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vortex encounters are subsequently invited to complete
a web- or phone-based set of supplemental questions. To
date, 74 ASRS reporters have agreed to participate in
the study. All identifying information (names, company
affi liations, etc.) are removed before the ASRS research
data are provided to the FAA.
The study focuses on any U.S. location at which a wake
vortex incident occurs, including airports (all runway
confi gurations – closely-spaced parallel, in-trail, and
crossing runways) and the en route environment. Some
of the factors analyzed include the magnitude of the
wake encounter, aircraft spacing, aircraft type, runway
confi guration, and consequences of the encounter.
If you experience a wake vortex incident, please keep in
mind that your report of the incident will be a valuable
addition to the ASRS study. Your participation in the wake
vortex study will enhance the FAA’s understanding of
related aircraft separation and airport capacity issues.
To participate, simply fi le an ASRS report describing the
incident, and you will be contacted by ASRS and provided
information about fi lling out the supplemental Wake
Vortex questionnaire.
ASRS Wake Vortex Study Update
Number 351 March 2009
A Monthly Safety Bulletin from
The Office of the NASA
Aviation Safety Reporting
System,
P.O. Box 189,
Moffett Field, CA
94035-0189
http://asrs.arc.nasa.gov/
January 2009 Report Intake
Air Carrier/Air Taxi Pilots 2509
General Aviation Pilots 727
Controllers 42
Cabin/Mechanics/Military/Other 364
TOTAL 3642
Effective communications are an integral part of safe
operation in today’s National Airspace System. This
month’s CALLBACK focuses on communications-related
incidents reported by a controller and several pilots.
These include:
• Misuse of Guard frequency (121.5 MHz)
• ATC emergency handling
• TFR avoidance
• Compliance with charted procedures, and
• Clearance clarity.
Misuse of Guard Frequency (121.5 MHz)
In the U.S., the emergency frequency 121.5 MHz is guarded
(monitored) by military towers, most civil towers, FSS’s,
radar facilities, and many airliners. This frequency is reserved
solely for emergency communications for aircraft in distress.
A radar controller reported an incident to ASRS in which two
air carrier flight crews misused the Guard frequency.
n While working the radar position…I heard aircraft X call
aircraft Y over the 121.5 emergency frequency. This is not
uncommon, but annoying because it comes out the same
loudspeaker as the landline calls and, thus, must be fairly
loud. There was no response to aircraft X’s call. A few minutes
later aircraft X again called aircraft Y. I assumed at this point
that aircraft Y must have gone no-radio and aircraft X was
trying to help locate him. Again, no response…After aircraft
X had called aircraft Y for the third or fourth time on the
emergency frequency…aircraft Y replied, ‘This is aircraft Y.’
At this point, aircraft X said, ‘We’re going to be arriving just
a few minutes behind you, so would you hold the van for us
so we can get to the hotel?’ I keyed up and said, ‘This doesn’t
sound like an emergency.’ Both pilots then responded with
comments about, ‘Where’s the Guard Police when you need
them?’ and ‘Must not be a very busy night.’
Apparently these pilots who were at FL350 and FL390 don’t
realize that, at those altitudes, their radio range is several
hundred miles. Since this emergency frequency is monitored at
[most] ATC facilities, I suspect that their conversation came
over the loudspeakers in at least 3 Centers, probably a dozen
Approach Controls, dozens of Towers, multiple RCO [Remote
Communications] outlets at AFSS [Automated Flight Service
Station], plus hundreds of commercial aircraft cockpits. I
suspect someone at one of these locations was busy and was
probably distracted, at least momentarily, from their primary
safety function. I also suspect that the airline has some other
method for inter-aircraft communications. It is events like this
that make controllers, and probably pilots, instinctively turn
ASRS Alerts Issued in January 2009
Subject of Alert No. of Alerts
Aircraft or aircraft equipment 13
Airport facility or procedure 11
Chart, publication, or nav database 4
Maintenance procedures 1
Total 29
down a speaker that is making noise in the background. A
subsequent actual emergency call could go unheard because
　
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