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EMB-145 SYSTEMS > POWER PLANT > Flashcards

POWER PLANT Flashcards

1
Q

Oil is bypassed FCOC if?

A
  • Above 93°C fuel temp

* Above 50 psid press (psi differential between Inlet and Outlet)

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2
Q

FADEC scheduling flight idle anti-ice OFF to: (5)

A
  1. Avoid flame out
  2. Over temp
  3. Inability to accelerate
  4. Provide bleed air
  5. Accelerate to full thrust in 8 sec.
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3
Q

What is CVG?

Where?

A

Compressor variable geometry

1-5 stages of HP compressor
and inlet guide vanes

  • Engine efficiency
  • Prevents from a compressor stall
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4
Q

ITT is measured by:

A

Thermocouple

Inside the 1st stage LP
Turbine stator vane

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5
Q

What connects N2 shaft with AGB?

A

Tower shaft

if brakes, engine fails

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6
Q

What’s attached to AGB (accessory gear box)? (6)

A
  • 2 DC Generators
  • 1 FPMU (Fuel Pump Metering Unit)
  • 1 Oil Pump
  • 1 Hydraulic Pump
  • 1 PMA (Permanent Magnet Alt.)
  • 1 Air Turbine Starter
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7
Q

ATTCS select T/O–1 if: (triggering) (7)

A
  • Engine fails
  • Below 15,000’ Gear DN and Locked
  • Thrust lever above 78°
  • Pushing T/O rating button (WOW and TLA below 50°)
  • 1 TLA below 38°
  • One Engine ATTCS not armed within 2 sec
  • After arming TLA reduces below 42°
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8
Q

Abort the start IF: (8)

A

Fuel flow (F.F.) >800 lbs/hr before light-up../..
No light-up 10 sec. after F.F…/..
ITT at 6:30 on start ../..
N2 remains steady or decreases for >30 sec…/..
Unusual noise or vibration../..
Engine instruments indicate abnormal cond…/..
Fire visible on exhaust../..
Oil press below 34psi after start ../..

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9
Q

The oil pump assembly has…? Pumps

A

6

5-scavenge pumps
1-lubrication (pressure) pump

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10
Q

14th Stage Bleed open: (3)

A

Low thrust…..
Anti-icing is required…..
Cross bleed starting…..

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11
Q

FADEC will…? When N2 falls below 53% rpm

A

FADEC will terminate auto relight

FADEC will command both igniters when detects flame out

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12
Q

Purpose of FPMU (5)

A 
FPMU- is an electrical mechanical unit.
Operations directed by FADEC to control fuel for:
1. Starting
2. Operation
3. Wind milling
4. Shut down
5. CVG Operation
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13
Q

PMA (Permanent Magnet Alternator)

A 
PMA is supplying
1. Igniters (avbl at 10% N2)
2. FADEC (at 50% N2)
3. Thrust Levers
    Thrust Rating Buttons
    (Only when primary power fails)
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14
Q

The engine fuel system components: (4)

A
  • Fuel Pump Metering Unit (FPMU)
  • Fuel Cooled Oil Cooler (FCOC)
  • Compressor Variable Geometry (CVG)
  • Fuel Nozzles (16)
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15
Q

N1 Fan

How many blades?

A

24 blades

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16
Q

After aborted start

A

Dry motoring for 30 sec

Go by QRH

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17
Q

Engine lubrication system components (5)

A
  1. Oil tank
  2. FCOC
  3. Lube and scavenge pump
  4. Oil filter
  5. Air cooled oil cooler
18
Q

Thrust Lever (detent) is…?

A

78% position

19
Q

Thrust Reversers

  • Operations
  • Max Revers
  • Uncommanded Revers
A

• Operation
Hydraulically operated
- Aircraft on ground, main wheels speed > 25kts
or Aircraft all wheels on ground

•Max Revers

  • FADEC agree both engines deployed
  • inop engine idle

•Uncommanded
- FADEC will command IDLE

20
Q

X- Bleed Start (4)

A

X-Bleed — Open
Starting Eng — Bleed Close
Operating Eng — Bleed Open
Operating Eng — 80% N2

21
Q

FADEC is scheduling idle thrust

(Flight idle anti-ice ON) inhabitation

A

This automatic rescheduling of idle is inhibited below 15,000 ft Gear DN and Locked

22
Q

Fuel flow metering (on EICAS)

A

From 130 PPH to 4300 PPH

23
Q

Min Oil Quantity

A

Min 6 qts.

  • Advise mx at 8
  • Return to hub at 6
  • Don’t leave hub at 6
24
Q

FADEC will shut down the engine if (N1, N2)

A

N1 exceed 100%
N2 exceed 102.5%
N2 falls below 54% RPM

25
Q

Don’t read oil capacity for…? min after engine shutdown

A

30 min.

26
Q

Purpose of CVG

A
  1. Make engine run more efficient

2. Helps to prevent from compressor stall

27
Q

What is FADEC

A

Full Authority Digital Electronic Control

28
Q

Thrust Reversers Lock Protection

A

3 Locks

1 and 2 - electro/hydraulic
3 - electro/mechanical

29
Q

What is the Pressure Regulating Valve responsible for?

A

Supply the bearing with oil by equalizing the pressures between scavenge line center sump and pressure oil line when bearing seals are cold and let the high pressure air in (that might prevent lubrication of the bearing)

30
Q

Lubrication Pump

A

Self-regulating pump with feed back from pressure regulating valve

31
Q

Why does is show 14 qts on PFD?

A

Because of the angle of the oil tank

32
Q

AE3007A1 Thrust

A

7426 lbs of thrust at ISA+30°C

33
Q

Oil tank capacity

A

MAX- 12qts

At 5qts- warning (low level)

34
Q

FPMU Pumps:

A
  • Centrifugal pump (LP) raises fuel pressure

* Gear pump (HP) atomize fuel (mist)

35
Q

Areas of lubrication

A
  • Fan sump
  • Fwd sump
  • Center sump
  • Aft sump
  • AGB
36
Q

FADEC Discrete outputs

A

1) N2 speed switch:
• Active: above 56.4%
• Inactive: below 53%
2) ECS off signal (T/O 1 Mode) only on engine bleeds

37
Q

FPMU gear pump

provide how many PSI?

A
  • 1000 psi for CVG

* 200 psi for fuel nozzles

38
Q

Engine Start (6)

A
  1. Engine Rotation — N2
  2. Lubrication ——– Oil Press
  3. Ignition ———— N2 14% (ENG)
  4. Fuel Flow ——— N2 28% (PPH)
  5. Combustion —— ITT temp
  6. Stabilization ——
    - ——N1 (2) ITT (4) N2 (6) FF 300 pph
39
Q

What is the bypass ratio?

A

5 to 1

40
Q

What valve reduces compression for easier start?

A

Compressor acceleration bleed valve at the 9th stage

41
Q

What “ATTCS” stands for?

A

Automated Takeoff Thrust Control System

42
Q

FADEC’s share what info between engines?

A

ATTCS, Thrust reversers

EMB-145 SYSTEMS (17 decks)

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