Pneumatic Surface De-ice

Question 1

This is used on turbo prop commuter type aircraft

Inflatable rubber that are designed to remove ice

can be found on leading edge of the wings and stabilizers

Answer 1

PNEUMATIC SURFACE DEICE (BOOTS)

Question 2

Where do we get the air to inflate the boots?

Answer 2

For turbine engine: uses BLEED AIR

For Reciprocating engines:

• Engine drive vane type: VACUUM PUMPS
• TURBOCHARGER

Question 3

Carbon rotor vanes wear at a controlled rate

Vacuum pumps can be dry or wet (Modern aircraft use dry air pump)

Engine Driven Vane type pumps

Used in gyro instruments

Answer 3

Piston Engine

DRY AIR PUMP (Vacuum pump)

Question 4

Type of air pumps that are LUBRICATED with engine oil

It needs an AIR/OIL SEPARATOR on the pressure line that prevents lubricating oil from CONTAMINATING the boots causing deterioration.

Answer 4

WET AIR PUMP

Question 5

a SOLENOID operated valve that dumps pressure air overboard when system not in use

Also directs pressure air to system when energized by the switch

Some have built-in pressure relief valve

Answer 5

DUMP VALVE OR CONTROL VALVE

Question 6

It is an electrically operated solenoid valve that DIRECTS either PRESSURE or VACUUM to the BOOTS

as controlled by a TIMER

Answer 6

SHUTTLE VALVE or DISTRIBUTOR VALVE

Question 7

It controls SHUTTLE/DISTRIBUTOR valve

ENSURES proper INFLATION sequence and duration

ACTIVATES the boots AUTOMATICALLY

Answer 7

TIMER or CONTROL UNIT

Question 8

It is used to MAINTAIN vacuum and pressure at the designed level

What is the air inflation pressure?

Vacuum side?

Answer 8

REGULATORS or RELIEF VALVES

15-20 psi

4.5-5.5” Hg

Question 9

How do they attach deicer boots?

Answer 9

newer ones are GLUED

old ones are SCREWED

Question 10

smaller and medium planes uses _______ deicer.

Answer 10

PNEUMATIC deicers while M2 uses thermal

Question 11

What kin of pump is a vacuum pump?

Answer 11

Sliding Vane pump