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Oral Prep 767 > Pressurisation > Flashcards

Pressurisation Flashcards

1
Q

How can the outflow valve be controlled?

A

2 Normal AC AUTO controllers
1 Manual DC Manual controller

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2
Q

What is our target cabin differential pressure?

A

8.6Psi

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3
Q

What does a cabin pressurisation above 8.6psi indicate?

A

Non normal. Cabin failing to maintain optimum

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4
Q

If the FO is managing the pressurisation controller, how would the system be configured?

A

AUTO 2

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5
Q

In Auto what are the standard rates of climb and descent for the cabin?

A

500fpm climb
300fpm descent

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6
Q

How does Boeing logic climb or descend the cabin?

A

Approximately relative to the rate of climb or descent of the cabin

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7
Q

On take off, what is the max cabin differential pressure?

A

0.125psi (approx 200 feet)

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8
Q

What happens to the outflow valve as the Thrust levers are advanced?

A

Starts to close, cabin begins descent to max of 0.125

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9
Q

Where does the cabin start to maintain 8.6psi?

A

FL350

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10
Q

At less than FL350 where would you expect to see the cabin PSI?

A

Less than 8.6

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11
Q

Above FL350 what cabin altitude would you expect to see?

A

8.6psi maintained relative to the aircraft altitude

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12
Q

Where does the pressurisation controller get inputs from?

A

Thrust levers
ADC
Landing Field Elevation
Captains Altimeter
Air/Ground Logic Main wheels

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13
Q

For a flight originating from a high altitude airport (>approx 4000’) what altitude would you see for the cabin altitude?

A

Take off airport altitude?

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14
Q

What are the 3 phases of flight that the cabin pressurisation recognises?

A

Climb
Cruise
Dsecent

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15
Q

How does the cabin transition from climb to cruise phase?

A

Level off for more than 1 minute

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16
Q

How does the cabin transition from cruise to climb?

A

Change of altitude >1000 feet

17
Q

What does the cabin pressurisation consider upon entering cruise?

A

Cabin altitude and final landing altitude comparison
Selects higher of the 2

18
Q

How does the cabin enter descent phase from cruise?

A

Descent of more than 1000 feet
Maintains 8.6 psi until FL350 then descends at Boeing logic

19
Q

With an RTO what happens to the outflow valve?

A

Automatically opens fully

20
Q

If the cabin reaches 11,000 feet what happens to the outflow valve?

A

Boeing logic uses the DC power to close the outflow valve
Uses different system to sense cabin altitude in this situation
Called Cabin Rate limiting

21
Q

What happens at 14,000 feet?

A

Deploys the oxygen masks automatically

22
Q

How long does the oxygen generation system last?

A

12 minutes

23
Q

When does the cabin altitude warning system message display on the EICAS?

A

10,000
‘Resets at 8,500

24
Q

On standby power, who controls the pressurisation?

A

Manual control

25
Q

When does the pressurisation auto INOP light come on?

A

AUTO 1 and 2 fail
Select manual, in flight, with all systems powered

26
Q

With failure of AUTO 2 what happens with Boeing logic?

A

Automatically swaps between AUTO 2 and 1, but with no indication or light

27
Q

When both auto controllers fail, where does the outflow valve go?

A

Freezes in the the position it was in when the failure occurred.
Stays in that position until manual control is established

28
Q

Placing the mode selector in Manual what happens?

A

Power removed from both AUTO controllers

29
Q

Where are the pressure relief valves located?

A

FWD of the left wing root, just above wing

30
Q

When do the Positive pressure relief valves open?

A

> 9.1psi

31
Q

The positive pressure relief valve doors open in flight, what happens to the doors?

A

They remain open. Reset by maintenance

32
Q

When do the negative pressure relief doors open?

A

Px greater inside the aircraft than outside

33
Q

How many negative pressure relief doors do we have?

A

5
2 Rear cargo doors have 2 negative pressure relief doors

34
Q

Discreet cabin altitude light comes on when?

A

> 10,000 cabin altitude
Master Warning light and aural
Extinguishes when cabin descends below 8500

35
Q

With a failure of AC power, what happens to the outflow valve?

A

Freezes in position until Manual power is established

36
Q

What has to happen for the AUTO INOP light to turn on inflight?

A

Manual Mode Select

Oral Prep 767 (37 decks)

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