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(620 mb);
b) the crew and passengers for any period that the atmospheric pressure in compartments occupied
by them will be less than 620 hPa (620 mb).
4.3.8.2 A flight to be operated with a pressurized aeroplane shall not be commenced unless a
sufficient quantity of stored breathing oxygen is carried to supply all the crew members and a
proportion of the passengers, as is appropriate to the circumstances of the flight being undertaken,
in the event of loss of pressurization, for any period that the atmospheric pressure in any
compartment occupied by them would be less than 700 hPa (700 mb).
Annex 6, Part I, further specifies in 4.4.5.1 that all flight crew members shall use breathing oxygen
continuously whenever circumstances prevail as specified in 4.3.8.1 and 4.3.8.2 above. Paragraph 4.4.5.2
specifies:
4.4.5.2 All flight crew members of pressurized aeroplanes operating above an altitude where the
atmospheric pressure is less than 376 hPa (376 mb) shall have available at the flight duty station a
quick donning type of oxygen mask which will readily supply oxygen upon demand.
Recommendation 4.4.6 of Annex 6 details procedures to ensure the safety of cabin attendants and
passengers in pressurized aircraft in the event of pressurization loss.
DEFINITIONS
The following is a selection of definitions pertinent to the responsibilities of an aviation medical
examiner. Definitions of terms used in the SARPs and which are not self-explanatory are provided in each
Annex. A definition does not have independent status but is an essential part of each Standard or
Recommended Practice in which the defined term is used, since a change in the meaning of the term
would affect the specification. When the following terms (from Annexes 1, 2 and 6) are used in the
SARPs they have the following meaning:
Accredited medical conclusion. The conclusion reached by one or more medical experts
acceptable to the Licensing Authority for the purposes of the case concerned, in consultation with
flight operations or other experts as necessary.
Co-pilot. A licensed pilot serving in any piloting capacity other than as pilot-in-command but
excluding a pilot who is on board the aircraft for the sole purpose of receiving flight instruction.
Crew member. A person assigned by an operator to duty on an aircraft during flight time.
Flight crew member. A licensed crew member charged with duties essential to the operation of
an aircraft during flight time.
Flight duty period. The total time from the moment a flight crew member commences duty,
immediately subsequent to a rest period and prior to making a flight or a series of flights, to the
moment he is relieved of all duties having completed such flight or series of flights.
Flight time — aeroplanes. The total time from the moment an aeroplane first moves for the
purpose of taking off until the moment it finally comes to rest at the end of the flight.
Note. — Flight time as here defined is synonymous with the term “block to block” time or
“chock to chock” time in general usage which is measured from the time an aeroplane first
moves for the purpose of taking off until it finally stops at the end of the flight.
Flight time — helicopters. The total time from the moment a helicopter’s rotor blades start
turning until the moment the helicopter finally comes to rest at the end of the flight, and the rotor
blades are stopped.
General aviation. All civil aviation operations other than scheduled air services and
non-scheduled air transport operations for remuneration or hire.
Human performance. Human capabilities and limitations which have an impact on the safety and
efficiency of aeronautical operations.
Licensing Authority. The authority designated by a Contracting State as responsible for the
licensing of personnel.
Note.— In the provisions of this Annex, the Licensing Authority is deemed to have been given
the following responsibilities by the Contracting State:
a) assessment of an applicant’s qualifications to hold a licence or rating;
b) issue and endorsement of licences and ratings;
c) designation and authorization of approved persons;
d) approval of training courses;
e) approval of the use of synthetic flight trainers and authorization for their use in gaining the
experience or in demonstrating the skill required for the issue of a licence or rating; and
f) validation of licences issued by other Contracting States.
Likely. In the context of the medical provisions in Chapter 6, likely means with a probability of
occurring that is unacceptable to the Medical Assessor.
Medical Assessment. The evidence issued by a Contracting State that the licence holder meets
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Manual of Civil Aviation Medicine 1(14)
