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B38M Tech > Air/Pneumatic Systems > Flashcards

Air/Pneumatic Systems Flashcards

1
Q

What does window heat do? (2)

A

Provides ice protection for forward windows and fog protection for all.

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2
Q

What powers window heat?

A

L1 and R2 are AC XFR BUS1, L2 and R1 are AC XFR BUS2

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3
Q

When will window heat OVERHEAT illuminate?

A

Temperature controller determine temperature too high. Current stops flowing. Reset by waiting to cool then cycling switch.

MASTER CAUTION ANTI-ICE

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4
Q

How long may ON lights stay illuminated during window heat test?

A

70 seconds

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5
Q

When will AUTO probe heat start?

A

Either engine running.

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6
Q

What heating element do the alpha vanes have?

A

Independent 115V AC

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7
Q

When must be pitot heat be on by?

A

Takeoff

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8
Q

What may happen if captains pitot fails?

A
  • May loose cabin pressurisation
  • Cabin altitude and cabin differential pressure indicator
  • Standby instruments
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9
Q

What will cause FEEL DIFF PRESS light to illuminate?

A

L or R elevator pitot blocked.

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10
Q

What does wing anti-ice heat?

A

3 onboard slats

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11
Q

Can one engine operate WAI?

A

Yes. ISOL valve to be open, or AUTO.

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12
Q

What will happen to WAI valves if loss of AC power?

A

Valves fail in position

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13
Q

Will WAI operate on the ground?

A

Yes, until thrust levers pass TO warning angle.

  • 55%N1 if below freezing
  • 40% above freezing level

Valves shut above this and WAI switch to OFF

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14
Q

What does WAI L/R VALVE light indicate? (2)

A

Over temperature situation detected. Valves close. Wait to cool.

Position of valve and switch disagreements

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15
Q

When is the WAI thermal switch bypassed?

A

Inflight, wings will not overheat with natural airflow in flight.

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16
Q

What happens to speed bar when WAI on for rest of flight?

A

Stick shaker logic and MMS bars are adjusted for icing conditions. Remain adjusted for rest of flight. (FMC VREF not adjusted)

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17
Q

Where does EAI prevent icing on airframe?

A

Cowl top and engine core

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18
Q

What bleed air does EAI use?

A

4th stage, supplemented by 10th stage. Ducted upstream of bleed valve.

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19
Q

How is the EAI valve operated?

A

Controlled by normal DC power but pneumatically operated.

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20
Q

What ignition switch is required for EAI to be on?

A

CONT

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21
Q

Where and when will amber TAI appear?

A

On engine display, when valve not in commanded position.

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22
Q

What does Amber COWL ANTI-ICE light mean

A

Pressure too high between valve and cowl tip (MASTER CAUTION).

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23
Q

When will ENG ANTI-ICE light illuminate?

A

System inhibited due to system failure or when engine core anti-ice valve fails closed (MASTER CAUTION).

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24
Q

What are the 2 EAI lights?

A
  • COWL ANTI-ICE (pressure)
  • ENG ANTI-ICE (failure)
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25
Q

What power does pressurisation modes use?

A

All modes use DC power.

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26
Q

When will the Overboard Exhaust Valve be open? (3)

A
  • on ground
  • low differential pressure
  • Inflight with either pack in high flow or R RECIRC fan OFF (smoke removal)
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27
Q

Up to what altitude can cabin altitude be maintained to sea level pressure?

A

18,500FT (maximum differential)

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28
Q

What is the maximum differential pressure?

A

9.1PSI

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29
Q

What protects from negative pressure? (2)

A
  • Negative pressure relief valves
  • Door seals
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30
Q

Does the differential pressure and cabin altitude indicator require power?

A

No electrical power required

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31
Q

When does altitude horn activate?

A

Cabin altitude passing 10,000ft.

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32
Q

What is the maximum differential pressure for TO/LDG?

A

0.125PSID

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33
Q

When is Main Outflow Valve closed?

A

When throttles advanced, controller modulates valve to close slightly pressurising cabin.

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34
Q

What does the cabin controller sense?

A

Only senses PSI.

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35
Q

When will OFF SCHED DESCENT illuminate?

A

Begin to descend before cruise altitude. Controller programmes cabin pressure to return to TO field elevation. If FLT ALT changed, TO elevation data lost.

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36
Q

When does cruise pressurisation mode activate?

A

1000ft below cruise altitude (within 0.25PSI)

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37
Q

What is the cabin differential above FL370?

A

8.35PSID.

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38
Q

What is the maximum differential pressure during isobaric cruise?

A

8.45PSID

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39
Q

When will Main Outflow Valve open on landing?

A

When N1 decreased below 50%N1. This prevents equipment cooling fan pressurising aircraft to negative pressure.

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40
Q

When will AUTO FAIL light illuminate? (6)

A
  • Loss of DC power
  • Controller fault
  • Outflow valve fault
  • Excessive differential pressure (8.75PSID)
  • Excessive rate of cabin pressure change.
  • Cabin altitude above 15800ft.
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41
Q

What will happen if AUTO FAIL light illuminates?

A

Automatic transfer to ALTN pressurisation mode. Light will extinguish with ALTN selected.

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42
Q

How does Main Outflow Valve move in manual mode?

A

Moved by separate DC motor at a slower rate than AUTO modes.

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43
Q

How long does full range of movement of outflow valve take?

A

20 seconds.

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44
Q

What happens to bleed valve if ON but no bleed air available?

A

Valve remains closed.

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45
Q

What do bleed air valves function as? (2)

A
  • Pressure regulator
  • Shut-off valve
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46
Q

When will BLEED light illuminate?

A

When bleed valve closed because of over-temperature after pre-cooler. Can also happen due to overpressure downstream of 10th stage.

Incorrect configuration after no-bleed takeoff.

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47
Q

Can BLEED trip-off be reset?

A

Yes, by TRIP RESET button.

48
Q

What is APU bleed valve powered by?

A

BATT BUS

49
Q

What can APU bleed air cause with 10th stage bleed air?

A

Back pressure 10th stage. SOV closes this.

50
Q

When will the ISOL valve open in AUTO mode?

A

If any bleed or pack switch is OFF. Allows all pneumatic users to receive air from either manifold.

51
Q

Does APU bleed position affect ISOL VALVE position?

A

No

52
Q

When will DUAL BLEED light illuminate?

A

When APU bleed valve open and possibility that engine bleed air could back pressure APU.

53
Q

Will DUAL BLEED illuminate when no engines running?

A

Yes. Only monitors position of the switches - including ISOL VALVE (not valve position).

54
Q

What are the requirements for the APU to supply bleed air? (2)

A
  • RPM over 95%
  • 1 minute delay for warmup
55
Q

Why does DUAL BLEED illuminate on engine start?

A

If ISOL VALVE in AUTO, the packs will be off so the valve will be open.

56
Q

Does APU bleed switch need to be returned to OFF before APU OFF

A

No. APU OFF signals bleed valve to close. APU then runs for 60 seconds before shutdown.

57
Q

Does DUAL BLEED illuminate on ground air or crossbleed starts?

A

No, because there’s no APU bleed air.

58
Q

Where is external compressed air supplied to?

A

Right side of pneumatic system. Start engine 2 first.

59
Q

Where is PACK HIGH prohibited? (3)

A

TO, APP & LDG

60
Q

What is the configuration for ground AC operations?

A

L pack uses APU bleed with engine 1 bleed off and ISOL VALVE closed. Engine 2 supplies R Pack. Both in HIGH.

61
Q

During no bleeds takeoff, which pack is supplied by APU?

A

L PACK

62
Q

What does WING BODY OVERHEAT mean?

A

Duct leak exists. Causes MASTER CAUTION and AIR COND to illuminate.

63
Q

What are the areas monitored for WING BODY OVERHEAT? (4)

A
  • Engine strut
  • Wing leading edge
  • AC bays for both systems
  • APU bleed air duct (Left side overhead light only)
64
Q

Is there automatic bleed shutoff for WING BODY OVERHEAT?

A

No, valves won’t automatically close.

65
Q

How is WING BODY OVERHEAT tested?

A

OVHT TEST switch

66
Q

Which PACK feeds AC to the cockpit?

A

L PACK

67
Q

What are the limits of single pack operation?

A

In HIGH flow, capable of maintaining pressurisation and temperature to surface ceiling.

68
Q

How many PACKs can the APU feed inflight?

A

1

69
Q

What happens to the pack flow when APU sole source of bleed air?

A

Switch to HIGH flow.

70
Q

Where is ground air provided too?

A

R PACK. With ISOL valve open, can feed both.

71
Q

When will a 1 pack operation revert to LOW flow from HIGH?

A

When flaps selected to maintain engine power. This does not happen if APU bleed used.

72
Q

Where does the cooling air for the packs come from?

A

RAM air system.

73
Q

When will PACK light illuminate? (2)

A

Overheat detected in one of 2 temperature sensors. Causes PACK valve to close.

Primary or standby control failure.

74
Q

What happens after turbine in PACK assembly?

A

Processed cold air and bypassed hot air are combined to get correct AC temperature.

75
Q

What operates PACK standby controls?

A

The opposite pack for redundancy.

76
Q

What happens if either PACKs primary OR standby control fails?

A

Illuminates PACK on RECALL.

If both fail, illuminates immediately.

Pack will still operate unless it trips due to overheat.

77
Q

What is the temperature of the air that leaves the packs?

A

Temperature to satisfy area that requires most cooling.

78
Q

When is RAM air inlet door fully open? (3)

A
  • on ground
  • inflight with flaps extended
  • inflight and maximum cooling required
79
Q

What are RAM air deflector doors operated by?

A

Air/ground sensor

80
Q

What determines position of RAM inlet door?

A

Compressor Discharge Temperature

81
Q

How many temperature zones are there? (3)

A

Control cabin, forward and aft cabin.

82
Q

What temperatures are the COLD, AUTO and WARM selectors?

A

Cold - 18
AUTO - 21
Warm - 30

83
Q

With TRIM AIR off, what do the packs supply?

A

L PACK supplies cockpit, R PACK controller provides average for both cabin sections.

84
Q

How many controllers control TRIM AIR?

A

Right controller for FWD cabin and cockpit, left controller for AFT cabin and backup for cockpit.

85
Q

What happens with TRIM AIR off and 1 pack operating?

A

Provides average temperature of all 3 zones.

86
Q

If all temperature selectors are off and TRIM AIR off, what temperature is supplied by packs?

A

L PACK supplies 24 degrees. R PACK supplies 18 degrees (default).

87
Q

What does ZONE TEMP illumination mean? (2)

A

Duct temperature overheat. Trim Air associated modulating valve shuts. May be reopened by TRIP RESET.

Primary or standby temperature control fails. RECALL if only one.

88
Q

What does CONT CAB illumination mean?

A

Failure of primary or standby temperature control. If both, get MASTER CAUTION.

89
Q

When will PACK light illuminate? (5)

A
  • Pack trip
  • Failure of both primary and standby pack controls
  • failure of flow control valve to open when commanded
  • incorrect pack configuration that would cause unpressurised state.
  • excessive temperatures
90
Q

What are the RECIRC fans powered by?

A

Normal AC power

91
Q

Where does each RECIRC fan draw air from?

A

L RECIRC - air distribution compartment
R RECIRC - main cabin and E&E bay

92
Q

What happens when both PACKs selected HIGH on ground to RECIRC fans?

A

Shuts down L RECIRC fan.

93
Q

What happens in air if either or all PACKs are selected HIGH to RECIRC fans?

A

L RECIRC shuts down if one in high.

If both in high, both RECIRC fans shut down. Causes overboard exhaust to open in E&E bay.

94
Q

What happens to E&E bay cooling if R RECIRC fan off?

A

Cooling maintained by automatic opening of overboard exhaust. Will only close to maintain cabin pressure.

95
Q

How many fans are in the E&E bay?

A

4 fans, 2 operate at a time. Normal and Alternate fans.

96
Q

What happens if E&E bay airflow not adequate?

A

Cooling fans OFF light illuminates, and OVHD MASTER CAUTION. Selection of ALTN causes airflow to restore.

On ground, horn sounds in nose gear well.

97
Q

What happens if smoke detected in E&E bay?

A

EQUIP SMOKE illuminates. PACKs to high, E&E supply fans off for 5 mins, then again for 5 mins if smoke still detected.

Exhaust valve opens to smoke position and RECIRCs off.

Extinguishes 30 seconds after no smoke detected.

98
Q

What side of the pneumatic system pressurises potable water?

A

L side.

99
Q

Will anti-ice/rain systems operate on BATT power?

A

No.

100
Q

What will 2 bleed lights illuminate after takeoff?

A

Incorrect configuration, 45 secs after takeoff, flaps up

101
Q

What are packs controlled by?

A

IASC, backup from other one

102
Q

Where does left pack provide air too?

A

FCC and then leftover to mix manifold.

103
Q

What does 2 PACK lights after takeoff mean?

A

Incorrect configuration, 45 seconds after flaps up

104
Q

What RECIRC will shut off inflight if one pack in high?

A

L RECIRC

105
Q

On ground, what RECIRC fan will turn off if both PACKS in high?

A

L RECIRC

106
Q

When is RAM door fully open?

A

On ground and slow flight

107
Q

What is temperature range?

A

18-30 degrees

108
Q

What IASC controls CONT CAB?

A

R IASC, which does FWD cabin. L IASC is backup and does AFT.

109
Q

How long after no smoke will EQUIP SMOKE go off?

A

30 seconds

110
Q

When does cruise mode start?

A

0.25PSI before cruise

111
Q

When does outflow valve fully open?

A

Taxi in

112
Q

Differentials at 28, 28-37 and 37000ft+?

A

28000 - 7.45PSI
28-37000 - 7.8PSI
37000+ - 8.35PSI

113
Q

When will CPC fail?

A

Cabin ROC 2000fpm, cabin altitude 15800+, differential over 8.75PSI, loss of DC Power, controller failure or outflow valve failure

114
Q

How many outflow valve motors?

A

3

115
Q

Which windows are heated?

A

All, but only 1+2 have anti-ice

116
Q

What does EAI COWL ANTI-ICE, COWL VALVE & ENGINE ANTI-ICE mean?

A

COWL ANTI-ICE - over pressure in duct
COWL VALVE - position disagreement or transit
ENG ANTI-ICE - valve failed to close

117
Q

What does WAI L/R VALVE light mean?

A

Not in commanded position

B38M Tech (5 decks)

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