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Fokker 100 > Power Plant > Flashcards

Power Plant Flashcards

1
Q

How many spools are there and how are they designated

A

It is a twin spool bypass system containing HP spool and LP spool

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2
Q

What does each spool drive

A

LP spool drives N1

HP spool drives N2

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3
Q

What does the starter drive

A

The starter drives the HP shaft via the HP gear box

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4
Q

What does the combustion section consist of

A

The combustion section consist of 10 interconnected liners, each of which incorporates a fuel spray nozzle. The tube type liners are installed in a annular casing. Two igniter plugs are installed per engine.

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5
Q

How is the airflow split up as it passes the engine

A

The output from the fan is divided into two separate flows. One flow enters the LP and HP compressors to be further compressed before entering the combustion section, where fuel is added and the resultant mixture ignited. The hot gas so generated expands through both the HP and LP turbines. The other flow bypasses the engine core. The fan bypass air stream and LP turbine exhaust are mixed before discharge to the atmosphere through a propelling nozzle which incorporates a two door thrust reverser unit.

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6
Q

What could cause an engine overheat alert

A

Eng overheat alert is presented if the temperature of the cooling airflow exceeds a preset value

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7
Q

Where is the engine bleed tapped from

A

Two tappings on the HP compressor provide the bleed air, selection is automatic depending on condition and requirement.

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8
Q

How is engine oil cooled

A

By a fuel cooled oil cooler

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9
Q

How is IDG oil cooled

A

IDG oil is cooled by passing IDG oil through a primary air-cooled oil cooler located in the rear by-pass duct and a secondary fuel cooled oil cooler

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10
Q

Is the engine and IDG oil shared

A

No they are independent

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11
Q

Where is starting air derived from

A

Air​ can​ be​ supplied​ ​to the​ starter​ motor​ by​ the APU,​ a ground​ supply​ unit,​ or​ cross-bleed​ from a​ running​ engine

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12
Q

Describe an engine start

A

Air is ​admitted​ to the​ starter​ motor​ when​ the​ electrically​ operated​ starter​ valve is open.​ The​ starter​ ​valve will​ open​ when​ the​ engine​ selector is operated.​ ​ The​ starter sy​stem​ is electrically​ armed ​and​ disarmed​ via the​ START p/b.​ ​ Both fuel and​ ignition​ are applied​ when​ the​ respective FUEL ​lever​ is opened. The​ starter​ motor rotates​ the​ HP​ shaft. ​ At a​ present​ value​ of​ N2, starter​ cut-​out​ ​occurs, the​ starter​ ​valve closes.​ ​ lf​ the​ starter​ valve does​ not​ close,​ an​ alert will be​ presented.​ ​

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13
Q

When should light up occur in starting

A

Once the starter is selected on and N2 has stabilised, and the fuel lever is set to open within 10 seconds light up should occur.

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14
Q

What are the starter limits during start Max TGT 740 for 2 secs
Light up within 10 seconds. Total time from starter on to light up within 2 mins

A
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15
Q

What can you do if a starter valve doesn’t open

A

lf​ the​ starter​ valve​ does​ not open​ electrically;​ the​ ​valve ​can​ be opened​ manually

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16
Q

What igniter plugs are active and when with the ignition selector in:
CONT 1, CONT 2, AUTO , RELIGHT.

A

Each​ engine​ has​ two ignition​ systems installed,​ system​ 1​ and​ system​ 2, to​ operate the​ respective ​igniter​ plug.​ ​​ ​One​ IGNITION selector​ provides​ the​ selection​ for both engines​ of​ system​ 1,​ system​ 2, or​ both ​systems simultaneously​ via the​ CONT​ 1,​ NORM,​ CONT​ 2 or​ RE-LIGHT position​ of​ the​ selector

In the​ RELIGHT​ position​ of​ the​ ignition​ selector, both ignition​ system​ 1 and​ 2​ are activated ​irrespective of​ START​ p/b and​ FUEL lever​ positions

17
Q

How is ice prevented from forming in the engine fuel system

A

Hot oil and oil and fuel heat exchanger

18
Q

What lever controls the HP fuel valve and what are its positions

A

The fuel flow regulator is controlled by the thrust lever, which can be operated manually or automatically by the Auto throttle system

19
Q

By what means may the thrust levers be operated

A

Manually or automatically by the Auto throttle system

20
Q

What effect has the flight control lock on the thrust lever movement

A

When the flight control lock is on the forward thrust lever movement is limited approx 80% of N2

21
Q

What happens to IDLE RPM on approach

A

To​ ensure​ fast​ engine​ acceleration​ from​ idle​ to​ TOGA​ thrust​ is​ case​ of​ a​ go- ​around,​ idle​ N2​ is​ increased​ automatically​ to​ approx​ 70​ per​ cent​ N2​ ​when ​the​​ gear​ is​ down.​ Approach​ idle​ is​ cancelled​ approx​ 5 seconds​ after ​touchdown.​

22
Q

What thrust ratings may be selected on the TRP

A

TOGA and FLEX, climb ,crz

23
Q

How do you set an assumed temperature for FLX

A

When​ scheduling​ flexible thrust select FLEX​ at the TRP​ and​ check​ that the​ ​EPR​ target at MFDS is​ equal​ to​ the EPR​ value for​ the assumed​ temperature​ ​obtained from​ the take-off​ limit table​ or​ the Quick​ Reference Handbook.​ ​

24
Q

What do you need to do to set EPR Manually

A

Both AFCS Channels failed to both Auto throttle switches pressed manually the EPR can be set manually by means of MAN EPR Selector at the TRP

25
Q

How are thrust reversers actuated

A

Hydraulically by System 1

26
Q

How do you know reversers are operating

A

When deployed a green R displayed at the top of the EPR tape

27
Q

Can thrust reversers be used before touchdown

A

No, only deployed on ground

28
Q

What happens if a reverser deploys inadvertently

A

Corresponding thrust lever snaps back to idle

29
Q

Where are engine indications normally presented

A

Primary page MCDU

30
Q

What parameters does the EFSU look at

A

A dual​ channel engine failure sensing unit​ (EFSU)​ is installed to detect​ an engine failure. The​ ​EFSU receives​ inputs of​ N1 and thrust​ level position from both​ engines.​ The EFSU provides for​ ​the rapid detection of​ large​ thrust​ loss of​ one​ engine during take-off, climb,​ or​ cruise when both​ ​thrust​ levers are positioned to​ above MIN TO. The EFSU​ provides an engine failure signal to​ ​AFCAS, FWC,​ the​ air​ conditioning​ system​ and​ the engine ignition system

31
Q

What is SEI and where can it be used

A

The​ ​primary​ engine parameters can​ also be​ read​ from​ the Standby​ Engine Indicator (SEI). The SEI​ is​ ​connected directly​ to​ the​ engines and​ can​ be switched on/off​ any​ time.​

32
Q

How is vibration indicated

A

Vibration​ (VIB)​ is​ represented​ by​ two green​ tapes​ for​ each​ engine.​ ​ Each​ tape​ represents​ an ​engine​ spool​ and​ indicates​ the​ actual value​ above​ or​ below​ a threshold​ mark. ​ A​ VIB p/b at the ​ENGINE panel allows the pilot​ to verify​ high vibration​ levels by​ selecting​ alternate sensors. ​

33
Q

What does the normal and alternate vibration sensors monitor

A

Verify high vibration levels in both spool

Fokker 100 (18 decks)

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