Fiche de révision : Aviation Safety and Operations Fundamentals

📋 Course Outline

1. Aviation communication and measurement units
2. Aircraft structures and propulsion
3. Aerodynamics and meteorology
4. Emergency procedures and cabin duties
5. Cabin crew type-specific training
6. Refresher training and crew readiness

📖 1. Aviation communication and measurement units

🔑 Key Concepts & Definitions

• Aviation phonetic alphabet : The aviation phonetic alphabet is a radio communication code using specific words to represent letters and reduce confusion in noisy conditions.
• Measurement units in aviation : Measurement units in aviation are chosen for aviation operations, with common use of feet, nautical miles, knots, Mach, and hectopascals for altitude, distance, speed, Mach number, and pressure.

📝 Essential Points

• Aviation phonetic alphabet letters use words from Alpha to Zulu to spell messages clearly letter by letter over radio.
• Pressure is measured as force per surface area, and the hectopascal is the main aviation unit in meteorology, with standard pressure 1013.25 hPa.
• Pressure altitude is the indicated altitude when the altimeter is set to 1013 hPa (29.92 inHg).
• One nautical mile equals 1,852 kilometers, and one knot is one nautical mile per hour (1.852 km/h).

💡 Memory Hook

Letters sound clearer: use Alpha-Zulu words to spell what you can’t safely hear.

📖 2. Aircraft structures and propulsion

🔑 Key Concepts & Definitions

• Airframe : The airframe is the aircraft’s main structural set of components that includes the wing, fuselage, landing gear, and tail surfaces.
• Control surfaces : Control surfaces are moveable parts on an aircraft that change its motion about the principal axes (roll, pitch, yaw).
• Turbojet and turboprop : Turbojet and turboprop describe two engine types where turbojet thrust comes from exhaust gas and turboprop thrust drives a propeller.

📝 Essential Points

• In straight, level, constant-speed flight with no turning moments, equilibrium requires thrust equals drag and weight equals lift.
• Aircraft changes attitude by turning about three axes: longitudinal for roll (ailerons), lateral for pitch (elevators), and vertical for yaw (rudder).
• A turbojet sends 100% of intake air through the engine core, while a turboprop is optimized to drive a propeller and is especially efficient at speeds below Mach 0.6.

📖 3. Aerodynamics and meteorology

🔑 Key Concepts & Definitions

• QNH : QNH is the reported atmospheric pressure used in aviation to represent the total weight of the air column above the measurement point.
• Standard atmosphere : Standard atmosphere is a reference set of typical values for pressure, temperature, and temperature change with height.
• Cumulonimbus Cb : Cumulonimbus (Cb) is a dense, tall thundercloud that can produce severe turbulence, icing, electrical disturbances, and harmful precipitation.

📝 Essential Points

• QNH represents the total weight of the air column above the point where pressure is measured and is about 1 kg/cm² (≈10 tons/m²).
• Standard atmosphere values: sea-level pressure 1013.25 hPa, sea-level temperature 15 °C, and a temperature gradient of 2 °C/1000 ft (6.5 °C/1000 m).
• Clear Air Turbulence (CAT) typically occurs outside clouds at altitudes above 15,000 feet MSL due to strong wind shear in the jet stream.
• A mature Cb can have vertical air movement up to 50 kt and is associated with severe turbulence from strong updrafts and downdrafts.

💡 Memory Hook

QNH = “weight of air column” above your position.

📖 4. Emergency procedures and cabin duties

🔑 Key Concepts & Definitions

• Emergency phases reporting : Emergency phases guide how the cabin crew and cockpit communicate abnormal situations and decide whether evacuation steps are needed.
• Brace for impact : Brace for impact is the protective action cabin crew shout and coordinate when impact is imminent and no preparation time exists.
• Evacuation directives : Evacuation directives are the cabin-floor commands and door drill actions used to control evacuation when it becomes necessary.

📝 Essential Points

• Cabin crew must inform the Purser immediately when they observe smoke, fire, unusual sounds/fumes, or other abnormal situations during any flight phase.
• If no time exists for preparations and the command BRACE FOR IMPACT is given, cabin crew shout it repeatedly until the aircraft has come to a complete stop.
• When time is available for an emergency landing, the Purser coordinates with the flight crew via cockpit call/crew call lights and then instructs cabin crew using the Preparation Directive.
• For decompression, cabin crew must demonstratively don the nearest oxygen mask, sit down as emergency descent follows, and then assist passengers to put on masks from overhead containers when commanded.

💡 Memory Hook

PAN for alert, MAY DAY for distress; if you hear BRACE FOR IMPACT, your job is loud protection until stop.

📖 5. Cabin crew type-specific training

🔑 Key Concepts & Definitions

• Aircraft type specific training : Aircraft type specific training is the hands-on instruction for each cabin crew member on the specific aircraft type relevant safety systems, equipment, and door/exit duties for that type.
• Operator conversion training : Operator conversion training adapts cabin crew instruction to the operator’s specific cabin configuration and standard operating procedures for the aircraft type being operated.
• Differences training : Differences training is the additional instruction and practice needed when a cabin crew member moves to an aircraft variant or type/variant with different safety equipment, equipment locations, or procedures.

📝 Essential Points

• Each cabin crew member must complete aircraft type specific training and operator conversion training before being first assigned or before being assigned to another aircraft type by the operator.
• Aircraft type specific training must involve training/practice on a representative device or the actual aircraft and must include door/exit operation by each crew member in normal and emergency modes.
• Differences training must be completed before assignment on an aircraft variant or a currently operated type/variant with different safety equipment, safety/emergency equipment location, or normal/emergency procedures.
• Familiarisation flights/visits are used to build type familiarity for CAT operations and are recorded in the cabin crew member’s training record.

💡 Memory Hook

Type training = learn the plane; Operator conversion = learn the company’s way; Differences = learn what changed.

📖 6. Refresher training and crew readiness

🔑 Key Concepts & Definitions

• Refresher training : Refresher training is recurrent training a cabin crew member must complete to be reassigned to flying duties when recency requirements are not met.
• Mental and physical fitness : Mental and physical fitness is the requirement that cabin crew must be free of illness that could incapacitate them or prevent safe cabin duties.
• Window of Circadian Low replacement : Recurrent training is an allowed substitute for refresher training only when reinstatement of flying duties begins within the validity period of the last recurrent training and checking.

📝 Essential Points

• Refresher training and checking must be completed before reassignment if, within the preceding 6 months, the cabin crew member had not performed flying duties, or if they missed flying duties on one particular aircraft type and must resume on that type.
• The refresher programme for each aircraft type must at least cover emergency procedures, evacuation procedures, door/exit and flight crew security door opening (normal and emergency modes), and location/handling of relevant safety and emergency equipment.
• No alcohol may be consumed less than 8 hours before the specified reporting time, and blood alcohol must not exceed 0.2 per thousand at the start of the flight duty period.
• Non-decompression scuba diving is not allowed within 24 hours before the flight, and at least 24 hours should pass after normal blood donation before returning to flying duties.

💡 Memory Hook

6-month trigger + 8-hour alcohol rule + 24-hour diving/blood wait = “recency + sobriety + recovery” for readiness.

📅 Key Dates

📊 Synthesis Tables

Key cabin tasks across major phases

⚠️ Common Pitfalls & Confusions

1. Confusing pressure altitude with QNH: pressure altitude uses an altimeter setting of 1013 hPa, while QNH is reported atmospheric pressure representing the total weight of the air column above the measuring point.
2. Mixing knots and nautical miles: a knot is a nautical mile per hour (1.852 km/h), not a length unit.
3. Assuming CAT happens in clouds: CAT is described as occurring outside clouds above 15,000 feet MSL due to jet stream wind shear.
4. Misunderstanding BRACE FOR IMPACT timing: the manual requires repeated shouting when the command is given suddenly with no preparation time, and during the “Attention Crew at Stations” call just before landing.
5. Swapping training types: aircraft type specific training includes door/exit operation by each crew member in normal and emergency modes, while differences training targets only what changed on a variant or current variant/type.
6. Thinking exit row seats can be taken by anyone: exit row seats may only be occupied by able-bodied passengers (ABP) and not PRM, infants/children under 12, or incapacitated passengers.
7. Using oxygen procedures incorrectly: for decompression cabin crew must demonstratively don the nearest oxygen mask and then assist passengers when commanded, not inflate personal equipment early without instruction.

✅ Exam Checklist

1. Spell the aviation phonetic alphabet letters from Alpha to Zulu and apply it correctly letter-by-letter over radio.
2. Convert and define aviation measurement units: foot for altitude, nautical mile (1 Nm = 1,852 kilometers), knot (nautical mile per hour), Mach as speed/sound speed ratio, and hectopascal with standard pressure 1013.25 hPa.
3. State the basic flight equilibrium and the four forces in flight: THRUST = DRAG and WEIGHT = LIFT.
4. Identify the three aircraft axes and the associated primary control surfaces: longitudinal/ailerons (roll), lateral/elevators (pitch), vertical/rudder (yaw).
5. Describe aircraft airframe contents (wing, fuselage, landing gear, horizontal stabilizer and drift) and distinguish turbojet vs turboprop thrust and the turboprop efficiency below Mach 0.6.
6. Recall meteorology definitions and effects: QNH as “total weight of the column of air above the point,” standard atmosphere temperature/gradient, and cumulonimbus Cb hazards including vertical movement up to 50 kt.
7. Explain turbulence and cloud safety points: CAT occurs outside clouds above 15,000 feet MSL, and a mature Cb can produce severe turbulence, icing, electrical disturbance, and harmful precipitation.
8. Emergency alerting and phases: recognize PAN PAN (alert) vs MAY DAY (distress) and the emergency phase logic (INCERFA, ALERFA, DETRESFA) as described.
9. Evacuation initiation and “no time available” defense: if BRACE FOR IMPACT is given suddenly, cabin crew must repeatedly shout it until complete stop; otherwise follow “EVACUATE, EVACUATE, EVACUATE”/evacuation signal and door drill basics.
10. Training and readiness requirements: for CAT operations ensure aircraft type specific training + operator conversion training + differences training are completed as required before assignment, and refresher training triggers and minimum recurrent coverage are met when recency is not maintained.
11. Cabin crew readiness constraints: apply the 8-hour alcohol restriction and blood alcohol limit 0.2 per thousand at start of flight duty period, and respect the 24-hour non-decompression scuba diving and 24-hour (normal) blood donation waiting rules.