cancidas
Posts: 3985
Joined: Thu Jul 03, 2003 7:34 am

Commercial A/C De-icing

Tue Jul 15, 2003 5:39 am

Do commercial A/C have de-icing boots or do they just use heated surfaces?
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m717
Posts: 540
Joined: Tue Dec 31, 2002 1:01 pm

RE: Commercial A/C De-icing

Tue Jul 15, 2003 6:31 am

"Commercial A/C" covers a very broad range of equipment. As a general statement, most transport jet aircraft (B-737, 757, DC-9, A-320, etc.) use heated surfaces. On the other hand, many turboprop aircraft (DHC-8, ATR-42/72, SF-340, SA-227, BE-1900, etc.) have de-ice boots.
 
KAUSpilot
Posts: 1659
Joined: Mon Jan 28, 2002 2:15 pm

RE: Commercial A/C De-icing

Tue Jul 15, 2003 6:43 am

Both. Some aircraft (mostly smaller turbine aircraft and piston aircraft) use pneumatic de-ice boots which expand and "knock off" layers of ice after they have built up on aircraft leading edge surfaces.

Other aircraft (larger jets) are equipped with a thermal leading edge anti-ice system. Here, hot, high-pressure engine bleed air is routed under leading edge surfaces to prevent the formation of ice. The main advantage of the thermal system is that it can be used in a preventive fashion, whereas it is usually inadvisable to active pneumatic boots until a pre-determined amount of ice has already built up on the aircraft. The disadvantages of thermal systems are that they use a good deal of engine power, because they draw off of air from the compressor sections of the engine, and they usually should not be used on the ground because warping of the aircraft metal can occur due to the relatively high temperatures encountered at ground level compared to cruising altitude.

Still other types of aircraft incorporate liquid ice protection (weeping wing). Basically, in these systems an anti-ice fluid is secreted through tiny pores in the wings. There are also electrically heated de-icing boots where are too energy demanding to use on large surfaces but are commonly found in use on propeller blades.
 
Boeing4ever
Posts: 4479
Joined: Thu Apr 26, 2001 12:06 pm

RE: Commercial A/C De-icing

Tue Jul 15, 2003 12:27 pm

Any photos that show these de-icing boots in detal?

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avt007
Posts: 1989
Joined: Mon Jul 10, 2000 4:51 am

RE: Commercial A/C De-icing

Thu Jul 24, 2003 2:55 pm

Two points from a mtce guy- the air for heated surfaces is regulated to low pressure, approx 30 psi. Boots are ok, but require FAR more mtce than hot leading edges.
 
L-188
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Joined: Wed Jul 07, 1999 11:27 am

RE: Commercial A/C De-icing

Thu Jul 24, 2003 3:04 pm

Also, consider that the Shorts SC-7 uses a TKS system for the tail surfaces.

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avt007
Posts: 1989
Joined: Mon Jul 10, 2000 4:51 am

RE: Commercial A/C De-icing

Sun Jul 27, 2003 1:41 pm

OK, I'll bite, what's a TKS system?

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