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PIQ Sim Check 2019 > Engine System > Flashcards

Engine System Flashcards

1
Q

recommended supply pressure for engine start

A

APU-20 psi
crossbleed- 25 psi
external air- 30 psi

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2
Q

stop start if you don’t have ___ psi of supply pressure after start button pressed

A

15 psi

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3
Q

What does the “J” technique cover to prep for engine start?

A

generator
bleed air
aux pump
boost pumps

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4
Q

When to use each ignition for engine start?

A

A-odd days
B-even days
A&B-icing present/anti-ice required or turbulence is encountered or expected

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5
Q

N2 indication within ___ secs of start button in/on

A

20 sec

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6
Q

turn ENG Shutoff switch on when-

A

min. 18% N2 (20% is normal ops)

oil press > 5 psi

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7
Q

why do we delay until 20% N2 to turn on ENG shutoff switch?

A

it results in faster and cooler starts

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8
Q

normal FF?

A

400-500 pph

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9
Q

stop start if FF > ___ pph

A

700 pph

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10
Q

EGT rise (light off) within ___ sec of fuel on

A

20 sec

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11
Q

N1 RPM indication should display prior to reaching ___ % N2 RPM

A

40%- OAT above 0 deg C

30%-OAT 0 deg C or less

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12
Q

starter cutout at ___% N2

A

51%

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13
Q

manually pull out the ENGINE START button if ti fails to release by ___

A

55% N2

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14
Q

light may take up to ___ sec to extinguish after start button pops out

A

30 sec

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15
Q

minimum engine idle values

A

degrees Celsius-> %N2:

-40 54
-20 56
0 58
15 60
30 62
45 64

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16
Q

ENGINE START button doesn’t engage (push start button in and it doesn’t stay in)–

A

verify/change ignition source

if it still doesn’t stay in, may be held in for start

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17
Q

air conditioning pack disagree during engine start–

A

momentary may occur
if it’s continuous PACK DISAG=pack has not shut down
deselect that pack manually prior to 18% N2
if past 18% N2-STOP START

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18
Q

button pops out at 51% N2, but light stays on. How long can it stay on?

A

up to 30 sec after button pops out
after that-STOP START
isolate all air sources to the engine before “Engine Clearing Procedure”

19
Q

starter attempt limits

A

2 consecutive starts with no wait period
then wait 15 min until 3rd attempt
10 minute wait between subsequent attempts
max of 5 attempts in one hour, followed by 1 hour cooling period

memory aid: 2-15-10-5-1

20
Q

restart limitations

A

engine rotation completely stopped before starter re-engaged (exception when starter engaged in an emergency below 20% N2)
wait 40 sec after N2 disappears from the MFD to ensure rotation stopped
motor engine to get EGT below 190 deg C before introducing fuel
(time, EGT, N2 disappearing)

21
Q

STOP START/engine clearing procedure

A

announce “STOP START”

if button still engaged:
ENG Shutoff Switch-> OFF
motor for 30 sec
pull start button out

button popped out:
ENG Shutoff Switch->OFF
allow N2 to wind down below 20%, preferably 40 sec wait to complete stop (except in an emergency)
engage engine start button 
motor for 30 sec
pull start button out
22
Q

max time engine can be motored

A

15 mins

23
Q

for motoring duration greater than 90 seconds up to and including 15 minutes, cool the starter for-

A

5 mins for each 30 seconds of operation up to a maximum of 40 mins

24
Q

hot start reasons

A

hung start that is allowed to progress
failure to cool an engine below 190 deg C
excessively high FF ~700 pph when fuel switch (ENG shutoff switch) turned on
rapidly climbing EGT that’s NOT parallel to N2

25
Q

when deg C should you stop a hot start before?

A

495 deg C

annotate peak EGT above 495 deg C and duration above

26
Q

hung start reasons

A

occurs when an engine is not able to reach idle

27
Q

indications of a hung start

A

no perceptible N2 movement towards idle or N2 rolling back
continued EGT rise above normal start values
if allowed to continue-hot start may result

28
Q

will engine respond to throttle movement in a hung start?

A

no

29
Q

how to deal with a hung start?

A

STOP START

engine clearing procedure

30
Q

sub-idle hung start indications

A

typically after start cut out when OAT > 20 deg C
very slow N2 acceleration between 56-60% N and continuous EGT rise
EGT will eventually exceed limits

31
Q

when would you suspect sub-idle hung start?

A

lesser RPM compared to other engines

or if engine hasn’t reached RPM for the OAT

32
Q

max EGT for start

A

495 deg C

33
Q

stable N2

A

green, not in sub-idle, see table

34
Q

stable EGT

A

less than 460 deg C (bleeds off) 490 deg C (bleeds on)

35
Q

stable oil pressure

A

70 psi minimum

36
Q

stable fuel flow

A

800-1200 pph

37
Q

APU- how long between start attempts?

A

starter may be run for 1 min with 5 mins between attempts

38
Q

APU-how many attempts in an hour?

A

3 starts attempted per rolling one hour cycle
min of 5 mins between attempts
(APU: 1,5,3)

39
Q

APU starter operating limit/what is considered a start attempt?

A

1 min

any APU starter engagement

40
Q

What does the APU override not work for?

A

fire and overspeed protection

41
Q

Why do we have an APU?

A

to provide electrical power, air conditioning, and air for engine start

42
Q

What CB do you always check prior to APU start and why?

A

FIREX AGENT DISCHARGE 1 POWER CB (OVHD E13) because the APU Fire Agent DISCH switch will be inpoerative if it is open (DO NOT RESET CB)

43
Q

What needs to be retracted prior to/immediately after APU start?

A

slats, to prevent damage to slat seals

44
Q

After turning off APU bleed air, how long do you wait before turning off the APU?

A

minimum of 2 minutes

PIQ Sim Check 2019 (8 decks)

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