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RST 1 2022 > Air conditioning/pressurisation panel > Flashcards

Air conditioning/pressurisation panel Flashcards

1
Q

AIR CONDITIONING & PRESSURISATION PANEL

DUAL BLEED light (amber)
illuminated

A

APU bleed air valve open AND
-No. 1 Engine BLEED air switch ON
or
-No. 2 Engine BLEED air switch ON + isolation valve open

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2
Q

AIR CONDITIONING & PRESSURISATION PANEL

ISOLATION VALVE switch
auto operation

A

closes valve if both engine BLEED air switches are ON and both air conditioning PACK switches are AUTO or HIGH

opens automatically if either engine BLEED air or air conditioning PACK switch OFF

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3
Q

AIR CONDITIONING & PRESSURISATION PANEL

WING-BODY OVERHEAT light (amber)
left light illuminated

A

overheat from bleed air duct leak in
-left engine strut
-left inboard wing leading edge
-left air conditioning bay
-keel beam
-APU bleed air duct

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4
Q

AIR CONDITIONING & PRESSURISATION PANEL

WING-BODY OVERHEAT light (amber)
right light illuminated

A

overheat from bleed air duct leak in
-right engine strut
-right inboard wing leading edge
-right air conditioning bay

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5
Q

AIR CONDITIONING & PRESSURISATION PANEL

Engine BLEED AIR switches
ON

A

opens engine bleed air valve WHEN ENGINE IS OPERATING

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6
Q

AIR CONDITIONING & PRESSURISATION PANEL

BLEED TRIP OFF light (amber)
illuminated

A

Excessive bleed air temp or press

related engine bleed air valve closes automatically

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7
Q

AIR CONDITIONING & PRESSURISATION PANEL

ZONE TEMP Lights (amber)
CONT CAB illuminated
FWD CAB or AFT CAB illuminated

Illuminated on recall

A

CONT CAB: duct overheat or failure of flight deck primary and sby temperature control

FWD/AFT CAB: duct overheat

on recall:
CONT CAB: failure of either flight deck primary or sby temperature control

FWD/AFT CAB: failure of associated zone temp control

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8
Q

AIR CONDITIONING & PRESSURISATION PANEL

Air Conditioning PACK Switch
AUTO operation

A

Both packs operating - both packs regulate to low flow

One pack operating - operating pack regulates to high flow in flight with flaps up

Operating one pack from APU (both engine BLEED air switches OFF) - regulates to high flow

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9
Q

AIR CONDITIONING & PRESSURISATION PANEL

Air Conditioning PACK Switch
HIGH operation

A

pack regulates to high flow

provides maximum flow rate on ground with APU BLEED air switch ON.

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10
Q

AIR CONDITIONING & PRESSURISATION PANEL

RECIRC FAN Switches
Auto operation

A

In flight-
left recirc fan operates if both packs are operating unless either PACK switch is in HIGH

right recirc fan operates if both packs are operating unless BOTH pack switches are in HIGH

On ground-
left recirc fan operates unless both PACK switches are in HIGH

right recirc fan operates even if both PACK switches are in HIGH

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11
Q

AIR CONDITIONING & PRESSURISATION PANEL

PACK Light (amber)
illuminated

A

pack trip off (due over temperature) or failure of both primary and standby pack controls

On recall:
failure of either primary or standby pack control

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12
Q

AIR CONDITIONING & PRESSURISATION PANEL

Cabin pressurisation panel
AUTO FAIL Light (amber)

A

automatic pressurisation system failure detected
single controller failure if ALTN light is also illuminated
dual controller failure if illuminated alone

Illuminates if any of the following occur:
-Loss of DC Power
-Controller fault
-Outflow valve control fault
-Excessive diff pressure (>8.75psi)
-Excessive rate of cabin pressure change (+-2000fpm)
-High cabin altitude (15,800ft)

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13
Q

AIR CONDITIONING & PRESSURISATION PANEL

Cabin pressurisation panel
ALTN light (green)

A

press system operating in alternate automatic mode

if both ALTN and AUTO FAIL lights illuminated, indicates single controller failure and automatic transfer to ALTN mode
or
press mode selector in ALTN position

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14
Q

AIR CONDITIONING & PRESSURISATION PANEL

TRIM AIR switch ON

A
  • causes both packs to be controlled by the zone with the lowest temperature setting (balanced mode)
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15
Q

AIR CONDITIONING & PRESSURISATION PANEL

CONT CAB Temperature selector position OFF

A

AIR CONDITIONING & PRESSURISATION PANEL

  • Closes cockpit trim air modulating valve
  • the packs will then be controlled to satisfy the lowest temperature demand of the two passenger cabins
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16
Q

AIR CONDITIONING & PRESSURISATION PANEL

EITHER FWD or AFT CAB temperature selectors positioned OFF

A

AIR CONDITIONING & PRESSURISATION PANEL

  • the temperature control system will not attempt to control the affected zone
  • when one is selected to OFF, both packs will be commanded to supply a temperature to the zone requiring the highest cooling demand of the CONT CAB and the active passenger CAB
17
Q

AIR CONDITIONING & PRESSURISATION PANEL

BOTH FWD & AFT CAB temperature selectors positioned OFF

A

AIR CONDITIONING & PRESSURISATION PANEL

  • both packs will be controlled to the temperature demand of the CONT CAB zone only
18
Q

AIR CONDITIONING & PRESSURISATION PANEL

All three cabin temp selectors positioned OFF

A

AIR CONDITIONING & PRESSURISATION PANEL

  • the controllers will control the left pack to maintain a fixed temperature of 24°C and the right pack to maintain a fixed temperature of 18°C
19
Q

AIR CONDITIONING & PRESSURISATION PANEL

During single pack operation with TRIM AIR selected OFF what temperature will the pack command?

A

AIR CONDITIONING & PRESSURISATION PANEL

Pack attempts to produce air temp to satisfy average temperature demands of all three zones

20
Q

AIR CONDITIONING & PRESSURISATION PANEL

If a primary pack controller fails, what happens?

A

AIR CONDITIONING & PRESSURISATION PANEL

The affected pack is controlled by the standby pack control in the opposite controller

MASTER CAUTION, AIR COND and PACK lights illuminate on recall

21
Q

AIR CONDITIONING and PRESSURISATION PANEL

When is descent mode activated during pressurisation auto mode operation?

A

AIR CONDITIONING and PRESSURISATION PANEL

When the aircraft descends below 0.25 psi below the selected FLT ALT

22
Q

AIR CONDITIONING and PRESSURISATION PANEL

Which engine stages is bleed air obtained from?

A

5th and 9th stages

23
Q

AIR CONDITIONING and PRESSURISATION PANEL

With a PACK light illuminated, the non normal checklist directs crew to select a warmer temeprature for all zones. Why?

A

To reduce workload on the affected pack

24
Q

AIR CONDITIONING and PRESSURISATION PANEL

After loss of airflow due failure of an equipment cooling fan, selecting the alternate fan will extinguish the OFF light in how many seconds?

A

5 seconds

RST 1 2022 (4 decks)

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