How Do You Hear Me?: #10 Declaring an Emergency
By Robert Gray, ATP CFI
Synopsis: A PA28 pilot experienced a rough running engine on an IFR flight plan and declared an emergency. Initial corrective actions had no positive effect. After the aircraft descended out of IMC the engine returns to smooth running and the flight continued to destination.
Synopsis: A C182 developed a rough running engine at 13,500 FT in marginal weather. The pilot declared an emergency with ATC, safely diverted into a VMC airport, landed with normal engine power and assumed carburetor icing was the earlier problem.
Synopsis: A DA50EX experienced fluctuating airspeed and altitude indications after takeoff. The crew could not determine the cause, therefore an emergency was declared as they diverted to a nearby VMC airport.
These recent reports were obtained from NASA’s Aviation Safety Reporting System (ASRS) and are available to you at http://asrs.arc.nasa.gov/. The ASRS database is the world’s largest repository of voluntary, confidential safety information provided by aviation’s frontline personnel, including pilots, controllers, mechanics, flight attendants, and dispatchers. ASRS’s database includes the narratives submitted by reporters (after they have been sanitized for identifying details). These narratives provide an exceptionally rich source of information for policy development, human factors research, education, training, and more.
In each of the real-life examples provided in this narrative, the pilot experienced an in-flight problem serious enough to declare an emergency. And in each case, the pilot successfully navigated to and landed safely at a nearby airport. But what exactly does it imply when a pilot encounters an “emergency” situation? Let’s start with 14 CFR 91.3 which states “In an emergency requiring immediate action, the pilot in command may deviate from any rule… to the extent required to meet the emergency.” In addition, 91.113 states “An aircraft in distress has the right-of-way over all other air traffic.” If you are able to declare an emergency with Air Traffic Control, rest assured that you will receive priority handling. Remember, ATC is a terrific resource and can be of great assistance in helping you work through an emergency. For example, ATC can clear the area ahead of potential traffic conflicts, provide radar vectors to a nearby airport and even give you permission to land on any runway available.
According to the AIM, “A pilot who encounters a distress or urgency condition can obtain assistance simply by contacting the air traffic facility or other agency in whose area of responsibility the aircraft is operating, stating the nature of the difficulty, pilot’s intentions and assistance desired. Distress and urgency communications procedures are prescribed by the International Civil Aviation Organization (ICAO) [Section 6-3-1 - Distress and Urgency Communications].
Aircraft in Distress: The initial communication, and if considered necessary, any subsequent transmissions by an aircraft in distress should begin with the signal “MAYDAY”, preferably repeated three times. Distress communications have absolute priority over all other communications, and the word MAYDAY commands radio silence on the frequency in use. (Examples: fire, mechanical failure, or structural damage [AIM 6-1-2]). May-day is derived from French - m’aider, help me! The Pilot/Controller Glossary defines the term as, “The international radiotelephony distress signal. When repeated three times, it indicates imminent and grave danger and that immediate assistance is requested.”
Aircraft with an Urgency Condition: The signal “PAN-PAN” should be used in the same manner for an urgency condition. Urgency communications have priority over all other communications except distress, and the word PAN-PAN warns other stations not to interfere with urgency transmissions. (Examples: the moment a pilot becomes doubtful about position, fuel endurance, weather or any other condition that could adversely affect flight safety [AIM 6-1-2]). Pan-pan is also derived from French: panne – a breakdown. The Pilot/Controller Glossary defines the term as, “The international radio-telephony urgency signal. When repeated three times, indicates uncertainty or alert followed by the nature of the urgency.
Radio Communication Frequencies: Although the frequency in use or other frequencies assigned by ATC are preferable, the following emergency frequencies can be used for distress or urgency comunications, if necessary or desirable: 121.5 MHz and 243.0 MHz. Both have a range generally limited to line of sight. 121.5 MHz is guarded by direction finding stations and some military and civil aircraft. 243.0 MHz is guarded by military aircraft. Both 121.5 MHz and 243.0 MHz are guarded by military towers, most civil towers, FSSs, and radar facilities. Normally ARTCC emergency frequency capability does not extend to radar coverage limits. If an ARTCC does not respond when called on 121.5 MHz or 243.0 MHz, call the nearest tower or FSS.
Minimum Fuel: A pilot declaring “MINUMUM FUEL” indicates that an aircraft’s fuel supply has reached a state where, upon reaching the destination, it can accept little or no delay. This is not an emergency situation but merely indicates an emergency situation is possible should any undue delay occur [Pilot/Controller Glossary]. “A minimum fuel advisory does not imply a need for traffic priority. Common sense and good judgment will determine the extent of assistance to be given in minimum fuel situations. If, at any time, the remaining usable fuel supply suggests the need for traffic priority to ensure a safe landing, the pilot should declare an emergency and report fuel remaining in minutes.” [The ATC Handbook (ATP 7110.65P: 2-1-8)].
So, there you have it. A quick summary of three conditions that you hope you’ll never experience: an aircraft in distress, an aircraft with an urgency condition, and an aircraft with minimum fuel. But take a look at NASA’s ASRS database and you’ll find it is replete with examples of pilots who experienced these situations and successfully worked through them. Single pilot and crew resource management practices remind us that when airborne, we are truly not alone. Use all resources available to your advantage.
In closing, I am somewhat reluctant to include communications between a pilot in distress and an Air Traffic Controller. The VFR pilot made an inadvertent flight from VFR conditions to Instrument Meteorological Conditions (IMC). The pilot was very fortunate to have survived the encounter. The information is presented in the interest of education and advancing flight safety:
http://www.youtube.com/watch?v=IMYGHGNZ47I&feature=related
Until next time… EFI