7. Engines/APU Flashcards Preview

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Flashcards in 7. Engines/APU Deck (35):
1

Recall ENGINE SD symbology and color-coding

Thrust Rating

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White – Manually set modes

Magenta – FMS modes and limits

2

Recall ENGINE SD symbology and color-coding

TAT

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White – Degrees Cº

3

Recall ENGINE SD symbology and color-coding

EPR

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White T – Throttle position

Magenta V – Computed EPR thrust

**Note: When the "T" fits in the "V" the throttle is set to the computed thrust rating

4

Recall ENGINE SD symbology and color-coding

N1

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White – Normally white, however, pointer and digits will turn red if N1 exceeds limits

5

Recall ENGINE SD symbology and color-coding

TGT

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White – Normally white, however, pointer and digits will turn amber if TGT limits are exceeded for more than 5 minutes – and will turn red if redline limits are exceeded

Cyan Lightning Bolt – indicates ignition is on

Red Start Limit – displayed during ground start

6

Recall ENGINE SD symbology and color-coding

N2

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White – Normally white, however, pointer and digits will turn red if N2 exceeds limits

7

Recall ENGINE SD symbology and color-coding

Fuel Flow

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White – Digital fuel flow indication

Cyan – FUEL OFF indicates engine fuel valve is closed

8

Recall SECONDARY ENGINE SD symbology and color-coding

Oil Pressure

 

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Green Arc – Displays valid range Digits are normally white but will turn amber or red to display abnormalities

9

Recall SECONDARY ENGINE SD symbology and color-coding

Oil Temperature

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Digits are normally white but will turn amber or red to display abnormalities

10

Recall SECONDARY ENGINE SD symbology and color-coding

Oil Quantity

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Cyan Indicator– Displays initial quantity for consumption reference

Digits are normally white but will turn amber to display abnormalities

11

Recall SECONDARY ENGINE SD symbology and color-coding

Engine Vibration

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Digits are normally white but will turn amber to display abnormalities

12

Recall SECONDARY ENGINE SD symbology and color-coding

APU Information Block

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APU parameters appear when APU MASTER Switch is in RUN and remain on during shutdown as long as APU inlet doors are open

13

Recall SECONDARY ENGINE SD symbology and color-coding

% RPM Display

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Digits are normally white but will turn red to display abnormalities

14

Recall SECONDARY ENGINE SD symbology and color-coding

% EGT Display

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Digits are normally white but will turn red to display abnormalities

15

Recall the rated thrust of the BR715 engine

21,000 lbs thrust

16

Recall the engine starter duty cycle

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Three start attempts, with a maximum of 3 minutes duration each

15 seconds is required between start attempts

Allow 15 minutes of starter cooling before further start attempts are made

17

Recall the requirements for AUTO START

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**Note: During an auto-start, the EEC controls all fuel metering and ignition to the respective engine once the ENG START Switch is pulled and the FUEL Switch is elected on. The auto-start includes an automatic 30 second engine motoring delay before fuel is introduced

**Note: Auto-Start also includes a TGT protection threshold and will not allow fuel introduction unless the respective TGT is below 150Cº

IGNITION Switch – AUTO

ENG START Switch—pulled

FUEL Switch – ON

18

Recall reasons for an Auto Abort during an engine Auto Start

**Note: Auto Starts will automatically terminate and alert the crew for:

Hung Start

Starter malfunction

Hot Start (or impending hot start)

Fuel On condition not satisfied (TGT is above 150ºC)

Loss of valid N2 input

Certain failures of both channels of EEC

19

Recall all inflight starts are MANUAL starts and not EEC controlled

AUTO ABORT start protections provided by the EEC are not available

during inflight starts – ALL inflight starts are MANUAL starts

20

Recall the required engine warm up and cool down times

No minimum warm up time required following an engine shutdown of two hours or less

 A warm up of at least 3 minutes is recommended following shutdown periods exceeding two hours—HOWEVER--it is not necessary to delay takeoff if no abnormal engine indications exist

 Engines require a 3 minute cool down prior to shutdown. Verify ENGINE COOL alert message illuminated on EAD

21

Recall approximate STD day engine indications after a stabilized start

EPR -- 1.0

N1 – 20%

TGT -- 400

N2 -- 60%

FF -- 6-700

Oil Press -- 45

22

Recall the primary FADEC function and its main components

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The engines use a Full Authority Digital Engine Control (FADEC) to control engine functions from start to shutdown

 FADEC has three main components: throttle, throttle module, and Electronic Engine Control (EEC)

23

Recall when the EEC will provide automatic ignition activation (auto-relight)

**Note: The EEC incorporates an automatic re-light function that is armed from engine start to shutdown

Automatic activation of BOTH ignition systems is activated if the following conditions are detected and maintained until the conditions no longer exist:

 Combustor instability

 Significant water/ice ingestion

 Flameout

**Note: Additionally, a SINGLE ignition system unit will be automatically energized for 60 seconds after either ENG anti-ice switch has been selected on

24

Recall how to select EMERGENCY thrust

Emergency thrust is available by pushing the thrust levers through a mechanical gate

EPR will still be displayed, however, thrust management will be based on N1

 ATS will disconnect automatically and the QRH should be referenced for re-engagement

**Note: Thrust limits achieved at the forward throttle gate should be referred to as MAXIMUM power. EMERGENCY thrust = through the mechanical gate

 

25

Recall features and indications of engine reverse thrust

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**Note: The reversers will only deploy when the respective engine is running. However, when landing with an engine shut down, the reverser on the inoperative engine is permitted to deploy for 30 seconds after nose wheel compression

  • When the reversers are out of the stowed position, the reverser unlock indications (U/L) are displayed on the EAD
  • When the reversers are approximately 90% deployed, REV is displayed in green
  • Built-in safety features should prevent uncommanded reverser deployment inflight, however, should this occur, the EEC will automatically reduce thrust on the affected engine to idle – and red REV will be displayed

26

Recall how to select EMERGENCY REVERSE power

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Emergency reverse thrust is obtained by pulling the reverse thrust levers through a mechanical gate (and holding them in position)

 When selected, engine damage can occur, and a maintenance inspection will be required

**Note: Amber REV alerts will appear on the EAD

27

Recall function of the ENG EXCEEDANCE RESET Switch

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The ENG EXCEEDANCE RESET button, when depressed, resets any exceedance on the EPR, N1, TGT, and N2 primary engine synoptic displays

28

Recall the APU starter motor duty cycle

The APU starter duty cycle is limited to three consecutive start attempts

 Wait 30 minutes prior to further start attempts

29

Recall the normal and back-up fuel supply for the APU

APU fuel is normally supplied from the right main tank

Using crossfeed, fuel can be supplied from the left tank

When center tank pumps are used to supply fuel to the APU, a right main tank fuel boost pump should also be operating

When center tank fuel value is less than 800 pounds, using center tank pumps can force air into the APU fuel line and cause APU flameout or prevent APU start

30

Recall that an APU start incorporates an automatic delay

APU starts automatically delay approximately 40 seconds to allow the APU inlet door to open

31

Recall that APU bleed air is inhibited for two minutes after an APU start

APU bleed air is automatically inhibited until 2 minutes after an APU start is initiated

32

Recall how the APU shutdown cycle is verified complete

**Note: After turning the APU MASTER switch OFF ensure the APU shutdown cycle is complete by verifying the absence of the APU information block on the SD ENG display. This takes approximately 1 minute after APU RPM begins decreasing

33

Recall considerations for shutting down the APU both with and without External Power available

**Note: With no external power, the BATT switch and EMER PWR selector must remain ON until APU shutdown is complete

**Note: With external power connected, the EXT power switch or the GROUND SERVICE ELEC PWR switch must remain ON until APU shutdown is complete

34

Recall the APU continues to run for approximately 17 seconds while a No Power Break Transfer is performed

At normal shutdown, the APU continues to run for approximately 17 seconds while the electrical system performs a No Break Power Transfer (NBPT)

**Note: This delay is bypassed when the flight deck APU FIRE CONT toggle switch is moved to the OFF & AGENT ARM position OR when the exterior ground APU toggle switch is moved to the SHUT OFF position

**Note: It is also bypassed if an APU fire is detected

35

Recall the automatic shutdown features of the APU for both ground and inflight faults

On the ground when conditions are present that could damage the APU, the APU automatically shuts down and the amber APU AUTO SHUTDOWN alert is displayed

 Inflight, the APU only automatically shuts down for an APU OVERSPEED or an APU COMPARTMENT FIRE. If an APU FAULT condition occurs inflight, the APU automatically shuts down 10 minutes after landing, unless shut down sooner by the pilot