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GL7500 > Environmental/bleed air > Flashcards

Environmental/bleed air Flashcards

1
Q

What are the primary functions of the Bleed Air System?

A
    1. (ECS) - Transfer bleed air from the low & high pressure ports to individual system requiring bleed air;
    1. (Pressurisation) - Control bleed air Pressure;
    1. (A/C) - Supply and control Temperature of bleed air to the Air Conditioning System;
    1. (Engine Start) - Supply bleed air for Engine Starting;
    1. (A/I) - Supply bleed air for the Wing and Cowl Anti-Ice Systems;
    1. (APS) - Supply and control Temperature and Pressure of bleed air to the APS (Air Preparation System).
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2
Q

What is both the Normal and Maximum Positive relief Differential Pressure?

A
  • Normal: 10.30 psi at FL510;
  • Maximum: 10.73 psi.
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3
Q

What is the Maximum Negative relief Differential Pressure?

A

Minus - 0.5 psi.

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4
Q

What is the Maximum Differential Pressure during Taxi & Takeoff?

A

+0.1 psi.

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5
Q

What is the Maximum Differential Pressure upon Landing?

A

+1.0 psi.

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6
Q

Above which altitude is AUX PRESS prohibited?

A

AUX PRESS prohibited above 41,000 ft.

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7
Q

How is the Landing Elevation set during QFE operations?

A
  • Must be manually set to 0 (zero);
  • Via the CTP, MIN/LDG, LDG ELEV, MAN;
  • On any MFW, MISC page, AVIONICS Tab.
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8
Q

Where is the cabin pressure and landing elevation information depicted?

A
  • Below the fuel quantities on the EICAS, or
  • On the BLEED Synoptic page.
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9
Q

Which Stages in the HPC (High Pressure Compressor) is Bleed Air extracted?

A
  • 4th Stage LP Bleed;
  • 7th Stage MP Bleed (Starting engine & Cowl anti-ice);
  • 10th Stage HP Bleed.
    Note: Wing Anti-Ice is supplied from the 4th and 10th stage (depending on demand).
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10
Q

When is the HPV (High Pressure Valve) prevented from opening?

A

When N2 is Less than 55%.

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11
Q

During ground operation, what is the priority bleed source for Engine starting?

A
  • 1st APU Bleed Air;
  • 2nd External High-Pressure ground connection;
  • 3rd Crossbleed.
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12
Q

How are Hot Bleed Air leaks monitored?

A
  • Dual Loop sensing elements (Loop A & B) are routed along the HP ducts and monitored by the IASCs
    (Integrated Air System Controller).
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13
Q

What occurs automatically when a bleed air leak is detected?

A

IASCs automatically close the bleed air valve that supplies the affected duct.

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14
Q

How is a bleed leak depicted on the BLEED Synoptic page?

A
  • Amber Flow Lines;
  • The corresponding valves are closed.
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15
Q

What happens to the PACK airflow schedule when Heating/Cooling Demand is High?

A
  • PACK FLOW HI schedule is automatically selected by the IASCs to drive maximum airflow.
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16
Q

What are the 2 functions of the Air Conditioning Packs?

A
  • Decrease the air temperature;
  • Decrease the water contained in the Hot Bleed Air.
17
Q

When do the AISCs automatically close the Flow Control Valves?

A

When a pack fails and either the DITCHING PBA is selected ON or a Pack System fault is detected.

18
Q

Which valves close when selecting the TRIM AIR PBA switch to OFF?

A
  • All 4 Trim Air Valves;
  • Both HASOV (Hot Air Shutoff Valve).
19
Q

When is Manual operation of the APU BCV (Bleed Control Valve) not possible?

A
    1. Anti-Ice is Active;
    1. LH Engine PRV (Pressure Regulating Valve) is manually opened;
    1. RH Engine PRV (Pressure Regulating Valve) & the Crossbleed Valve are manually opened.
20
Q

What are the two functions of the RAM AIR System?

A
  • Alternate source of fresh air at altitudes less than 15,000 ft.
  • Cool the packs and APS (Air Preparation System) Heat Exchangers;
21
Q

What malfunction will require the use of AUX PRESS?

A

Failure of both Packs.

22
Q

What is the Altitude Limitation for using the AUX PRESS?

A

Prohibited above 41,000 ft.

22
Q

What are the typical Cabin Altitudes for FL 510 and FL 450?

A
  • FL 510: 5,670 ft
  • FL 450: 4,500 ft
23
Q

Describe the two modes of operation with the CPCS (Cabin Pressure Control System) in AUTO:

A
  • Primary Mode (Predictive): FMS has an active flight plan with altitude, AP is on, VNAV on.
  • Secondary Mode (Reactive): Uses airplane Altimeter and Vertical Speed (ADC).
24
Q

during Loss of Pressurization, what Cabin Altitudes trigger the CABIN ALT cas message?

A
  • CABIN ALT: Caution= 8,200 ft.
  • CABIN ALT: Warning= 9,000 ft.
25
Q

How does the Cabin Altitude Warning System react to airports above 7,230 ft?

A
  • HAAO (High-Altitude Airport Operations) is triggered.
  • CABIN ALT Caution and Warning thresholds are increased progressively during TO & LDG sequences up to
    14,500 ft.
26
Q

What is required to display the LDG ELEV in magenta on the EICAS or BLEED Synoptic?

A

Active flight plan with a destination programmed in the FMS.

27
Q

How is Landing Elevation manually programmed?

A
  • From the CTP: TUNE/MENU, MIN/LDG, LDG ELEV to MAN.
  • From an MFW: MISC page, AVIONICS Tab.
28
Q

When would a pilot need to manually set the field elevation?

A
  • QFE operations (set to zero);
  • Airport Not in the database;
  • Airport Not WGS84.
29
Q

What occurs when the guarded EMER DEPRESS PBA is selected ON?

A
  • The Outflow Valves open to depressurize the cabin at a constant rate of 2,500 ft/min.
  • Cabin Altitude climbs to 14,500 ft for HAAO (or 13,800 for Non-HAAO).
30
Q

What does selecting the DITCHING PBA to ON provide?

A
    1. Both Packs OFF;
    1. OFV (Outflow Valves) Open;
    1. Once cabin is completely depressurized, both OFVs close.
  • Note: Ditching sequence is inhibited when acft above 15,000 ft).
31
Q

What is the purpose of the Safety Valves (Pressure Relief Valves)?

A
  • Ensures Overpressure and Negative Pressure Relief. When Max ΔP is reached the safety valves open to
    outside pressure independent from the IASCs.
  • Note: A Cyan SAFETY VALVE OPEN cas will appear when opened

GL7500 (16 decks)

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