By Robert L. Sumwalt
Tomorrow and Wednesday, June 21 and 22, NTSB will have a forum on pilot weather reports (PIREPs). Why is this topic important? We became interested in PIREPs by accident – several of them, in fact. As our accident investigators will discuss in the forum, after several years of weather encounter-related accident and incident investigations, we found that there were too many instances where weather information had been observed but had not made it into the cockpits of those who needed it most.
One such event occurred in March 2012, in Anchorage, Alaska. A Learjet 35A encountered severe in-flight icing conditions that exceeded the capabilities of the airplane’s windscreen anti-ice systems, and the airplane’s windscreen abruptly iced over. As a result, the flight crew lost all forward visibility, and the airplane veered off the runway during landing and came to rest in a snow bank.
The NTSB found that the severe icing conditions had been conveyed about 15 minutes before the Learjet encountered them.
A pilot in an F-16 conducting an approach to an Air Force Base about 7 miles northeast reported “severe icing on final” and initiated a go-around to “wait until his windshield…cleared.” The controller handling the F-16 shared this information with the controller who later handled the Learjet; however, the controller handling the Learjet did not relay the urgent PIREP to the Learjet flight crew.
In this case, the NTSB determined that the approach controller’s failure to relay the PIREP was a contributing factor to the incident.
The problem doesn’t lie solely with ATC not disseminating weather information. As a former airline pilot and line check airman, I know that sometimes pilots do not relay weather information to ATC. And, when they do, the information is prone to inaccuracies, especially regarding time, location, and weather intensity.
To their credit, many people have been trying for years to get the PIREP system to work better, and many of them will be participating in the forum. That’s precisely why we wanted to have this event – to bring together key players with knowledge of the PIREP system to begin a conversation about improving it. And we hope that this conversation continues, planting the seed for collaborative action.
The forum will be open to the public and will also be webcast. We hope you can join us, either in person or online.
Robert L. Sumwalt is an NTSB Board Member.