Page 365 - UK Air Operations Regulations (Consolidated) 201121

Part CAT - ANNEX IV - Commercial Air Transport Operations

glide slope deviation should apply to all final approach glide slopes with angular vertical navigation
(VNAV) guidance, whether provided by the instrument landing system (ILS), microwave landing system
(MLS), satellite based augmentation system approach procedure with vertical guidance (SBAS APV
(localiser performance with vertical guidance approach LPV)), ground-based augmentation system
(GBAS (GPS landing system, GLS) or any other systems providing similar guidance. The same
requirement should not apply to systems providing vertical guidance based on barometric VNAV.
CAT.IDE.A.150 GM1 Terrain awareness warning system (TAWS)
ACCEPTABLE STANDARD FOR TAWS
An acceptable standard for Class A and Class B TAWS may be the applicable technical standards
order (TSO) issued by the CAA or equivalent.
CAT.IDE.A.155 Airborne collision avoidance system (ACAS)
Unless otherwise provided for by Regulation (EU) No 1332/2011, turbine-powered aeroplanes with an
MCTOM of more than 5 700 kg or an MOPSC of more than 19 shall be equipped with ACAS II.
CAT.IDE.A.160 Airborne weather detecting equipment
The following shall be equipped with airborne weather detecting equipment when operated at night or
in IMC in areas where thunderstorms or other potentially hazardous weather conditions, regarded as
detectable with airborne weather detecting equipment, may be expected to exist along the route:
(a) pressurised aeroplanes;
(b) non-pressurised aeroplanes with an MCTOM of more than 5 700 kg; and
(c) non-pressurised aeroplanes with an MOPSC of more than nine.
CAT.IDE.A.160 AMC1 Airborne weather detecting equipment
GENERAL
The airborne weather detecting equipment should be an airborne weather radar, except for propeller-
driven pressurised aeroplanes with an MCTOM not more than 5 700 kg and an MOPSC of not more
than 9, for which other equipment capable of detecting thunderstorms and other potentially hazardous
weather conditions, regarded as detectable with airborne weather radar equipment, are also
acceptable.
CAT.IDE.A.165 Additional equipment for operations in icing conditions at night
(a) Aeroplanes operated in expected or actual icing conditions at night shall be equipped with a
means to illuminate or detect the formation of ice.
(b) The means to illuminate the formation of ice shall not cause glare or reflection that would
handicap crew members in the performance of their duties.
CAT.IDE.A.170 Flight crew interphone system
Aeroplanes operated by more than one flight crew member shall be equipped with a flight crew
interphone system, including headsets and microphones for use by all flight crew members.
CAT.IDE.A.170 AMC1 Flight crew interphone system
TYPE OF FLIGHT CREW INTERPHONE
The flight crew interphone system should not be of a handheld type.
CAT.IDE.A.175 Crew member interphone system
Aeroplanes with an MCTOM of more than 15 000 kg, or with an MOPSC of more than 19 shall be
equipped with a crew member interphone system, except for aeroplanes first issued with an individual
CofA before 1 April 1965 and already registered in the United Kingdom on 1 April 1995.
CAT.IDE.A.175 AMC1 Crew member interphone system
SPECIFICATIONS
The crew member interphone system should:
(a) operate independently of the public address system except for handsets, headsets,
microphones, selector switches and signalling devices;
(b) in the case of aeroplanes where at least one cabin crew member is required, be readily
accessible for use at required cabin crew member stations close to each separate or pair
of floor level emergency exits;
(c) in the case of aeroplanes where at least one cabin crew member is required, have an
alerting system incorporating aural or visual signals for use by flight and cabin crew;
(d) have a means for the recipient of a call to determine whether it is a normal call or an
emergency call that uses one or a combination of the following:
(1) lights of different colours;
(2) codes defined by the operator (e.g. different number of rings for normal and
emergency calls); or
(3) any other indicating signal specified in the operations manual;
(e) provide two-way communication between:
(1) the flight crew compartment and each passenger compartment, in the case of
aeroplanes where at least one cabin crew member is required;
(2) the flight crew compartment and each galley located other than on a passenger deck
level, in the case of aeroplanes where at least one cabin crew member is required;
(3) the flight crew compartment and each remote crew compartment and crew member
station that is not on the passenger deck and is not accessible from a passenger
compartment; and
(4) ground personnel and at least two flight crew members. This interphone system for
use by the ground personnel should be, where practicable, so located that the
personnel using the system may avoid detection from within the aeroplane; and
(f) be readily accessible for use from each required flight crew station in the flight crew
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