filter or bypasses
    - LRB extends 14 +/- 2PSID
    - Bypasses 17 PSID
  7. Based on oil temp …
    - No cooled if below 66C
    - Gradually cooled 66-81C
    - All cooled above 81C
  8. Passes pressure regulator
  9. Enters both sides of transmission and encounters upper chip detector
  10. Flows to oil manifold where it flows through pressure transducer and pressure switch for CAS
  11. Flows through firewall and T fitting into forward duplex bearing and aft bearing of the freewheeling unit
  12. Lubricates freewheeling sprag clutch and bearing
  13. Oil is collected in the forward freewheeling housing and passes freewheeling chip detector
  14. Oil returns to transmission lower case

Bell 407 (19 decks)

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