Anti-ice, Rain

Question 1

How do you activate airfoil ice protection

Answer 1

By selecting the AIR FOIL switch to ON and placing the cross feed valve(s) to OPEN

Question 2

What’s the function of the WINDSHIELD ANTI-ICE switch

OFF
ON

Answer 2

1. OFF - deactivates the windshield anti-ice system

2. ON - provides electrical heat to the outside of Captains Center, and first officers windshields

Question 3

What’s the effect of moving the Ice Protection Panel METER SEL and HEAT Selector switch out of the off position

Answer 3

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

Question 4

What’s the function of the OVERWING HEATER Switch

ARM
OFF

Answer 4

1. ARM - provides electrical power to the wing heater control units when the airplane is on the ground. The switch is normally guarded to this position
2. OFF - removes electrical power from the heater control units

Question 5

What’s the function of the Overwing heater system

Answer 5

1. Prevents the buildup of ice on the inboard corner of the upper wing
2. It does not deice the entire wing nor does it provide anti-ice or de-ice capability for environmental icing conditions

Question 6

What’s the function of the TAIL De-ice Pushbutton?

Answer 6

Push - (air foil system in use) closes the shutoff valve to the wing and opens the shutoff valve to the tail to allow 2.5 minutes of tail deice. The system automatically reverts to wing anti ice function following the 2.5 min. Of tail deiceing

Question 7

Describe the conditions that require the use of engine and anti ice while on the ground/in flight

Answer 7

Ground- must be on after start when the ambient temp is 6C (42F) or below and any of the following conditions exist:

1. Visible moisture including fog when it limits vis to 1 mile or less
2. A 3* temp/dew point spread
3. Runways and taxiways are wet

Flight - when TAT/RAT is 10*C or below in visible moisture. Should be used prior to entering icing

Question 8

What’s the function of the Ice FOD Alert system(4)

Answer 8

1. Active only on the ground and used to alert the pilots to the presence of wing upper surface ice caused by cold-soaked fuel or environmental icing
2. Overwing ice sensors, located near the inboard aft corner of each main wing tank, detect ice buildup in these areas
3. L/R ICE FOD ALERT, when displayed on the OAP, indicates ice buildup on the wing upper surface
4. An ICE FOD RESET/TEST switch(spring loaded to center) is located on the overhead panel to test and to reset this system

Question 9

What’s the airfoil anti ice protection cycle

When can it be used?
How do you turn it on?
What's the cycle?
Tail button?
Ram air?
Strakes?
90 differences?

Answer 9

1. Only available in flight
2. Activated by selecting the AIR FOIL switch to ON and cross feed valves to OPEN which provides a continuous cycle of heat for the leading edge of the wings(slats) for 15 minutes, followed by 2.5 minutes to the horizontal stabilizer.
   - The ram air inlet is heated during both cycles
3. The MD88 forward fuselage strakes are pneumatically heated when switch is selected ON
4. The auto cycle can be overridden by the TAIL button which provides 2.5 mins of horizontal stab deiceing after which a new wing cycle starts
5. Putting AIR FOIL switch OFF causes the horiz stab de-icing cycle to be activated for 2.5 minutes
6. MD90 - with air foil 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 if on grnd or flaps are less than 40

Question 10

What are the indications on the OAP when engine anti ice is use
MD88
MD90

Answer 10

MD88

1. When ON - Amber (L/R) ENGINE VALVE message indicating the valves are in transit and disagree with switch position
2. When one valve is fully open a blue(L/R) ENGINE ANTI ICE light illuminates on OAP
3. When all 3 valves are fully open, Amber message extinguished and blue light stays on indicating normal ops

MD90

1. When ON, activated engine ignition and opens the 7th stage valve to provide air for engine anti icing to the cowl only. Activated electrical heated fuselage strakes. Amber (L/R) ENGINE VALVE message appears on OAP indicating that the engine anti ice valve pos disagrees with ENG anti ice switch position
2. Blue (L/R) ENG ANTI ICE ON indicates that eng nose cowl and fuselage strake anti ice is selected

Question 11

What prevents ice build up on the spinner on the MD90

Answer 11

A rubber coated tip slightly off center