5. The scales of equipment indicated in the foregoing Table shall be as follows:
Scale A
Spare fuses for all electrical circuits the fuses of which can be replaced in flight, consisting of 10 per cent, of the number of each rating or three of each rating, whichever is the greater;
Maps, charts, codes and other documents and navigational equipment necessary, in addition to any other equipment required under this Order, for the intended flight of the aircraft, including any diversion which may reasonably be expected.
Subject to Scale B(iii)(a), in all aeroplanes, helicopters and gyroplanes for every pilot’s seat and for any seat situated alongside a pilot’s seat, a safety belt with one diagonal shoulder strap or a safety harness:
Provided that the Governor may permit a safety belt without a diagonal shoulder strap to be fitted if he is satisfied that it is not reasonably practicable to fit a safety belt with one diagonal shoulder strap, or a safety harness.
Subject to Scale B(iii)(b) for every seat in use (not being a seat referred to in sub-paragraph (a) above) a safety belt with or without one diagonal shoulder strap or a safety harness.
In addition and for attachment to the equipment required in sub-paragraph (b) above, a child restraint device for every child under the age of two years on board.
Scale B
First-aid equipment of good quality, sufficient in quantity, having regard to the number of persons on board the aircraft, and including the following:
Roller bandages, triangular bandages, adhesive plaster, absorbent gauze, cotton wool (or wound dressings in place of the absorbent gauze and cotton wool), burn dressings, safety pins;
Haemostatic bandages or tourniquets, scissors;
Antiseptic, analgesic and stimulant drugs;
Splints, in the case of aeroplanes the maximum total weight authorised of which exceeds 5,700 kg;
A handbook on First Aid.
In the case of a flying machine used for the public transport of passengers in which, while the flying machine is at rest on the ground, the sill of an external door intended for the disembarkation of passengers, whether normally or in an emergency.
is more than 1.82 metres from the ground when the undercarriage of the machine is in the normal position for taxying, or
would be more than 1.82 metres from the ground if the undercarriage or any part thereof should collapse, break or fail to function.
apparatus readily available for use at each such door consisting of a device or devices which will enable passengers to reach the ground safely in an emergency while the flying machine is on the ground, and can be readily fixed in position for use.
If the maximum total weight authorised of the aircraft exceeds 2,730 kg, a safety harness for every pilot’s seat in use, in place of the safety belt with one diagonal shoulder strap referred to under Scale A:
Provided that the Governor may permit a safety belt with one diagonal shoulder strap to be fitted if he is satisfied that it is not reasonably practicable to fit a safety harness.
On all flights for the public transport of passengers by aircraft, for each seat for use by cabin attendants who are required to be carried under this Order, a safety harness.
If the commander cannot, from his own seat, see all the passengers' seats in the aircraft, a means of indicating to the passengers that seat belts should be fastened.
Scale C
Equipment for displaying the lights required by the Rules of the Air and Air Traffic Control;
Electrical equipment, supplied from the main source of supply in the aircraft, to provide sufficient illumination to enable the flight crew properly to carry out their duties during flight;
Unless the aircraft is equipped with radio, devices for making the visual signal specified in the Rules of the Air and Air Traffic Control as indicating a request for permission to land.
Scale D
In the case of a helicopter or a gyroplane, a slip indicator;
In the case of any other flying machine either—
a turn indicator and a slip indicator; or
a gyroscopic bank and pitch indicator and a gyroscopic direction indicator,
a sensitive pressure altimeter adjustable for any sea level barometric pressure which the weather report or forecasts available to the commander of the aircraft indicate is likely to be encountered during the intended flight.
Scale E
In the case of a helicopter or a gyroplane, a slip indicator;
In the case of any other flying machine, a turn indicator and a slip indicator;
A gyroscopic bank and pitch indicator;
A gyroscopic direction indicator;
A sensitive pressure altimeter adjustable for any sea level barometric pressure which the weather report or forecasts available to the commander of the aircraft indicate is likely to be encountered during the intended flight;
Provided that any aircraft may, at the option of the operator, be equipped with an additional gyroscopic bank and pitch indicator in lieu of the turn indicator referred to in (i) of this Scale.
Scale EE
On all flights beginning on or after 1st January 1991, a radio altimeter with an audio voice warning operating below a preset height and a visual warning capable of operating at a height selectable by the pilot.
Scale F
A timepiece indicating the time in hours, minutes and seconds;
A means of indicating whether the power supply to the gyroscopic instruments is adequate;
A rate of climb and descent indicator;
If the maximum total weight authorised of the aircraft exceeds 5,700 kg. a means of indicating the outside air temperature;
If the maximum total weight authorised of the aircraft exceeds 5,700 kg. two air speed indicators.
Scale G
In the case of an aircraft other than a helicopter or gyroplane landing lights consisting of two single filament lamps, or one dual filament lamp with separately energised filaments;
An electric lighting system to provide illumination in every passenger compartment;
one electric torch for each member of the crew of the aircraft; or
one electric torch for each member of the flight crew of the aircraft; and
at least one electric torch affixed adjacent to each floor level exit intended for the disembarkation of passengers whether normally or in an emergency, provided that such torches shall:—
be readily accessible for use by the crew of the aircraft at all times; and
number in total not less than the minimum number of cabin attendants required to be carried with a full passenger complement;
In the case of an aircraft other than a helicopter or gyroplane of which the maximum total weight authorised exceeds 5,700 kg., means of observing the existence and build up of ice on the aircraft.
In the case of a helicopter or gyroplane in respect of which there is in force a certificate of airworthiness designating the helicopter or gyroplane as being of performance group A, either—
two landing lights both of which are adjustable so as to illuminate the ground in front and below the helicopter or gyroplane and one of which is adjustable so as to illuminate the ground on either side of the helicopter or gyroplane; or
one landing light or, if the maximum total weight authorised of the helicopter or gyroplane exceeds 5,700 kg., one dual filament landing light with separately energised filaments, or two single filament lights, each of which is adjustable so as to illuminate the ground in front and below the helicopter or gyroplane; and two parachute flares.
In the case of a helicopter or gyroplane in respect of which there is in force a certificate of airworthiness designating the helicopter or gyroplane as being of performance group B, either—
one landing light and two parachute flares; or
if the maximum total weight authorised of the helicopter or gyroplane exceeds 5,700 kg. either one dual filament landing light with separately energised filaments or two single filament landing lights; and two parachute flares.
Scale H
For each person on board, a lifejacket equipped with a whistle and waterproof torch:
Provided that lifejackets constructed and carried solely for use by children under three years of age need not be equipped with a whistle.
Scale HH
A survival suit for each member of the crew.
Scale I
Additional flotation equipment, capable of supporting one-fifth of the number of persons on board, and provided in a place of stowage accessible from outside the flying machine;
Parachute distress rocket signals capable of making, from the surface of the water, the pyrotechnical signal of distress specified in the Rules of the Air and Air Traffic Control and complying with Part III of Schedule 15 to the Merchant Shipping (Life-Saving Appliances) Regulations 1980(1);
A sea anchor and other equipment necessary to facilitate mooring, anchoring or manoeuvring the flying machine on water, appropriate to its size, weight and handling characteristics.
Scale J
In the case of a flying machine, other than a helicopter or gyroplane carrying 20 or more persons, liferafts sufficient to accommodate all persons on board;
In the case of a helicopter or gyroplane carrying 20 or more persons, a minimum of two liferafts sufficient together to accommodate all persons on board.
Each liferaft shall contain the following equipment:
means for maintaining buoyancy;
a sea anchor;
life lines, and means of attaching one liferaft to another;
paddles or other means of propulsion;
means of protecting the occupants from the elements;
a waterproof torch;
marine type pyrotechnical distress signals;
means of making sea water drinkable, unless the full quantity of fresh water is carried as specified in sub-paragraph (i);
for each 4 or proportion of 4 persons the liferaft is designed to carry:
100 grammes of glucose toffee tablets;
½ litre of fresh water in durable containers:
Provided that in any case in which it is not reasonably practicable to carry the quantity of water above specified, as large a quantity of fresh water as is reasonably practicable in the circumstances may be substituted. In no case however shall the quantity of water carried be less than is sufficient, when added to the amount of fresh water capable of being produced by means of the equipment specified in sub-paragraph (h), to provide one half litre of water for each 4 or proportion of 4 persons the liferaft is designed to carry.
first aid equipment.
Items (f) to (j) inclusive shall be contained in a pack.
The number of survival beacon radio apparatus carried when the aircraft is carrying the number of liferafts specified in column 1 of the following Table shall be not less than the number specified in, or calculated in accordance with, column 2:
| Column 1 | Column 2 |
|---|---|
| Not more than 8 liferafts. | 2 survival beacon radio apparatus. |
| For every additional 4 or proportion of 4 liferafts. | 1 additional survial beacon radio apparatus. |
In the case of a helicoper or gyroplane undertaking a flight on or after 1st January 1991, an emergency beacon which is automatically deployed and activated in the event of a crash.
Scale K1
PART I
In every flying machine which is provided with means for maintaining a pressure greater than 700 millibars throughout the flight in the flight crew compartment and in the compartments in which passengers are carried—
a supply of oxygen sufficient, in the event of failure to maintain such pressure, occurring in the circumstances specified in columns 1 and 2 of the Table set out in Part II of this Scale, for continuous use, during the periods specified in column 3 of the said Table, by the persons for whom oxygen is to be provided in accordance with column 4 of that Table, and
in addition, in every case where the flying machine flies above flight level 350, a supply of oxygen in a portable container sufficient for the simultaneous first aid treatment of two passengers,
together with suitable and sufficient apparatus to enable such persons to use the oxygen.
In any other flying machine—
a supply of oxygen sufficient for continuous use by all the crew, and if passengers are carried, by 10% of the number of passengers, for any period exceeding 30 minutes during which the flying machine flies above flight level 100 but not above flight level 130 except that on and after 1st January 1991 flight crews shall be supplied with oxygen sufficient for continuous use for any period during which the flying machine flies above flight level 100; and
a supply of oxygen sufficient for continuous use by all persons on board for the whole time during which the flying machine flies above flight level 130,
PART II
| Column 1 | Column 2 | Column 3 | Column 4 |
|---|---|---|---|
| Vertical displacement of the flying machine in relation to flight levels | Capability of flying machine to descend (where relevant) | Period of supply of oxygen | Persons for whom oxygen is to be provided |
A. The whole period during which, after a failure to maintain a pressure greater than 700 millibars in the control compartment and in the compartments in which passengers are carried has occurred, the flying machine flies above flight level 100. B. The whole period during which, after a failure to maintain such pressure has occurred, the flying machine flies above flight level 150. C. The whole period during which, after a failure to maintain such pressure has occurred, the flying machine flies above flight level 100, but not above flight level 150. X. The flying machine is capable, at the time when a failure to maintain such pressure occurs, of descending in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the operations manual relating to the aircraft, to flight level 150 within 6 minutes, and of continuing at or below that flight level to its place of intended destination or any other place at which a safe landing can be made. Y. The flying machine is capable, at the time when a failure to maintain such pressure occurs, of descending in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the operations manual relating to the aircraft, to flight level 150 within 4 minutes, and of continuing at or below that flight level to its place of intended destination or any other place at which a safe landing can be made. | |||
| Above flight level 100 | — | 30 minutes or the period specified at A hereunder whichever is the greater | In addition to any passengers for whom oxygen is provided as specified below, all the crew |
| Above flight level 100 but not above flight level 300 | { Flying machine is either flying at or below flight level 150 or is capable of descending and continuing to destination as specified at X hereunder | 30 minutes or the period specified at A hereunder whichever is the greater | 10% of number of passengers |
| { Flying machine is flying above flight level 150 and is not so capable | { 10 minutes or the period specified at B hereunder whichever is greater | All passengers | |
| and in addition | |||
| { 30 minutes or the period specified at C hereunder whichever is the greater | 10% of number of passengers | ||
| Above flight level 300 but not above flight level 350 | { Flying machine is capable of descending and continuing to destination as specified at Y hereunder | 30 minutes or the period specified at A hereunder whichever is the greater | 15% of number of passengers |
| { Flying machine is not so capable | 10 minutes or the period specified at B hereunder whichever is the greater | All passengers | |
| and in addition | |||
| { 30 minutes or the period specified at C hereunder whichever is the greater | 15% of number of passengers | ||
| Above flight level 350 | — | { 10 minutes or the period specified at B hereunder whichever is the greater | All pasengers |
| and in addition | |||
| { 30 minutes or the period specified at C hereunder whichever is the greater | 15% of number of passengers | ||
together with suitable and sufficient apparatus to enable such person to use the oxygen.
The quantity of oxygen required for the purpose of complying with paragraphs (i) and (ii) of this Part of this Scale shall be computed in accordance with the information and instructions relating thereto specified in the operations manual relating to the aircraft pursuant to item (vi) of Part A of Schedule 10 to this Order.
Scale K2
A supply of oxygen and the associated equipment to meet the requirements set out in Parts I and II of this scale. The duration for the purposes of this scale shall be:
that calculated in accordance with the operations manual prior to the commencement of the flight, being the period or periods which it is reasonably anticipated that the aircraft will be flown in the circumstances of the intended flight at a height where the said requirements apply and in calculating the said duration account shall be taken of:
in the case of pressurised aircraft, the possibility of depressurisation when flying above flight level 100,
the possibility of failure of one or more of the aircraft engines,
restrictions due to required minimum safe altitude,
fuel requirement, and
the performance of the aircraft; or
the period or periods during which the aircraft is actually flown in the circumstances specified in the said Parts;
whichever is the greater.
PART I
Unpressurised Aircraft
When flying at or below flight level 100:
Nil.
When flying above flight level 100 but not exceeding flight level 120:
| Supply for | Duration |
|---|---|
(a)Members of the flight crew | Any period during which the aircraft flies above flight level 100 |
(b)Cabin attendants and 10% of passengers | For any continuous period exceeding 30 minutes during which the aircraft flies above flight level 100 but not exceeding flight level 120, the duration shall be the period by which 30 minutes is exceeded |
When flying above flight level 120:
| Supply for | Duration |
|---|---|
(a)Members of the flight crew | Any period during which the aircraft flies above flight level 120 |
(b)Cabin attendants and all passengers | Any period during which the aircraft flies above flight level 120 |
PART II
Pressurised aircraft
When flying at or below flight level 100:
Nil.
When flying above flight level 100 but not exceeding flight level 250:
| Supply for | Duration |
|---|---|
(a)Members of the flight crew | 30 minutes or whenever the cabin pressure altitude exceeds 10,000 feet whichever is the greater |
(b)Cabin attendants and 10% of passengers | (aa)When the aircraft is capable of descending and continuing to its destination as specified at A hereunder, 30 minutes or whenever the cabin pressure altitude exceeds 10,000 feet, whichever is the greater (bb)When the aircraft is not so capable, whenever the cabin pressure altitude is greater than 10,000 feet, but does not exceed 12,000 feet |
(c)Cabin attendants and passengers | (aa)When the aircraft is capable of descending and continuing to its destination as specified at A hereunder, no requirement other than that at (ii)(b)(aa) of this part of this scale (bb)When the aircraft is not so capable and the cabin pressure altitude exceeds 12,000 feet, the duration shall be the period when the cabin pressure altitude exceeds 12,000 feet or 10 minutes, whichever is the greater |
When flying above flight level 250:
| Supply for | Duration |
|---|---|
A. The flying machine is capable, at the time when a failure to maintain cabin pressurisation occurs of descending in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the operations manual relating to the aircraft, to flight level 120 within 5 minutes and of continuing at or below that flight level to its place of intended destination or any other place at which a safe landing can be made. | |
(a)Members of the flight crew | 2 hours or whenever the cabin pressure altitude exceeds 10,000 feet, whichever is the greater |
(b)Cabin attendants | Whenever the cabin pressure altitude exceeds 10,000 feet, and a portable supply for 15 minutes |
(c)10% of passengers | Whenever the cabin pressure altitude exceeds 10,000 feet but does not exceed 12,000 feet |
(d)30% of passengers | Whenever the cabin pressure altitude exceeds 12,000 feet but does not exceed 15,000 feet |
(e)All passengers | If the cabin pressure altitude exceeds 15,000 feet, the duration shall be the period when the cabin pressure altitude exceeds 15,000 feet or 10 minutes, whichever is the greater |
(f)2% of passengers or 2 passengers, whichever the greater, being a supply of first aid oxygen which must be available for simultaneous first aid treatment of 2% or 2 passengers wherever they are seated in the aircraft | Whenever, after decompression, the cabin pressure altitude exceeds 8000 feet |
Scale L
Equipment to prevent the impairment through ice formation of the functioning of the controls, means of propulsion, lifting surfaces, windows or equipment of the aircraft so as to endanger the safety of the aircraft.
Scale M
Safety harness for every seat in use—
Provided that, in the case of an aircraft carrying out aerobatic manoeuvres consisting only of erect spinning, the Governor may permit a safety belt with one diagonal shoulder strap to be fitted if he is satisfied that such restraint is sufficient for the carrying out of erect spinning in that aircraft and that it is not reasonably practicable to fit a safety harness in that aircraft.
Scale N
An intercommunication system for use by all members of the flight crew and including microphones, not of a hand-held type, for use by the pilot and flight engineer (if any).
Scale O
A radar set capable of giving warning to the pilot in command of the aircraft and to the co-pilot of the presence of cumulo-nimbus clouds and other potentially hazardous weather conditions:
Provided that a flight may commence if the set is unserviceable or continue if the set becomes unserviceable thereafter:
so as to give the warning only to one pilot, so long as the aircraft is flying only to the place at which it first becomes reasonably practicable for the set to be repaired; or
when the weather report or forecasts available to the commander of the aircraft indicate that cumulo-nimbus clouds or other potentially hazardous weather conditions which can be detected by the set when in working order are unlikely to be encountered on the intended route or any planned diversion therefrom or the commander has satisfied himself that any such weather conditions will be encountered in daylight and can be seen and avoided, and the aircraft is in either case operated throughout the flight in accordance with any relevant instructions given in the operations manual.
Scale P
A flight data recorder which is capable of recording, by reference to a time-scale, the following data—
indicated air speed;
indicated altitude;
vertical acceleration;
magnetic heading;
pitch attitude, if the equipment provided in the aeroplane is of such a nature as to enable this item to be recorded;
engine power, if the equipment provided in the aeroplane is of such a nature as to enable this item to be recorded;
flap position;
roll attitude, if the equipment provided in the aeroplane is of such a nature as to enable this item to be recorded:
Provided that any aeroplane having a maximum total weight authorised not exceeding 11,400 kg. may be provided with:
a flight data recorder capable of recording the data described in sub-paragraphs (a) to (h) of this Scale; or
a 4 channel cockpit voice recorder.
In addition, a four channel cockpit voice recorder shall be provided:—
on all flights by turbine-powered aeroplanes having a maximum total weight authorised exceeding 27,000 kg.;
on all flights beginning on or after 1st January 1991 by turbine-powered aeroplanes having a maximum total weight authorised exceeding 11,400 kg.
The flight data recorder and cockpit voice recorder referred to above shall be so constructed that the record would be likely to be preserved in the event of an accident to the aeroplane.
Provided that an aeroplane shall not be required to carry the said equipment, if before take-off the equipment is found to be unserviceable, and the aircraft flies in accordance with arrangements approved by the Governor.
Scale Q
If the maximum total weight authorised of the flying machine exceeds 5,700 kg. and it was first registered, whether in the Territory or elsewhere, on or after 1st June 1965, a door between the flight crew compartment and any adjacent compartment to which passengers have access, which door shall be fitted with a lock or bolt capable of being worked from the flight crew compartment.
Scale R1
Equipment sufficient to protect the eyes, nose and mouth of the pilot in command of the aircraft from the effects of smoke and noxious gases for a period of not less than 15 minutes; and
Portable equipment sufficient to protect the eyes, nose and mouth of one other member of the crew of the aircraft from the effects of smoke and noxious gases for a period of not less than 8 minutes; and
Equipment sufficient to protect from the effects of smoke and noxious gases the eyes of all members of the flight crew of the aircraft whose eyes are not adequately protected by other equipment.
Scale R2
In respect of aeroplanes having a maximum total weight authorised exceeding 5700 kg, equipment sufficient to protect the eyes, nose and mouth of all members of the flight crew required to be carried by virtue of Article 18 of this Order for a period of not less than 15 minutes and, in addition, where the minimum flight crew required as aforesaid is more than 1 and a cabin attendant is not required to be carried by virtue of Article 18 of this Order, portable equipment sufficient to protect the eyes, nose and mouth of one member of the flight crew for a period of not less than 15 minutes.
In respect of aeroplanes having a maximum total weight authorised not exceeding 5700 kg, the equipment specified in (i)(a) of this Scale provided that in the case of such aeroplanes restricted by virtue of the operator’s operations manual to flight at or below flight level 250 and capable of descending as specified at A hereunder such equipment shall be sufficient to protect the eyes only.
In respect of aeroplanes having a maximum total weight authorised exceeding 5700 kg, portable equipment to protect the eyes, nose and mouth of all cabin attendants required to be carried by virtue of Article 18 of this Order for a period of not less than 15 minutes.
In respect of aeroplanes having a maximum total weight authorised not exceeding 5700 kg, the equipment specified in (ii)(a) of this Scale provided that this requirement shall not apply to such aeroplanes restricted by virtue of the operator’s operations manual to flight at or below flight level 250 and capable of descending as specified at A hereunder.
The aeroplane is capable of descending in accordance with the emergency descent procedure specified in the relevant flight manual and without flying below the minimum altitudes for safe flight specified in the operations manual relating to the aeroplane, to flight levy 100 within 4 minutes and of continuing at or below the flight level to its place of intended destination orb any other place at which a safe landing can be made.
Scale S
A flight recording system comprising:
in respect of aeroplanes having a maximum total weight authorised not exceeding 11,400 kg. either a 4 channel cockpit voice recorder or a flight data recorder capable of recording by reference to a time scale data from which the following information can be ascertained: the flight path of the aeroplane; the attitude of the aeroplane; and the basic lift, thrust and drag forces acting upon the aeroplane;
in respect of aeroplanes having a maximum total weight authorised exceeding 11,400 kg. but not exceeding 27,000 kg, a 4 channel cockpit voice recorder and a flight data recorder capable of recording by reference to a time scale data from which the information specified in paragraph (i) can be ascertained;
in respect of aeroplanes having a maximum total weight authorised exceeding 27,000 kg, a 4 channel cockpit voice recorder and a flight data recorder capable of recording by reference to a time scale data from which the following information can be established: the flight path of the aeroplane; the attitude of the aeroplane; the basic lift, thrust and drag forces acting upon the aeroplane; the selection of high lift devices (if any) and airbrakes (if any); the position of primary flying control and pitch trim surfaces; cockpit warnings relating to engine fire and engine shutdown, cabin pressurisation, presence of smoke and hydraulic/pneumatic power supply; outside air temperature; instrument landing system deviations; use made of automatic flight control system; radio altitude (if any); and the level of essential AC electricity supply;
in respect of helicopters on any flight beginning on or after 1st January 1991 and having a maximum total weight authorised exceeding 2,700 kg. or a seating capacity exceeding 9 passengers, a 4 channel cockpit voice recorder which has attached to it an under-water sonar location device.
The cockpit voice recorder or flight data recorder, as the case may be, shall be so constructed that the record would be likely to be preserved in the event of an accident.
Provided that an aircraft shall not be required to carry the said equipment, if before take-off the equipment is found to be unserviceable and the aircraft flies in accordance with arrangements approved by the Governor.
Scale T
An underwater sonar location device, except in respect of those helicopters which have a device attached to a cockpit voice recorder in accordance with Scale S.
Scale U
1 survival beacon radio apparatus;
marine type pyrotechnical distress signals;
for each 4 or proportion of 4 persons on board, 100 grammes of glucose toffee tablets;
for each 4 or proportion of 4 persons on board, one half litre or fresh water in durable containers;
first aid equipment.
Scale V
1 survival beacon radio apparatus;
marine type pyrotechnical distress signals;
for each 4 or proportion of 4 persons on board, 100 grammes of glucose toffee tablets;
for each 4 or proportion of 4 persons on board, one half litre of fresh water in durable containers;
first aid equipment;
for every 75 or proportion of 75 persons on board, 1 stove suitable for use with aircraft fuel;
1 cooking utensil, in which snow or ice can be melted;
2 snow shovels;
2 ice saws;
single or multiple sleeping-bags, sufficient for the use of one-third of all persons on board;
1 Arctic suit for each member of the crew of the aircraft.
Scale W
Cosmic radiation detection equipment calibrated in millirems per hour and capable of indicating the action and alert levels of radiation dose rate:
Provided that an aircraft shall not be required to carry the said equipment if before take-off the equipment is found to be unserviceable and it is not reasonably practicable to repair or replace it at the aerodrome of departure and the radiation forecast available to the commander of the aircraft indicates that hazardous radiation conditions are unlikely to be encountered by the aircraft on its intended route or any planned diversion therefrom.
Scale X
Equipment capable of giving warning to the pilot of the potentially hazardous proximity of ground or water: provided that if the equipment becomes unserviceable, the aircraft may fly or continue to fly until it first lands at a place at which it is reasonably practicable for the equipment to be repaired or replaced.
Scale Y
If the aircraft has a total seating capacity of not less than 60 and not exceeding 149 passengers, one portable battery-powered megaphone capable of conveying instructions to all persons in the passenger compartment and readily available for use by a member of the crew.
If the aircraft has a total seating capacity exceeding 149 passengers, two portable battery-powered megaphones together capable of conveying instructions to all persons in the passenger compartment and readily available for use by a member of the crew.
Scale Z
An emergency lighting system to provide illumination in the passenger compartments sufficient to facilitate the evacuation of the aircraft notwithstanding the failure of the lighting systems specified in paragraph (ii) of Scale G;
An emergency lighting system to provide illumination outside the aircraft sufficient to facilitate evacuation of the aircraft.
S.I. 1980/538