27. Alerting Service - ATM1

Question 1

Define Alerting Service

Answer 1

A service provided to notify appropriate organisations regarding aircraft in need of SAR aid and assist such organisations as required.

Question 2

When shall Alerting Service be provided?

Answer 2

• All aircraft provided with ATC service
• To all other aircraft having filed a flight plan or otherwise known to the air traffic services
• To any aircraft known or believed to be the subject of unlawful interference

Question 3

3 possible phases of Emergency

Answer 3

Uncertainty Phase – INCERFA
Alert Phase – ALERFA
Distress Phase – DETRESFA

Question 4

What is INCERFA?

Answer 4

Uncertainty Phase – INCERFA
A situation wherein uncertainty exists as to the
safety of an aircraft and its occupants.
- Commences

1: Earliest of no comms from/to aircraft 30 mins after:
a: time should have been received, or
b: first time unable to contact, or
2: Aircraft fails to arrive within 30 minutes of last notified ETA or estimated by ATSUs, whichever is later.

Except;
No doubt exists as to safety of aircraft
and occupants

Question 5

What is ALERFA?

Answer 5

Alert Phase – ALERFA
A situation wherein apprehension exists as to
the safety of an aircraft and its occupants.

-Commences
1: After Uncertainty phase, further attempts
to establish comms or further inquiries fail to
reveal news, or
2: Aircraft cleared to land fails to land within 5
mins of landing estimate and comms not
regained, or
3: Information received indicating operating
efficiency of aircraft impaired, but not to
extent forced landing likely, or
4: Aircraft known or believed to be subject of
unlawful interference.

Except;
Evidence exists allaying apprehension to the
safety of aircraft an

Question 6

What is DETRESFA?

Answer 6

Distress Phase – DETRESFA
A situation wherein there is reasonable
certainty that an aircraft and its occupants are
threatened by grave and imminent danger or
require immediate assistance.

• Commences
  1: After alert phase, further attempts to
  establish comms more widespread inquiries
  point to the probability the aircraft is in
  distress, or
  2: Fuel on board considered exhausted or
  insufficient for aircraft to reach safety, or
  3: Info received indicating operating
  efficiency of aircraft impaired and a forced
  landing is likely, or
  4: Info received or reasonably certain aircraft
  has or is about to make a forced landing

Except;
Reasonably certain aircraft and occupants are
not threatened by grave and imminent danger
and do not require immediate assistance

Question 7

Define Distress

Answer 7

A condition of being threatened by serious
and/or imminent danger and of requiring
immediate assistance.

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Question 8

Define Urgency

Answer 8

A condition concerning the safety of an aircraft
or other vehicle, or of some person on board or
within sight, but which does not require
immediate assistance.

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