Pilots should “activate boots as soon as the airplane enters icing conditions,” according to a safety alert released in December by the NTSB. The alert (SA-014) is yet another attempt by the Board to persuade pilots that there is no such thing as ice bridging and that pilots should not wait for ice to build to one-quarter to one-half-inch thickness before inflating boots in icing conditions.
Cessna Citation 500, Beverly, Mass., March 17, 2007–The NTSB determined the probable cause of the Air Trek Citation icing accident was the inadequate guidance
Last month the FAA issued a Special Airworthiness Information Bulletin (SW-08-03) containing “recommendations for rotorcraft during icing conditions.” The SAIB describes “procedures to reduce the probability of an engine in-flight shutdown due to ice and snow ingestion,” including special precautions during winter pre-flights and ground power settings.
Du Pont has introduced a wiping product that the diversified industrial company said is designed exclusively for aircraft windshields and passenger windows. Made from a proprietary blend of fibers, the company said its Sontara window wipes are intended to be used with approved cleaning solutions (such as Prist and Aviation Laboratory) on acrylic, polycarbonate and glass transparencies.
The FAA last month released a final rule governing certification of transport-category (Part 25) airplanes for operation in icing conditions. The new rule, which takes effect October 9, effectively added new material to Part 25, Appendix C, the section that details the so-called icing envelope.
The FAA yesterday released a final rule governing certification of transport-category (Part 25) airplanes for operation in icing conditions, effective October 9. In publishing the new rules, the FAA added new material to Part 25, Appendix C, the section that details the so-called icing envelope. The new Appendix C material, however, does not address the NTSB’s desire for the icing envelope to be expanded to include larger icing droplets.
Summer is almost upon us in the northern hemisphere, but the FAA is embroiled in two significant icing-related issues: a proposed new rule for when de-ice systems are activated and a new interpretation of the term “known icing.”
Every few years, a debate erupts about whether the phenomenon of ice bridging is real or something questionable that pilots discuss while hangar flying or warning of the dangers of flying in icing conditions. The issue recently resurfaced at an NTSB public meeting about the icing-related crash of a Cessna Citation 560 in Pueblo, Colo., on Feb. 16, 2005.
Cessna 550 Citation II, Ft. Yukon, Alaska, Sept. 30, 2005–The captain, copilot and two research scientists were not seriously injured when Citation N77ND made an off-airport, gear-up emergency landing after both engines quit simultaneously. The University of North Dakota flight was doing icing research in IFR conditions when the accident occurred.
The NTSB concluded that the forced landing of a University of North Dakota Citation 550 research jet on Sept. 30, 2005, in Fort Yukon, Alaska, was caused by the pilot’s “improper use of anti-icing,” which resulted in ice ingestion into both engines and the complete loss of power. No one was seriously injured.