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Mesa E-175 Oral Prep 2022 (just updated) > AMS > Flashcards

AMS Flashcards

1
Q

What does the AMS use bleed air for?

A
  1. ECS
  2. Engine Start
  3. Pressurization
  4. Engine and Wing A/I
  5. Water Pressure
  6. Hot Air Leak Detection
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2
Q

How many AMS controllers are installed?

A

One controller with 2 channels which control the respective onside pack

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3
Q

What happens if a single pack fails?

A

The remaining pack is able to control the entire AMS through the X-BLD valve

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4
Q

What provides air for the AMS?

A
  1. Engine Bleeds
  2. APU Bleed
  3. External Pneumatic Source
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5
Q

What is external pneumatic air used for?

A
  1. ECS on the ground
  2. Engine Start on the ground
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6
Q

Where is the external ground source panel located?

A

Lower fairing between the wings

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7
Q

What are some of the uses of APU bleed air?

A
  1. ECS on the ground
  2. Engine starting on the ground
  3. Assist with Engine Start up to FL210
  4. Bleed source up to 15000
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8
Q

Can engine bleed air flow back to the APU?

A

No, there is a check valve in place that prevents flow-back

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9
Q

Where is bleed air tapped from the engines?

A

Located at the 6th and 10th Stage Compressors with the system alternating between valves to regulate pressure and temperature

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10
Q

What is the normal bleed pressure for any engine operation?

A

roughly 45 psi

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11
Q

What is the purpose of the pre-cooler?

A

Cools the bleed air coming from the engine to the AMS (204C˚)

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12
Q

What cools the pre-cooler?

A

NACA air inlets that provide ram air to cool pre-coolers along with the Fan Air Motor Valve FAMV

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13
Q

What does the Overheat Detection System (ODS) observe?

A
  1. Engine bleeds and packs
  2. APU Bleed
  3. Plumbing for the wing and engine A/I
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14
Q

How many ECS packs are on the airplane and what provides air for these packs?

A

2 independent packs run by their respective onside engine bleeds

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15
Q

Can a single pack provide adequate temp control and pressurization?

A

Yes, up to FL310

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16
Q

What is the ratio of fresh air to recirc. air?

A

52% new 48% recirc.

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17
Q

When are the recirc. fans commanded off?

A
  1. On ground, when APU is Bleed Source
  2. Smoke is detected in Recirc. Bay
  3. Dump button pressed
  4. Both packs are commanded OFF
  5. Cargo Bay Fire Signal Present
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18
Q

What keeps the 3 avionics bays cool?

A

FWD & CTR E-Bay = 3 fans pull air from cabin to bay
AFT E-Bay = Natural air flow from cabin to bay

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19
Q

When is the emergency Ram Air Ventilation activated?

A

Left RAV (AMS controlled) = < FL250 and both packs are off
Right RAV (check valve) = Ram air pressure (outside) > cabin pressure (inside)

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20
Q

How many channels are on the Cabin Pressure Control?

A

2 Channels, one active and one standby

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21
Q

Where does the CPC get LFE?

A

FMS or manually selected

22
Q

What happens when the DUMP button is pressed?

A
  1. Both packs commanded off
  2. OFV opens (2,000 fpm up to 12,400 then natural leak)
  3. Recirc fans off
  4. RAID Doors Open
23
Q

Can the cabin altitude be higher than 12,400?

A

Yes
1. it can be done manually
2. Due to natural leak

24
Q

In manual mode, will the cabin depressurize automatically?

A

No

25
Q

What is the bleed priority in flight?

A
  1. Onside
  2. Opposite engine
  3. APU (if avail)
26
Q

If engine and apu bleed is avail, when does APU have priority?

A
  1. A/C on ground
  2. Wheel speed < 50 kts, and 30 secs have passed after touchdown
  3. ECS off AND A/I NOT ALL or single engine taxi
27
Q

When does the PPRV open?

A

∆ psi of 8.6

28
Q

What is the cabin diff pressure normally at under 37,000?

A

7.8 ∆ psi

29
Q

Can the cabin be returned back to normal operation after pressing the dump button?

A

Yes, after pressing the dump button for the 2nd time, the CPCS will return to normal operation

30
Q

Where is the AMS Controller located and how many channels does it have?

A

It is located on SPDA 2 and has 2 channels

31
Q

Which valve does the Bleed 1 (2) buttons control?

A

EBV or Engine Bleed Valve

32
Q

What type of valves are the HSV and EBV?

A

Pressure Regulating Valves as controlled per the AMS, which receive info from Pressure and Temp Sensors downstream of the EBV

33
Q

What type of valve is the 6th stage valve?

A

Check Valve

34
Q

When does the X-Bleed Valve open?

A

Whenever there is no manifold pressure on one side and there is pressure on the other side
In flight:
1. #2 start in the air
2. #1 start in the air, APU unavail.

On-ground:
Main engine start, APU unavail.

35
Q

When are the packs auto recovered?

A
  1. 500’ both engines operating
  2. 9,700’ OEI, takeoff elev. below 8,000’
  3. 15,000’ OEI takeoff elev. above 8,000’
  4. thrust levers at or below TOGA
36
Q

How many fans are a part of the ECS system?

A

9 total
6 fans for avionics cooling (3 fwd/3 aft)
2 recirc. fans
1 fwd cargo fan

37
Q

When scenarios do the FADEC send an ECS off signal to the AMS controller?

A

takeoff:
1. OEI, APU bleed unavail.
2. Thrust levers max, APU unaval
3. Ref ECS off in TDS, APU unavail
4. REF ECS off in TDS, A/I ALL

G/A
1. OEI, APU bleed unavail
2. Thrust max, APU unavail
3. Thrust max, Wing A/I requested ON

38
Q

When are both Ram Air Inlet Doors (RAID) commanded OPEN?

A
  1. In climb up to FL17.5
  2. In descent below FL17
  3. RAT Deployed
  4. A/I system is activated
  5. Dump button
39
Q

When is a single RAID door commanded OPEN?

A

Onside Pack fail or commanded off

40
Q

When are both RAID doors commanded to CLOSE?

A
  1. A/C on ground
  2. GS less than 50 kts
  3. ECS 1/2 packs detected OFF
  4. Packs 1/2 Selected OFF on OVHD Panel
  5. Dump Button NOT Activated
  6. Above 17.5 in climb and above 17 in descent
41
Q

At what temp does the Gasper SOV open?

A

at 35˚ C the Gasper SOV Opens directing Recirc Fan #2 Air directly into Gasper Manifold

42
Q

Which valve does the Pack 1 (2) buttons control?

A

FCV or flow control valve

43
Q

How long does it take for the OFV to fully actuate to 90˚ OPEN?

A

50 seconds

44
Q

What is the approximate temp of air leaving the pre-cooler?

A

Roughly 204˚ C

45
Q

What is Abort Mode and when does it activate?

A

Sets Takeoff Field Elevation, assuming returning to the field
1. A/C stops climbing
2. CRZ never activated
3. Pres. ALT below 10,000’
or
4. less than 5,000’ above Takeoff Elev.

46
Q

When does Cabin Alt Caution come on?

A

8,000’ Cabin Alt (turns yellow)

47
Q

Cabin Alt Hi Warning altitude?

A

9,700’ Cabin Alt (turns red); Aural Warning: CABIN

48
Q

When does the AMS ignore the FADEC ECS OFF Signal?

A

Above 15,000’

49
Q

What is the primary purpose for opening the Emer. Ram Air Ventilation Valve?

A

Smoke Evacuation of Flight Deck/Cabin

50
Q

What altitude must the Cabin ALT reach to auto deploy PAX Oxy and what is the ALT range?

A

Above 14,000 and between 14 and 14,750

51
Q

When does bleed manifold pressure disappear off of the Status Page?

A

When both engines are started

52
Q

5 Components of the CPCS?

A
  1. CPC (dual channel)
  2. OFV
  3. PPRV (spring-loaded check valve)
  4. NPRV (spring-loaded check valve)
  5. Static Port vented to PPRV

Mesa E-175 Oral Prep 2022 (just updated) (20 decks)

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