Engine Oil, Start, Parameter sensing Flashcards

1
Q

The engine oil system is

A

Self-contained, pressurized, recirculating dry sump system

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2
Q

A malfunctioning starter may be overridden by _____________

A

Manually holding in the starter until NG reaches 52 to 65% NG

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3
Q

Two ways to get pneumatic power for engine starts

A

APU

Engine crossbleed

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4
Q

What are the 3 ways to anti-ice the engine?

A

1) vent bleed air into the engine swirl vanes and inlet guide vanes by the ENG ANTI-ICE/START BLEED VALVE.
2) vent bleed air into the airframe engine inlet by the ENGINE INLET ANTI - ICE VALVE
3) Continuously pump engine oil through the SCROLL VANES

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5
Q

ENGINE ANTI-ICE/START BLEED VALVE uses what type of air?

A

5th stage bleed air

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6
Q

ENGINE ANTI ICE START BLEED VALVE malfunction is indicated by:

A
  • illumination of light w/ greater than 90 % NG or 94 if greater that 15 C OAT
  • NO illumination if NG drops below 88%
  • NO illumination when the switch is ON.
  • NO rise in TGT when switch is on.
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7
Q

With Eng anti ice on max TQ is reduced by

A

18%

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8
Q

INLET ANTI-ICE operates as follows:

A

Less than 4 OAT, the valve is open and the advisory comes on when inlet temp hits 93 C.

Between 4 and 13 OAT, The valve is controlled buy by a Freon Bellows begins closing at 4° and is completely closed at 13.

Above 13 OAT the valve is closed.

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9
Q

The two NP sensors send information to?

A
  • The left sensor provides an Np signal to the DECU and the VIDS
  • The right sensor feeds the torque computation circuit and the Np overspeed protection system
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10
Q

NG is sensed by?

A

The alternator sending a signal to the vertical instruments

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11
Q

TGT sensing

A

Thermocouple harness of 7 thermo couples that are averaged together and sent to the vertical instruments.

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12
Q

If DECU is not powered by either the ALTERNATOR or the backup 400 hz through ENG OVSP circuit the DECU will_______.

A

Indicate 71° higher than expected

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13
Q

How many main sump bearings are there in the Oil system?

A

6

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14
Q

How does the engine provide redundancy if a malfunction or damage totally interrupts the normal supply of oil?

A

The engine has 2 sets of oil jets to provide each main bearing with oil

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15
Q

What causes the #1/#2 OIL FLTR BYPASS caution to illuminate?

A

The oil filter bypass sensor switch

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16
Q

When does the thermal lockout for the oil PDI work?

What is it for?

A

below 38 C

to prevent the pdi from popping during cold-weather starts

17
Q

How is oil cooled?

A

The fuel/oil cooler and the air/oil cooler (Scroll vanes)

18
Q

Does the Engine Chip Detector have a burnoff feature?

A

no

19
Q

What does the APU provide during engine start?

A

bleed air and electrical power

20
Q

What position does the AIR SOURCE ECS/START switch need to be in for the APU to provide pneumatic power?

A

Doesn’t matter, APU will provide pneumatic power regardless of the switch position

21
Q

For a crossbleed start, what must Ng be for the receiving engine?

What does this require the donor engine Ng to be?

A

Shall be a minimum of 24%

90-94%

22
Q

With a faulty engine inlet anti-ice modulating valve, you could lose ___ power.

A

49%

23
Q

When DE-ICE MASTER switch is on, and Ice is detected, what turns on?

A
  • ENG ANTI-ICE
  • WINDSHIELD ANTI-ICE
  • BLADE DEICE POWER
24
Q

How is Np sensed?

A

The power turbine has 2 sets of teeth that induce electrical pulses in the Np sensors. These teeth permit measurement of the torsion or twist of the shaft which is proportional to torque output