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Delta MD-88 eSV > Air Systems, Anti-Ice and Rain > Flashcards

Air Systems, Anti-Ice and Rain Flashcards

1
Q

AIR_001

Explain the function of the CKPT/CABIN TEMP Selector Switches:

A
  • AUTO - Temperature automatically adjusts toward HOT or COLD when selector is moved left or right of index mark.
  • MANUAL (COLD/STOP/HOT) - Spring loaded to stop.
  • Momentarily moving selector to HOT or COLD opens or closes temp. control valve.
  • Displayed on L/R VALVE TEMP CONTROL indicator.
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2
Q

AIR_002

Explain the meaning of the blue AUTO 1 INOP and AUTO 2 INOP lights on the pressurization panel:

A

INOP (2) (blue) - Illuminates when that system fails. Stby system automatically controls pressurization.

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3
Q

AIR_003

Meaning of amber AUTO INOP light on pressurization panel:

A

AUTO INOP (amber) - Illuminates when both automatic systems failed. Pressurization is manually monitored and controlled.

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4
Q

AIR_004

Understand the meaning of the flow light:

A

FLOW Light (amber) illuminates with a closed outflow valve and a cabin climb rate is detected.

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5
Q

AIR_005

Understand the function of the air conditioning shutoff switch:

A
  • OVRD - Deactivates auto shutdown of a/c packs.
  • AUTO - Automatically shuts down packs if either engine fails during takeoff (cabin differential pressure of less than 1.3 psid.)

NOTE: Excessive thrust during one engine taxi may activate this automatic shutdown circuit and shut off both packs. Subsequent thrust reduction will restart the packs.

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6
Q

AIR_006

Function of the L/R pneumatic X-FEED valve levers (Open):

A

OPEN - Opens respective X-FEED valve.

  • Ground: Supplies APU bleed air or air from pneumatic ground source for operation of one or both a/c packs and for engine start.
  • In flight: Supplies bleed air requirements for airfoil ice protection.

CLOSED - Closes respective X-FEED valve.

  • Ground: Shuts off APU bleed air or air from a pneumatic ground source used for operation of one or both a/c packs, or for engine start.
  • In flight: - Shuts off bleed air supply for airfoil ice protection system and for opposite engine pneumatic starts. A/C Pack pneumatic supply is from its respective engine only.
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7
Q

AIR_010

Explain the function of the CABIN ALT Control Wheel:

A
  • When cabin altitude control is selected to auto, the control wheel rotates as cabin air outflow valve automatically adjusts to maintain cabin altitude.
  • When cabin altitude control is selected to manual, control wheel is locked in position. To adjust cabin altitude, push down on the control wheel and rotate in the desired direction. The Outflow Valve Position Indicator will indicate the position of cabin air outflow valve
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8
Q

AIR_011

Explain the difference between the AUTO and HP BLD OFF positions of the air conditioning L/R SUPPLY Switches:

A
  • HP BLD OFF - Closes the augmentation valve inhibiting utilization of high stage bleed air.
  • AUTO – If the low stage pneumatic supply pressure is too low, augmentation valve opens to supply high stage bleed air pressure.
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9
Q

AIR_015

Explain the operation of RADIO RACK Switch:

A
  • VENTURI - Turns off radio rack fan. Opens venturi valve.
  • FAN - Turns on primary radio rack fan and closes venturi valve to cool radio rack and heat forward cargo compartment. If primary fan fails in flight, the standby radio rack fan automatically comes on.

NOTE: On the ground, both primary and standby radio rack fans are on, and the venturi valve is closed.

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10
Q

ICE_001

Recall the function of TAIL De-Ice Pushbutton:

A

• Push - (Air foil system in-use) Closes shutoff valve to wing and opens the shutoff valve to tail to allow 2.5 minutes of tail de-ice. The system automatically reverts to wing anti-ice function following the 2.5 minutes of tail de-ice function.

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11
Q

ICE_002

(88) Understand how to activate air foil ice protection:

A

• The system is activated by selecting AIR FOIL switch ON and placing the crossfeed valve(s) to OPEN.

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12
Q

ICE_003

Understand the effect of moving Ice Protection Panel METER SEL & HEAT Selector switch out of the off position:

A

Moving selector to any position except OFF energizes all heater circuits, except RAT(88)/TAT(90) probe while on the ground.

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13
Q

ICE_004

(90) Function of Ice FOD Alert system:

A
  • Active only on the ground, alerts pilots to presence of wing upper surface ice caused by cold-soaked fuel or environmental icing.
  • Overwing ice sensors, located near inboard aft corner of each main wing tank, detect ice buildup in these areas.
  • L/R ICE FOD ALERT, when displayed on OAP, indicate presence of ice build-up on the wing upper surface.
  • ICE FOD RESET/TEST switch (spring-loaded to center) located on overhead panel, tests and resets system.
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14
Q

ICE_005

Recall the function of WINDSHIELD ANTI-ICE switch:

A
  • OFF - Deactivates windshield anti-ice system.
  • ON - Provides electrical heat to outside of CA’s, Center, and FO’s windshields.
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15
Q

ICE_007

Recall the airfoil anti ice protection cycle:

A
  • Air foil ice protection is only available in-flight.
  • System activated by selecting AIR FOIL sw. to ON and placing crossfeed valve(s) to OPEN. Provides a continuous cycle of heat - Wing leading edges (slats) and forward strakes for fifteen minutes, followed by - 2 1/2 minutes of heat to horizontal stabilizer. - Ram air inlet is heated during both cycles.
  • The MD-88 forward fuselage strakes are pneumatically heated when the AIR FOIL switch is selected ON.
  • Automatic cycle can be overridden by TAIL button which, when pushed, provides for 2 1/2 minutes of horizontal stabilizer de-icing, after which a new wing cycle starts.
  • Placing the AIR FOIL switch to the OFF position causes the horizontal stab. de-icing cycle to be activated for 2 1/2 minutes.
  • MD-90 - With air foil ice selected, moving the flaps to 40 will activate both wing and tail anti-ice valves simultaneously, and the WING ANTI-ICE ON and TAIL DE-ICE ON lights will illuminate until the airplane is on the ground or flaps are repositioned to less than 40.
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16
Q

ICE_009

(88) Understand the function of OVERWING HEATER Switch:

A
  • ARM - Provides electrical power to wing heater control units when the airplane is on the ground. - Switch normally guarded to this position.
  • OFF - Removes electrical power from heater control units.
17
Q

ICE_010

(88) Understand the function of Overwing Heater system:

A
  • The overwing heater system prevents buildup of ice (from condensation cooled by super cooled fuel) on inboard corner of upper wing.
  • The overwing heater system does not de-ice the entire wing nor does it provide anti-ice or de-ice capability for environmental icing conditions.
18
Q

ICE_011

(MD-88) Describe the indications on the OAP when engine anti-ice is in use:

A

MD-88

  • When selected ON, amber (L/R) ENGINE VALVE message will appear on OAP indicating valves are in transit and disagree w/ switch position.
  • When at least 1 valve is fully open, blue (L/R) ENGINE ANTI-ICE ON light on OAP illuminates.
  • When all 3 valves are fully open, amber message extinguishes and blue light remains illuminated indicating normal system operation.
19
Q

(MD-90) Describe the indications on the OAP when engine anti-ice is in use:

A
  • When selected ON, engine ignition is activated and 7th stage valve opens providing air for engine anti-icing to cowl only. - Activates electrically heated fuselage strakes. Amber (L/R) ENGINE VALVE msg appears on OAP, indicating that engine anti-ice valve position disagrees w/ ENG anti-ice switch position.
  • Blue (L/R) ENG ANTI-ICE ON indicates engine nose cowl and fuselage strake anti-ice selected.

NOTE: On MD-90, rubber coated tip is mounted slightly off-center to prevent ice buildup on spinner.

20
Q

ICE_012

Describe the conditions that require use of engine anti-ice while on the ground / inflight:

A
  • Ground: Must be on after start when ambient temp ≤6°C(42°F) w/ any of the following conditions:
    • Visible moisture is present. Visible moisture may be fog, rain or snow. Fog is considered visible moisture when it limits visibility to 1 mile or less.
    • A 3° or less temp/dewpoint spread exists.
    • Runways and taxiways are wet
  • Flight: Engine anti-ice is required when TAT/RAT is 10℃ or below with visible moisture. Engine Anti-ice should be used prior to entering icing conditions.

Delta MD-88 eSV (16 decks)

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