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HAC/2P > Eng Oil system > Flashcards

Eng Oil system Flashcards

1
Q

NATOPS Chap 2

Engine Oil System

The Eng Oil System Is….

A

“A self-contained, pressurized, recirculating dry-sump system.”

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2
Q

NATOPS Chap 2

Engine Oil System

Components of the Oil System:

A
  1. Oil tank
  2. Oil supply and scavenge system
  3. Oil filter and condition monitoring system
  4. Air/oil cooler (Scroll Vanes)
  5. Fuel/oil cooler
  6. Chip detector
  7. Px and Temp indicators.
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3
Q

NATOPS Chap 2

Engine Oil System

How does the oil flow?

A

Picked up by suction created from the pressure element of the pump. Once pressurized, it flows through the filter and into the AGB and six sump bearings.

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4
Q

NATOPS Chap 2

Engine Oil System

How many oil jets are in each bearing? And what do they do?

A

There are two oil jets per bearing and they provide each main bearing with oil for lubrication and cooling. This redundancy provides for a brief period of operation following a malfunction or damage that totally interrupts the normal supply of oil.

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5
Q

NATOPS Chap 2

Engine Oil System

What is the temp for the impending bypass PDI?

A

It has a thermal lockout below 38* to prevent the indicator from popping during cold weather ops.

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6
Q

NATOPS Chap 2

Engine Oil System

3 ways to anti ice the engine

A
  1. Vent Bleed air into the eng swirl vanes and Eng Inlet Guide Vanes by the eng anti-ice/start bleed valve
  2. Vent bleed air into the airframe eng inlet by eng inlet anti-ice valve
  3. Continuously pump eng oil thru the scroll vanes
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7
Q

NATOPS Chap 2

Engine Oil System

When does the Anti Ice valve remain open?

A

below approx 90% Ng to prevent compressor instability during starts.

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8
Q

NATOPS Chap 2

Engine Oil System

What can cause engine flameouts?

A

The hangup of the engine Variable Geometry system at the anti-ice start bleed valve at low collective settings.

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9
Q

NATOPS Chap 2

Engine Oil System

What will the HMU do when the collective is full down?

A

Schedule max fuel flow to the VG actuator creating a diversion from the scheduled fuel flow to the eng to prevent a temporary hangup position.

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10
Q

NATOPS Chap 2

Engine Oil System

Indications of a Malfx anti-ice/start bleed valve:

A
  1. Illum of ENG Anti Ice on with Ng>90 or >94 Ng if OAT is 15* or higher
  2. No Illum of On advisory when Ng drops below ~88%Ng (may vary on a sliding scale)
  3. No illum of On advisory light when Anti Ice switch is selected on
  4. No rise in TGT when switch is selected on (With Anti Ice on, torque is reduced up to 18%)
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11
Q

NATOPS Chap 2

Engine Oil System

The inlet anti ice valve is….

A

“a solenoid activated, modulating valve located in the engine inlet cowling”

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12
Q

NATOPS Chap 2

Engine Oil System

The bellows operate:

A
  1. <4, the valve is open and the INLET On advisories appear when Inlet temp reaches 93
  2. Between 4* and 13* the valve is controlled by a temperature-compensating Freon-Filled bellows. The bellows begin closing the valve when OAT reaches 4* and should be completely closed by 13*
  3. Above 13, the valve is closed and the advisories will extinguish when inlet cowling temperature drops below 93
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13
Q

NATOPS Chap 2

Engine Oil System

Warning about Inlet Anti ice and temp >13

A

Illum of advisory when OAT> 13 is an indication of a faulty engine inlet anti-ice modulating valve. The resultant of loss of power could be a max of 49% torque

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14
Q

NATOPS Chap 2

Engine Oil System

What is the primary means of cooling hot Eng Oil

A

Engine Scroll Vanes

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15
Q

NATOPS Chap 2

Engine Oil System

TGT Sensing

A

The TGT signal is biased -71*C by the DECU then relayed to the TGT Vertical instruments from the DECU

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16
Q

NATOPS Chap 2

Engine Oil System

How does the Scavenge Oil flow through the system?

A

Scavenge oil flows through the pump inlet, electrical chip detector, fuel/oil cooler, the main frame, scroll vanes, and into the oil tank.

17
Q

NATOPS Chap 2

Engine Oil System

Where does the oil flow after passing through the oil cooler?

A

It enters the top of the main frame, where it flows through the scroll vanes that funciton as an air/oil cooler. This further cools the oil and heats the vanes for full-time anti-icing

18
Q

NATOPS Chap 2

Engine Oil System

How is hot air flow distributed through the system?
How do the valves operate?

A

Hot air flow for anti-icing is distributed through two solenoid-operated air valves. Both valves are held closed electrically and controlled by the ENG ANTI-ICE and DEICE MASTER switches on the upper console.

19
Q

NATOPS Chap 2

Engine Oil System

What is the thermal switch, and how does it operate?

A

The inlet thermal switch, mounted inside the engine inlet cowling, senses the air temperature inside the cowling. The #1/#2 INLET ANTI-ICE ON advisory will illuminate when the bleed air heats the engine inlet to approximately 93* C. The inlet thermal switch does not have any input into or control over the inlet anti-ice valve or the Freon bellows.

20
Q

NATOPS Chap 2

Engine Oil System/Engine Parameter Sensing

Where and how is Np sensed?

A

Two Np sensors are located on the top of the exhaust frame. The power turbine shaft is equipped with two pairs of teeth, which induce electrical pulses in the Np sensors. These teeth permit mearsurement of the torsion or twist of the shaft, which is proportional to output torque, by producing a pulse of electrical current each time a shaft or reference tooth passes.

21
Q

NATOPS Chap 2

Engine Oil System/Engine Parameter Sensing

What does each Np sensor measure?

A

The Left sensor–> Np signal to the DECU and cockpit Vertical Instruments

The Right Sensor–> feeds the torque computation
circuit and the Np overspeed protection system

22
Q

NATOPS Chap 2

Engine Oil System/Engine Parameter Sensing

How is Ng sensed?

A

The alternator supplies an Ng signal to the VIDS in the cockpit

HAC/2P (27 decks)

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