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THE HONG KONG GOVERNMENT GAZETTE, JANUARY 15, 1932.
(b) The maximum total weight authorised for it, as shown for the time being in
its certificate of airworthiness,
and shall carry displayed in a prominent position inside it a weight schedule showing what items of equipment (if any) are included in the "weight empty (including water in the radiators)" as painted on it.
MODIFICATIONS SUBSEQUENT TO THE ISSUE OF CERTIFICATE.
23.--(1) If at any time the Governor or the Secretary of State for Air consider modifications to an aircraft, in respect of which a certificate of airworthiness is in force, to be necessary for safety, the Governor may require such modifications to be carried out as a condition of the certificate of airworthiness remaining in force.
(2) The owner of an aircraft in respect of which a certificate of airworthiness is in force, shall not carry out any modifications (including changes of equipment or its installation) which affect the safety of the aircraft without first obtaining the approval of the Director of Air Services.
(3) The Director of Air Services may, in case of modifications affecting the structure of the aircraft, the engine, or the installations, or any modifications affecting the naviga- tion of, or the pilot's view while navigating the aircraft, require, in respect of the aircraft proposed to be so modified, the submission of an application for a new certificate of airworthiness. Pending a decision on this application, the aircraft in question may only be flown in its unmodified state.
CLASSIFICATION OF FLYING MACHINES.
24. A certificate of airworthiness will only be issued for the appropriate category and subdivision of the aircraft as is provided in paragraph 25, and in the case of valida- tion or renewal, the category and subdivision for which the original certificate of airworthiness was issued will be adhered to.
25. The following are the categories and subdivisions under which flying machines are classified :
(1) Normal category :
Subdivision (a); Public transport machines for passengers.
Subdivision (b); Public transport machines for mails.
Subdivision (c); Public transport machines for goods.
*
'Public transport machines are defined as those which may be used for
flight with passengers, mails, or goods, for remuneration.
Subdivision (d); Private machines. "Private machines" are defined as those which (i) are the property of an aeroplane club, or (ii) may be used for purposes other than either the carriage of passengers, mails, or goods for remuneration or any other industrial purpose:
Subdivision (e); Aerial work machines.
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Aerial work machines are defined as those which may be used for industrial purposes not included in the defini- tion of public transport machines. (These purposes, which may depend on the incorporation of special structural features or equipment, may be limited by the certificate of airworthiness).
(2) Special category:
Subdivision (f); Racing or record machines. "Racing or record machines" are defined as those which are specially intended or arranged for the purpose of sporting or technical performances, to the exclusion of any other use. Subdivision (g); Research or experimental machines. "Research or experi- mental machines " are defined as those which are specially intended or arranged for the purpose of experimenting in flight with regard to new apparatus and checking the results thereof, to the exclusion of
other use. any
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