Section 3. Distress and Urgency Procedures
6-3-1. Distress and Urgency
Communications
a. 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), however, and have decided advantages over the informal procedure described above.
b. Distress and urgency communications procedures
discussed in the following paragraphs relate to the use of air ground voice
communications.
c. 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. The signal PAN-PAN should be used in the same
manner for an urgency condition.
d. Distress communications have absolute priority over all
other communications, and the word MAYDAY commands radio silence on the frequency in use. Urgency
communications have priority over all other communications except distress, and the
word PAN-PAN warns other stations not to interfere with urgency transmissions.
e. Normally, the station addressed will be the air traffic facility
or other agency providing air traffic services, on the frequency in use at the time. If
the pilot is not communicating and receiving services, the station to be called will
normally be the air traffic facility or other agency in whose area of responsibility the
aircraft is operating, on the appropriate assigned frequency. If the station addressed
does not respond, or if time or the situation dictates, the distress or urgency
message may be broadcast, or a collect call may be used, addressing "Any Station
(Tower)(Radio)(Radar)."
f. The station addressed should immediately acknowledge a distress
or urgency message, provide assistance, coordinate and direct the activities of
assisting facilities, and alert the appropriate search and rescue coordinator if
warranted. Responsibility will be transferred to another station only if better handling
will result.
g. All other stations, aircraft and ground, will continue to listen
until it is evident that assistance is being provided. If any station becomes aware that
the station being called either has not received a distress or urgency
message, or cannot communicate with the aircraft in difficulty, it will attempt to contact
the aircraft and provide assistance.
h. Although the frequency in use or other frequencies assigned by
ATC are preferable, the following emergency frequencies can be used for distress or
urgency communications, if necessary or desirable:
1. 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, FSS's, 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.
2. 2182 kHz. The range is generally less than 300 miles for
the average aircraft installation. It can be used to request assistance from stations in
the maritime service. 2182 kHz is guarded by major radio stations serving Coast Guard
Rescue Coordination Centers, and Coast Guard units along the sea coasts of the U.S. and
shores of the Great Lakes. The call "Coast Guard" will alert all Coast Guard
Radio Stations within range. 2182 kHz is also guarded by most commercial coast stations
and some ships and boats.
6-3-2. Obtaining Emergency Assistance
a. A pilot in any distress
or urgency condition should immediately take the following action, not
necessarily in the order listed, to obtain assistance:
1. Climb, if possible, for improved communications, and better
radar and direction finding detection. However, it must be understood that unauthorized
climb or descent under IFR conditions within controlled airspace is prohibited, except as
permitted by 14 CFR Section 91.3(b).
2. If equipped with a radar beacon transponder (civil) or IFF/SIF
(military):
(a) Continue squawking assigned MODE A/3 discrete code/VFR code and
MODE C altitude encoding when in radio contact with an air traffic facility or other
agency providing air traffic services, unless instructed to do otherwise.
(b) If unable to immediately establish communications with an air
traffic facility/agency, squawk MODE A/3, Code 7700/Emergency and MODE C.
3. Transmit a distress or
urgency message consisting of as many as necessary of the following
elements, preferably in the order listed:
(a) If distress, MAYDAY, MAYDAY, MAY-DAY; if urgency,
PAN-PAN, PAN-PAN, PAN-PAN.
(b) Name of station addressed.
(c) Aircraft identification and type.
(d) Nature of distress or urgency.
(e) Weather.
(f) Pilots intentions and request.
(g) Present position, and heading; or if lost, last known
position, time, and heading since that position.
(h) Altitude or flight level.
(i) Fuel remaining in minutes.
(j) Number of people on board.
(k) Any other useful information.
REFERENCE-
Pilot/Controller Glossary Term- Fuel Remaining.
b. After establishing radio contact, comply with advice and
instructions received. Cooperate. Do not hesitate to ask questions or clarify instructions
when you do not understand or if you cannot comply with clearance. Assist the ground
station to control communications on the frequency in use. Silence interfering radio
stations. Do not change frequency or change to another ground station unless absolutely
necessary. If you do, advise the ground station of the new frequency and station name
prior to the change, transmitting in the blind if necessary. If two-way communications
cannot be established on the new frequency, return immediately to the frequency or station
where two-way communications last existed.
c. When in a distress condition with bailout, crash landing or
ditching imminent, take the following additional actions to assist search and rescue
units:
1. Time and circumstances permitting, transmit as many as necessary
of the message elements in subparagraph a3
above, and any of the following that you think might be helpful:
(a) ELT status.
(b) Visible landmarks.
(c) Aircraft color.
(d) Number of persons on board.
(e) Emergency equipment on board.
2. Actuate your ELT if the installation permits.
3. For bailout, and for crash landing or ditching if risk of fire
is not a consideration, set your radio for continuous transmission.
4. If it becomes necessary to ditch, make every effort to ditch
near a surface vessel. If time permits, an FAA facility should be able to get the position
of the nearest commercial or Coast Guard vessel from a Coast Guard Rescue Coordination
Center.
5. After a crash landing, unless you have good reason to believe
that you will not be located by search aircraft or ground teams, it is best to remain with
your aircraft and prepare means for signaling search aircraft.
6-3-3. Ditching Procedures
FIG 6-3-1
Single Swell (15 knot wind)
FIG 6-3-2
Double Swell (15 knot wind)
FIG 6-3-3
Double Swell (30 knot wind)
FIG 6-3-4
(50 knot wind)
FIG 6-3-5
Wind-Swell-Ditch Heading
a. A successful aircraft ditching is dependent on three primary
factors. In order of importance they are:
1. Sea conditions and wind.
2. Type of aircraft.
3. Skill and technique of pilot.
b. Common oceanographic terminology.
1. Sea. The condition of the surface that is the result of both
waves and swells.
2. Wave (or Chop). The condition of the surface caused by the local
winds.
3. Swell. The condition of the surface which has been caused by a
distance disturbance.
4. Swell Face. The side of the swell toward the observer. The
backside is the side away from the observer. These definitions apply regardless of the
direction of swell movement.
5. Primary Swell. The swell system having the greatest height from
trough to crest.
6. Secondary Swells. Those swell systems of less height than the
primary swell.
7. Fetch. The distance the waves have been driven by a wind blowing
in a constant direction, without obstruction.
8. Swell Period. The time interval between the passage of two
successive crests at the same spot in the water, measured in seconds.
9. Swell Velocity. The speed and direction of the swell with
relation to a fixed reference point, measured in knots. There is little movement of water
in the horizontal direction. Swells move primarily in a vertical motion, similar to the
motion observed when shaking out a carpet.
10. Swell Direction. The direction from which a swell is
moving. This direction is not necessarily the result of the wind present at the scene. The
swell may be moving into or across the local wind. Swells, once set in motion, tend to
maintain their original direction for as long as they continue in deep water, regardless
of changes in wind direction.
11. Swell Height. The height between crest and
trough, measured in feet. The vast majority of ocean swells are lower than 12 to 15 feet,
and swells over 25 feet are not common at any spot on the oceans. Successive swells may
differ considerably in height.
c. In order to select a good heading when ditching an aircraft, a
basic evaluation of the sea is required. Selection of a good ditching heading may well
minimize damage and could save your life. It can be extremely dangerous to land into the
wind without regard to sea conditions; the swell system, or systems, must be taken into
consideration. Remember one axiom- AVOID THE FACE OF A SWELL.
1. In ditching parallel to the swell, it makes little difference
whether touchdown is on the top of the crest or in the trough. It is preferable, however,
to land on the top or back side of the swell, if possible. After determining which heading
(and its reciprocal) will parallel the swell, select the heading with the most into the
wind component.
2. If only one swell system exists, the problem is relatively
simple-even with a high, fast system. Unfortunately, most cases involve two or more swell
systems running in different directions. With more than one system present, the sea
presents a confused appearance. One of the most difficult situations occurs when two swell
systems are at right angles. For example, if one system is eight feet high, and the other
three feet, plan to land parallel to the primary system, and on the down swell of the
secondary system. If both systems are of equal height, a compromise may be
advisable-select an intermediate heading at 45 degrees down swell to both systems. When
landing down a secondary swell, attempt to touch down on the back side, not on the face of
the swell.
3. If the swell system is formidable, it is considered advisable,
in landplanes, to accept more crosswind in order to avoid landing directly into the swell.
4. The secondary swell system is often from the same direction as
the wind. Here, the landing may be made parallel to the primary system, with the wind and
secondary system at an angle. There is a choice to two directions paralleling the primary
system. One direction is downwind and down the secondary swell, and the other is into the
wind and into the secondary swell, the choice will depend on the velocity of the wind
versus the velocity and height of the secondary swell.
d. The simplest method of estimating the wind direction and
velocity is to examine the windstreaks on the water. These appear as long streaks up and
down wind. Some persons may have difficulty determining wind direction after seeing the
streaks on the water. Whitecaps fall forward with the wind but are overrun by the waves
thus producing the illusion that the foam is sliding backward. Knowing this, and by
observing the direction of the streaks, the wind direction is easily determined. Wind
velocity can be estimated by noting the appearance of the whitecaps, foam and wind
streaks.
1. The behavior of the aircraft on making contact with the water
will vary within wide limits according to the state of the sea. If landed parallel to a
single swell system, the behavior of the aircraft may approximate that to be expected on a
smooth sea. If landed into a heavy swell or into a confused sea, the deceleration forces
may be extremely great-resulting in breaking up of the aircraft. Within certain limits,
the pilot is able to minimize these forces by proper sea evaluation and selection of
ditching heading.
2. When on final approach the pilot should look ahead and observe
the surface of the sea. There may be shadows and whitecaps-signs of large seas. Shadows
and whitecaps close together indicate short and rough seas. Touchdown in these areas is to
be avoided. Select and touchdown in any area (only about 500 feet is needed) where the
shadows and whitecaps are not so numerous.
3. Touchdown should be at the lowest speed and rate of
descent which permit safe handling and optimum nose up attitude on impact. Once first
impact has been made, there is often little the pilot can do to control a landplane.
e. Once preditching preparations are completed, the pilot should
turn to the ditching heading and commence let-down. The aircraft should be flown low over
the water, and slowed down until ten knots or so above stall. At this point, additional
power should be used to overcome the increased drag caused by the nose up attitude. When a
smooth stretch of water appears ahead, cut power, and touchdown at the best recommended
speed as fully stalled as possible. By cutting power when approaching a relatively smooth
area, the pilot will prevent overshooting and will touchdown with less chance of planing
off into a second uncontrolled landing. Most experienced seaplane pilots prefer to make
contact with the water in a semi-stalled attitude, cutting power as the tail makes
contact. This technique eliminates the chance of misjudging altitude with a resultant
heavy drop in a fully stalled condition. Care must be taken not to drop the aircraft from
too high altitude or to balloon due to excessive speed. The altitude above water depends
on the aircraft. Over glassy smooth water, or at night without sufficient light, it is
very easy, for even the most experienced pilots to misjudge altitude by 50 feet or more.
Under such conditions, carry enough power to maintain nine to twelve degrees nose up
attitude, and 10 to 20 percent over stalling speed until contact is made with the water.
The proper use of power on the approach is of great importance. If power is available on
one side only, a little power should be used to flatten the approach; however, the engine
should not be used to such an extent that the aircraft cannot be turned against the good
engines right down to the stall with a margin of rudder movement available. When near the
stall, sudden application of excessive unbalanced power may result in loss of directional
control. If power is available on one side only, a slightly higher than normal glide
approach speed should be used. This will insure good control and some margin of speed
after leveling off without excessive use of power. The use of power in ditching is so
important that when it is certain that the coast cannot be reached, the pilot should, if
possible, ditch before fuel is exhausted. The use of power in a night or instrument
ditching is far more essential than under daylight contact conditions.
1. If no power is available, a greater than normal approach speed
should be used down to the flare-out. This speed margin will allow the glide to be broken
early and more gradually, thereby giving the pilot time and distance to feel for the
surface- decreasing the possibility of stalling high or flying into the water. When
landing parallel to a swell system, little difference is noted between landing on top of a
crest or in the trough. If the wings of aircraft are trimmed to the surface of the sea
rather than the horizon, there is little need to worry about a wing hitting a swell crest.
The actual slope of a swell is very gradual. If forced to land into a swell, touchdown
should be made just after passage of the crest. If contact is made on the face of the
swell, the aircraft may be swamped or thrown violently into the air, dropping heavily into
the next swell. If control surfaces remain intact, the pilot should attempt to maintain
the proper nose above the horizon attitude by rapid and positive use of the controls.
f. After Touchdown. In most cases drift, caused by crosswind can be
ignored; the forces acting on the aircraft after touchdown are of such magnitude that
drift will be only a secondary consideration. If the aircraft is under good control, the
"crab" may be kicked out with rudder just prior to touchdown. This is more
important with high wing aircraft, for they are laterally unstable on the water in a
crosswind and may roll to the side in ditching.
REFERENCE-
This information has been extracted from Appendix H of the "National Search and
Rescue Manual."
6-3-4. Special Emergency (Air Piracy)
a. A special emergency is a condition of air piracy, or other
hostile act by a person(s) aboard an aircraft, which threatens the safety of the aircraft
or its passengers.
b. The pilot of an aircraft reporting a special emergency condition
should:
1. If circumstances permit, apply distress or urgency
radio-telephony procedures. Include the details of the special emergency.
REFERENCE-
AIM, Distress and Urgency Communications, Paragraph 6-3-1.
2. If circumstances do not permit the use of prescribed distress
or urgency procedures, transmit:
(a) On the air/ground frequency in use at the time.
(b) As many as possible of the following elements spoken distinctly
and in the following order:
(1) Name of the station addressed (time and circumstances
permitting).
(2) The identification of the aircraft and present position.
(3) The nature of the special emergency condition and pilot
intentions (circumstances permitting).
(4) If unable to provide this information, use code words and/or
transponder as follows: state "TRANSPONDER SEVEN FIVE ZERO ZERO." Meaning:
"I am being hijacked/forced to a new destination;" and/or use Transponder
Setting MODE 3/A, Code 7500.
NOTE-
Code 7500 will never be assigned by ATC without prior notification from the pilot that the
aircraft is being subjected to unlawful interference. The pilot should refuse the
assignment of Code 7500 in any other situation and inform the controller accordingly. Code
7500 will trigger the special emergency indicator in all radar ATC facilities.
c. Air traffic controllers will acknowledge and confirm receipt of
transponder Code 7500 by asking the pilot to verify it. If the aircraft is not being
subjected to unlawful interference, the pilot should respond to the query by broadcasting
in the clear that the aircraft is not being subjected to unlawful interference. Upon
receipt of this information, the controller will request the pilot to verify the code
selection depicted in the code selector windows in the transponder control panel and
change the code to the appropriate setting. If the pilot replies in the affirmative or
does not reply, the controller will not ask further questions but will flight follow,
respond to pilot requests and notify appropriate authorities.
d. If it is possible to do so without jeopardizing the safety of
the flight, the pilot of a hijacked passenger aircraft, after departing from the cleared
routing over which the aircraft was operating, will attempt to do one or more of the
following things, insofar as circumstances may permit:
1. Maintain a true airspeed of no more than 400 knots, and
preferably an altitude of between 10,000 and 25,000 feet.
2. Fly a course toward the destination which the hijacker has
announced.
e. If these procedures result in either radio contact or air
intercept, the pilot will attempt to comply with any instructions received which may
direct the aircraft to an appropriate landing field.
6-3-5. Fuel Dumping
a. Should it become necessary to dump fuel, the pilot should
immediately advise ATC. Upon receipt of information that an aircraft will dump fuel, ATC
will broadcast or cause to be broadcast immediately and every 3 minutes thereafter the
following on appropriate ATC and FSS radio frequencies:
EXAMPLE-
Attention all aircraft-fuel dumping in progress over-(location) at (altitude) by (type
aircraft) (flight direction).
b. Upon receipt of such a broadcast, pilots of aircraft affected,
which are not on IFR flight plans or special VFR clearances, should clear the area
specified in the advisory. Aircraft on IFR flight plans or special VFR clearances will be
provided specific separation by ATC. At the termination of the fuel dumping operation,
pilots should advise ATC. Upon receipt of such information, ATC will issue, on the
appropriate frequencies, the following:
EXAMPLE-
ATTENTION ALL AIRCRAFT-FUEL DUMPING BY-(type aircraft)-TERMINATED.
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