Dl757md From United States of America, joined May 2004, 1555 posts, RR: 18 Reply 1, posted (8 years 2 months 4 weeks 23 hours ago) and read 2735 times:
I don't have any hard data to support it, but my observation has been that in regard to the metal there is no effect. With respect to components I haven't seen any problems. I have seen faulty wiring that while not caused by the de-ice fluid has been discovered because of it causing a short to ground due to poor insulation. The only other damage I've seen was on a 767-400 raked wingtip that was damaged by the impact of the jet of fluid from the de-ice truck.
Air2gxs From , joined Dec 1969, posts, RR: Reply 2, posted (8 years 2 months 4 weeks 22 hours ago) and read 2396 times:
We have found that fluid enters component connectors and can cause problems over time. We are currently in the process of changing all the yaw damp servo connectors on our B757/B767 fleets due to reliability issues traced back to glycol contamination.
Another issue is that an overly agressive approach to ice removal may in fact wash lubricant away the affected areas.
Amtrosie From United States of America, joined Jan 2005, 274 posts, RR: 1 Reply 3, posted (8 years 2 months 4 weeks 18 hours ago) and read 2294 times:
In previous lifetimes (former employers) we had to caution the de-icing personel against direct spray at gear components and flight control hinge points. It seems that the fluid was under high enough pressure to force out the lubricating grease. As has been stated, electrical connectors often fell victim to the fluid. All in a days work.....
Troubleshooter From Germany, joined Feb 2005, 423 posts, RR: 5 Reply 6, posted (8 years 2 months 4 weeks 10 hours ago) and read 2266 times:
On aircrafts with fully mechanical operated flight controls, there is a risk of a flight control surface jam after treatment with de-icing fluid. This can happen, if fluid residues remain in the small gaps between the surface and the control flap wich is moved by the pilots. At higher altitudes the fluid residues in combination with humidity can freeze and block the tabs. On the BAe146/RJ for example, the elevators and ailerons are affected. We have to inspect and clean these flight controls after a certain time, if the aircraft has received a de-icing treatment with fluid II or IV.
As you can not clearly identify dry residues, you have to spray some warm water on the surfaces. Then wait approx. ten minutes. De-Icing residues will form a gel in combination with water. They consist of a thickening agent wich remains after all glycol is evaporated. If something was found, you have to carefully clean everything before releasing the aircraft to service.