Aircraft Icing
News
FAA Publishes Holdover Time Tables for Winter 2008-2009
August 28, 2008
The Federal Aviation Administration (FAA) has released its annual update for aircraft operators required to have an FAA approved deicing program. This deicing program update applies primarily to Part 121, 125 and 135 operators. This update provides FAA inspectors and aircraft operators information on holdover times (HOT), a listing of qualified deicing/anti-icing fluids, and recommendations on various other ground deicing/anti-icing issues. While this update does not apply to operations conducted under FAR Part 91, NBAA recommends that Members review the notice for updated information and issues related to their operation. For further information, download the update.
FAA Issues Notice on Ice and Heavy Snow Conditions; Copy Available at NBAA Web Site
October 8, 2007
The FAA has published Notice 8900.19 regarding allowance times in ice pellet conditions, procedures and limitations for pilot assessment of precipitation intensity and dispatch in heavy snow conditions. This notice applies primarily to certificate holders and fractional program managers that have FAA-approved deicing/anti-icing programs or plans. During the winter of 2006 and 2007, operations in light ice pellets were approved with an allowance time of 25 minutes. After conducting additional research, the FAA has extended allowance times for operations in various ice and heavy snow conditions. For further information, download the notice (118, KB, PDF).
FAA Publishes Holdover Time Tables for Winter 2007-2008
October 8, 2007
The Federal Aviation Administration (FAA) has released its annual update for aircraft operators required to have an FAA approved deicing program. This
deicing program update applies primarily to Part 121,
125 and 135 operators. This update provides FAA inspectors and aircraft operators information on holdover times
(HOT), a listing of qualified deicing/anti-icing fluids, and recommendations on various other ground deicing/anti-icing issues. While this update does
not apply to operations conducted under FAR Part 91, NBAA recommends that Members review the notice for updated information and issues related to their
operation. For further information, download the update (280 KB, PDF).
NTSB Issues Safety Recommendation Regarding Anti-Ice Operations
August 28, 2006
On August 25, 2006, the NTSB recommended that the FAA take action to address safety issues identified in the Safety Board's investigations of several
high-altitude, dual-engine flameouts that have occurred on Raytheon Beechjet 400 series airplanes powered by Pratt & Whitney Canada JT15D-5 turbofan
engines. NTSB Safety Recommendation A-06-56-59 advises the FAA to issue requirements for pilots and flight manuals of Raytheon's Beechjet 400 and other
JT15D-5-powered aircraft. It also recommends that the FAA "work with engine and airplane manufacturers and other industry personnel as well as the
appropriate international airworthiness authorities to actively pursue research to develop an ice detector that would alert pilots to internal engine
icing and require that it be installed on new production turbojet engines, as well as retrofitted to existing turbojet engines." For full details, download
NTSB Safety Recommendation A-06-56-59.
FAA Issues Urgent Reminder to Air Carriers Regarding Operating in Ice Pellet/Snow Conditions
On December 21, 2005, the Federal Aviation Administration (FAA) issued a reminder to airlines, charter operators and FAA inspectors that operating in
ice pellet conditions with anti-icing fluids on the critical surfaces of an aircraft is contrary to FAA guidance and policy expressed in Notice
8000.309: Dispatching During Precipitation Conditions of Ice Pellets, Snow Pellets, or Other Icing Events for which No Holdover Times Exist (11KB,
PDF) and Notice 8000.313: Parts 121 and 135 Operations Specification for Deicing/Anti-Icing, Operations in
Ice Pellets without Deice/Anti-Ice Fluids (31KB, PDF). The FAA stated that the Agency does not have sufficient data at this time to approve such
operations; therefore, such operations are considered to be potentially hazardous. NBAA urges all Part 135 certificate holders to review their flight
release procedures and anti-ice/deice programs to ensure they are in full compliance with FAA regulations and guidance. Read
the FAA’s reminder.
FAA Issues Notice on Reevaluation of Deicing Programs
October 5, 2005
In Notice 8000.308, the FAA provides guidance and information for aircraft operators regarding the evaluation of deicing/anti-icing programs. This notice
applies to Part 125 and Part 135 certificate holders that have elected to operate with a program approved under Part 121.629(c). The notice stresses
the need for reevaluation by each certificate-holding district office and certificate holder of the holder's deicing/anti-icing program and outlines
specific areas of concern. Using the system safety principles and risk assessment process, the FAA determined that programs requiring FAA approval, such
as ground deicing/anti-icing programs, would have the highest degree of inherent risk and, as such, were determined to be the most critical due to the
approaching 2005–2006 winter season. Download the notice (36 KB, PDF)
NTSB Issues Wing Upper Surface Ice Accumulation Alert
On December 29, 2004, the National Transportation Safety Board (NTSB) issued an alert to pilots regarding wing upper surface ice accumulation: "Ice accumulation
on the wing upper surface is very difficult to detect. It may not be seen from the cabin because it is clear/white and it is very difficult to see from
the front or back of the wing. The Safety Board believes strongly that the only way to ensure that the wing is free from critical contamination is to
touch it." The advisory also cites a previous NTSB report: "According to wind tunnel data, a wing upper surface roughness caused by particles of only
1–2 mm diameter (the size of a grain of table salt), at a density of about one particle per square centimeter, can cause lift losses of about 22
and 33 percent, in ground effect and free air, respectively." View the complete NTSB Advisory
Additional Aircraft Icing Resources
NASA Icing Training Online Courses
This web site contains free icing training courses and resources for pilots who want to learn more about aircraft icing and what they can do about it.
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