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88 Cards in this Set
- Front
- Back
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Five sources for pneumatics?
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Each engine, APU, air cart & bottle.
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Which systems use pnuematics? (6)
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1. Engine start
2. Anti-ice: eng & wing 3. RAM air turbofans 4. A/C & Pressurization 5. Hyd res pressurization 6. Water tank pressurization |
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Unconditioned ground pneumatic air is supplied to which side of the manifold?
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Right side.
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Pneumatic system normally operated independently.
How divided? |
Isolation valve
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Is there a cockpit control for the ground pneu supply?
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No.
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What normally pressurizes the left system? right?
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Left: 1 eng or APU
Right: 2 Eng |
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Which system pressurizes the water tank?
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Left.
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Which bus powers the APU bleed valve?
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Battery Bus
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APU bleed air can be used for? (2)
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1. Engine start
2. Pack operation |
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DUAL BLEED light means what?
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Potential for back pressure of eng bleed air into the APU.
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When does the DUAL BLEED light come on? (2)
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1. APU bleed VALVE is open & 1 eng SWITCH is on.
2. APU bleed VALVE is open, 2 eng bleed SWITCH is on & isolation VALVE is open. |
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Thrust is limited to what when DUAL BLEED is on?
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Idle.
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What is the other time that a dual bleed condition exists, but no DUAL BLEED light comes on?
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External air supplying the left side & APU bleed valve open.
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What determines if the 2 duct pressure transmitters operate independently or in tandem?
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Isolation valve open or closed.
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Engine bleed air comes from where? (2)
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Low and High stages of the compressor.
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Normally, which stage of the compressor is adequate for supplying the air?
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Low stage.
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When does high stage bleed air kick in?
How does it come on? |
1. Throttles at idle.
2. Automatically modulates open to maintain sufficient pressure. |
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How are bleed air valves controlled and actuated?
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Electrically controlled and pneumatically actuated.
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What causes a BLEED TRIP OFF light to come on?
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Excessive temp or pressure.
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Where are the BLEED TRIP OFF sensors located?
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Pressure sensor upstream of the eng bleed valve.
Temp sensor downstream of it. |
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A BLEED TRIP OFF light causes what?
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The eng bleed valve to close.
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How do we regain bleed air after a BLEED TRIP OFF light occurs?
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Press the Trip Reset button.
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Purpose of the Precooler?
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Fan stage air to cool the bleed air before it enters the manifold.
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External air from a cart can be used for? (2)
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1. Start eng
2. Operate 1 pack |
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What is the position of the isolation valve in auto and all 4 corner switches on?
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Closed.
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What happens to the isolation valve with switch in auto and 1 or more corner switches moved to off?
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Opens.
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Which light may come on if there is a leak in a bleed duct?
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WING-BODY OVERHEAT.
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How is a WING-BODY OVERHEAT light extinguished?
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Remove the source of bleed air and let the sensor cool.
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WING-BODY OVERHEAT lights illuminate within how many seconds while the test switch is held?
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10 seconds.
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Trip Reset button resets what 3 things when cause is removed?
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1. Eng bleed trip
2. Pack trip 3. Duct overheat |
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Location of left WING-BODY OVERHEAT sensors? (5)
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1. Left eng mount fairing
2. Left wing LE 3. Left A/C bay 4. keel beam 5. Bleed duct from APU |
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Location of right WING-BODY OVERHEAT sensors? (3)
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1. Right eng mount fairing
2. Right wing LE 3. Right A/C bay |
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Four purposes of A/C system?
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1. A/C for people
2. Heats cargo compartments 3. Cools electronics 4. Pressurization |
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Air can be supplied to the air mix manifold from what sources? (3)
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Either pack and external conditioned air.
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A single pack can do what 2 things?
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1. Maintain temp
2. Pressurize the plane to <= 8000' up to FL370 |
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Three flow schedules that the pack valve modulates to?
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Normal, high & APU high.
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When do the packs provide normal flow? (2)
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1. Both packs in auto.
2. Only one pack in auto & on ground or in flight w/ flaps down. |
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When do the packs provide high flow? (3)
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1. Pack in high.
2. Only one pack in auto & in flight w/ flaps up. 3. Only one pack in auto & APU bleed valve open & both eng bleed switches off. |
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When the packs provide APU high flow?
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One pack in high, APU bleed valve open & on ground.
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What controls pack output temp?
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Air mix valves.
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Hot and cold air are combined where?
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Mixing chamber.
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20% of the left pack's air mixes with what and goes where?
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Trim air and goes to the c/p.
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How does cold air processing occur? (8)
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Primary heat exchanger/cold mix valve/ compressor/ secondary heat exchanger/ expansion turbine/ water separator/ mixing chamber/ air mix manifold
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The compressor and turbine in the pack comprise what?
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The air cycle machine.
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Where are the sensors for the PACK TRIP OFF light?
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Air cycle machine ducting.
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What happens when the PACK TRIP OFF light comes on? (2)
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1. Pack valve closes.
2. Air mix valves move to full cold. |
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How do we regain control of the pack valve after it trips off line? (2)
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1. Condition no longer exists.
2. Press TRIP RESET. |
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Four items of the Ram Air System?
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1. Deflector door
2. Ram air inlet door 3. turbofan 4. Exhaust louvers |
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Purpose of the Ram Air System?
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Provides cooling in the heat exchangers of the A/C packs.
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1. When does the ram inlet door move to the full open position? (2)
2. Which light comes on? |
1. Ground or in flight w/ flaps down.
2. RAM DOOR FULL OPEN (blue) |
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Turbofans in the ram air duct do what?
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Augment and produce airflow.
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What drives the ram air turbofans?
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1. Pneumatic air that passes through the turbofan valves.
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Ram air deflector doors do what?
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Prevent slush ingestion.
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Ram air deflector doors are controlled automatically how?
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Through the air/ground safety sensor.
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What are the 2 positions of the Air Temp source selector?
Which one is normal? |
Supply Duct, normal
Pass Cabin |
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An overheat in the air supply ducts will cause what? (4)
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1. DUCT OVERHEAT light on.
2. Air mix valve to full cold. 3. Pack valve closes. 4. PACK TRIP OFF light on. |
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How do we extinguish a DUCT OVERHEAT light?
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1. Remove the problem.
2. Press TRIP RESET. |
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How do we avoid excessive wear on the cockpit overhead fan?
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Turn the pack switches off when not in use.
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What can happen when the left pack is used and the plane has been cold soaked?
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A left DUCT OVERHEAT light is possible without a high temp indication on the Supply Duct temp gauge.
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Purpose of the Recirc Fan? (2)
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1. Reduce pack workload.
2. Reduce eng bleed air demand. |
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Recirc Fan operates how in auto? (2)
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1. On during normal ops.
2. Off when both packs operating and one or both packs in high. |
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Forward outflow valve does what when the recirc fan is off?
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Opens to ensure adequate airflow for fwd cargo heating.
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Equipment cooling has which 2 types of fans?
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Supply & Exhaust
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How are the OFF lights illuminated on the EQUIP COOLING panel?
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Temp sensors in equip cooling ducting.
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How are the Equip Cooling OFF lights extinguished?
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Turn the fan(s) to Alternate.
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What happens if insufficient airflow exists in Equip Cooling ducts on the ground with 1 or 2 IRUs operating?
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Horn in nose wheel well sounds.
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How does the pressurization system control the cabin altitude?
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By varying the position of the outflow valves.
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Which 5 areas are pressurized?
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1. c/p
2. Cabin 3. E/E comp 4. Fwd cargo 5. Aft cargo |
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Purpose of the Negative Pressure Relief Door?
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Prevents external pressure from exceeding internal pressure.
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Main Outflow Valve purpose & location?
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discharges the majority of the air.
Right rear fuselage |
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Purpose and location of the Forward Outflow Valve?
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Discharges forward main cabin and E/E air.
Left forward side of fuselage. |
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When does the forward outflow valve close?
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When the main outflow valve is almost closed or recirc fan operating.
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When does the Equipment Cooling Exhaust Valve open?
Why? |
When cabin differential pressure is low.
To assist cooling of the E/E compartment. |
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Four modes of the cabin pressure contoller?
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1. Auto
2. Stby 3. Man AC 4. Man DC |
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Which mode of the cabin pressure controller is available on standby elec power?
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Man DC
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Auto cabin pressure programs the cabin to be how many feet below field elevation?
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200'
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When does the OFF SCHED DESCENT light come on?
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When the plane initiates a descent prior to reaching the planned FL.
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How is an OFF SCHED DESCENT light extinguished? (2)
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1. Reset FLT ALT to plane's alt or lower.
2. Select STBY or MANUAL. |
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What does the FLT/GRD switch do?
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Allows the plane to depressurize by driving the main outflow valve full open.
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1. Which light comes on when the auto pressurization fails?
2. What other light comes on with it? |
1. AUTO FAIL.
2. Green STANDBY light. |
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Three reasons for the AUTO FAIL light to come on?
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1. Loss of AC power.
2. Excessive rate of cabin pressure change. 3. Cabin alt > ~14K'. |
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How would operate the cabin pressurization in STBY mode?
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According to the Additional Procedure.
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When does the green MANUAL light illuminate on the cabin pressurization panel?
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When MAN AC or MAN DC are selected.
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In MAN cabin pressurization: FLT/GRD switch does what to the way the main outflow valve is moved?
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GRD: Continuous
FLT: Increments |
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AUTO FAIL light on the cabin pressurization panel is delayed how long to avoid nuisance warnings?
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15 seconds.
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Cabin rate knob controls rate change at DECR, Index Mark, INCR
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DECR: 50 FPM
Index: 300 FPM INCR: 2000 FPM |
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1. When does the altitude horn sound?
2. Same horn as what other one? |
1. When cabin alt exceeds 10K'.
2. Takeoff warning. |
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How do you silence the ALT HORN?
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Press the CUTOUT button near the pressure panel.
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