The FAA today released a new fact sheet, “Safer Flying in Icing Conditions,” to remind operators that aircraft icing is a “continuing concern in all parts of aviation, from small planes to jumbo jets.” To combat icing-related accidents, the FAA is employing a multi-pronged approach to icing issues, using immediate safety actions and longer-term rule changes.
American Eagle Flight
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.
A proposed AD would require the installation of deicing boots on the landing-gear struts of nearly 750 U.S.-registered Cessna 208 Caravans, as well as other changes to deicing equipment and procedures contained in a 1991 Cessna accessory kit. The directive stems from the FAA’s investigation into nine incidents within the past few months and six accidents in the previous two icing seasons.
The NTSB is asking the FAA to require Part 121 and 135 airlines to incorporate bounced landing recovery techniques in their flight manuals and to teach these techniques during initial and recurrent training.
The NTSB determined today that the Feb. 16, 2005 crash of a Circuit City Cessna Citation 560 during the approach to Pueblo Memorial Airport, Colo., was caused because during the approach, as they flew through a cloud containing supercooled liquid droplets, the flight crew didn’t activate the deicing boots at the first sign of ice buildup (as specified in the AFM) and possibly not at all, and didn’t monitor airspeed, which led to a stall.
In its determination of the probable cause of the PenAir Caravan crash, the Safety Board also said that a factor contributing to the accident “was the lack of a preflight inspection requirement to examine at close range the upper surface of the wing for ice contamination when ground icing conditions exist.” Such a requirement is now on the books, the result of an AD issued in March following an FAA investigation into incidents involving Carava
Further icing accidents and incidents involving the Cessna Caravan, flight manual revisions that contain erroneous data and recent flight tests prompted the FAA last week to issue AD 2006-06-06. The new directive supercedes AD 2005-07-01 issued last March.
Part 25 aircraft likely to get more stringent icing rules
As I prepared to pen yet another article dealing with winter operations, the realization hit me that we will likely have ice-related accidents. It seems that every winter we are peppered with articles dealing with many of the issues that need to be addressed to maintain safe flight under some challenging conditions.