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1. Alerting Service and Overdue Aircraft

Welcome to E10 — Unusual, Degraded and Emergency Situations

Scenario — A routine arrival becomes overdue

Alerting service turns concern into organised assistance

By the end of this part, you will be able to…

Use one response loop throughout Part 1

Alert phases describe growing concern - not automatic fixed waiting periods

Uncertainty is different from confirmed immediate danger

INCERFA, ALERFA and DETRESFA organise escalating concern

Build the overdue-aircraft response in a disciplined order

The timeline begins with controlled flight information

Communications checks gather evidence; notification starts organised action

Activity 1 - Construct an overdue-aircraft timeline

Debrief - time, evidence and escalation must agree

Checkpoint — What does each alert phase describe

Checkpoint — Why are negative communications checks recorded

Checkpoint — Which flight information supports an overdue-aircraft assessment

2. Emergency Communication and Support

Emergency communication gives the most important information first

Distress and urgency require different priority but the same discipline

A usable emergency message builds a common operational picture

Handle an emergency call without losing the sequence

Prioritise information by immediate operational value

Support the response organisation without taking over its command

Close the emergency notification cascade

Activity 2 - Build an emergency message cascade

Debrief - protect the channel and close every notification

Accident, incident and fire reports need immediate factual separation

Disabled aircraft can create three simultaneous problems

Medical emergencies and precautionary landings still require verified support

Activity 3 - Manage a developing aircraft emergency

Debrief - support, inform and preserve - do not assume command

Checkpoint — What has absolute communications priority

Checkpoint — Which emergency facts have immediate operational value

Checkpoint — How is a notification loop closed

Recognise early. Notify accurately. Support without overreach.

3. Communication, Power and Facility Failure

Part 2 — Degraded operations, contingency and recovery

Scenario — Several defences fail together

Degraded operation begins when capability no longer matches the normal assumption

Use one degraded-operations loop

Classify degradation before choosing the response

Transmitter and receiver failures create different evidence

Recover communication through approved layers

Alternative communication must preserve identity, meaning and authority

Power failure affects more than the light switch

A lighting failure must be described as capability and uncertainty

Activity 1 - Run the radio and facility-failure board

Debrief - make the reduced capability visible

Checkpoint — How do transmitter and receiver failures differ

Checkpoint — What must an alternative communications channel preserve

Checkpoint — Which systems may depend on electrical power

4. Contingency Operations

Severe weather changes both the aerodrome picture and the service capability

A runway obstruction requires three linked decisions

Closure information and aircraft decisions remain separate

Move from severe weather warning to sustained operation

Evacuation changes people, access, communications and service status at once

Control continuity and recovery as separate phases

Activity 2 - Manage severe weather and runway obstruction

Debrief - stabilise the service before attempting normality

5. Security, Evidence and Recovery

Security-sensitive events demand urgent action and controlled disclosure

Unlawful interference and bomb threats require disciplined role boundaries

Preserve evidence across three connected records

Close the event without losing the learning

Activity 3 - Resolve an integrated multi-failure scenario

Debrief - one event needs one shared, traceable picture

Checkpoint — What changes when severe weather also degrades facilities

Checkpoint — Who retains aircraft operating decisions when runway-closure information is passed

Checkpoint — How should security-sensitive details be handled

Detect the loss. Stabilise the service. Recover with evidence.

Build disciplined AFIS responses to overdue aircraft, emergencies, degraded communications and facilities, severe weather, security-sensitive events and the controlled return to normal service.

E10 — Unusual, Degraded and Emergency Situations

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