Chapter 2 Introduction to CAP 697

Flight Planning 2-2

DEFINITIONS Most of the following definitions are used in ICAO and JAA documentation. Some definitions are common use and are not used in the relevant ICAO or JAA documentation but still need to be known.

Definition Meaning

Basic Empty Mass (Basic Mass) The mass of an aeroplane plus standard items such as:

i. Unusable fuel and other unusable fluids ii. Lubricating oil in engine and auxiliary

units iii. Fire extinguishers iv. Pyrotechnics v. Emergency oxygen equipment vi. Supplementary electronic equipment

Dry Operating Mass (DOM) The total mass of the aeroplane ready for a specific type of operation excluding all usable fuel and traffic load. The mass includes items such as:

i. Crew and crew baggage ii. Catering and removable passenger

service equipment iii. Potable water and lavatory chemicals iv. Food and beverages

Operating Mass (OM) The DOM plus fuel but without traffic load

Traffic Load The total mass of: i. Passengers ii. Baggage iii. Cargo

Including any non-revenue load

Zero Fuel Mass The DOM plus traffic load but excluding fuel

Maximum Zero Fuel Mass (MZFM) The maximum permissible mass of an aeroplane with no usable fuel.

Taxi Mass The mass of the aircraft at the start of the taxi (at departure from the loading gate).

Maximum Structural Taxi Mass The structural limitation on the mass of the aeroplane at the commencement of taxi.

Take-Off Mass (TOM) The mass of an aeroplane including everything and everyone contained within it at the start of the take-off run.

Performance Limited Take-Off Mass The take-off mass subject to departure airfield limitations. It must never exceed the maximum structural limit.

Regulated TOM The lowest of performance limited and structural limited TOM.

Introduction to CAP 697 Chapter 2

Flight Planning 2-3

Definition Meaning

Maximum Structural Take-Off Mass The maximum permissible total aeroplane mass at the start of the take-off run.

Performance Limited Landing mass The mass subject to the destination airfield limitations. It must never exceed the structural limit.

Maximum Structural Landing Mass The maximum permissible total aeroplane mass on landing under normal circumstances.

Regulated Landing Mass The lowest of performance limited and structural limited landing mass.

Note: The term weight is considered as having the same meaning as the term mass. CONVERSIONS The following conversions are taken from the ICAO Annex, they also appear on page 3 of CAP 697.

Mass Conversion Pounds (LB) to Kilograms (KG) LB x 0.45359237 KG Kilograms (KG) to Pounds (LB) KG x 2.20462262 LB Volumes (Liquid)

Imperial Gallons to Litres (L) Imp Gall x 4.546092 US Gallons to Litres (L) US Gall x 3.785412 Lengths

Feet (ft) to Metres (m) Feet x 0.3048 Distances

Nautical Mile (NM) to metres (m) NM x 1852