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NPA 2009-02b 30 Jan 2009

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AMC2 OPS.CAT.525.A Communication and navigation equipment for VFR ascontrolled flights, night flights and IFR flights Motor-powered aircraft

ACCEPTABLE NUMBER AND TYPE OF COMMUNICATION AND NAVIGATION EQUIPMENT FORAEROPLANES

1. Aeroplanes should be equipped with:

a. One VOR receiving system, one ADF system, one DME, except that an ADFsystem need not be installed provided that the use of ADF is not required in anyphase of the planned flight;

b. One ILS or MLS where ILS or MLS is required for approach navigation purposes;

c. One Marker Beacon receiving system where a Marker Beacon is required forapproach navigation purposes;

d. Area Navigation equipment when area navigation is required for the route beingflown (e.g. equipment required by OPS.SPA.001.SPN);

e. An additional DME system on any route, or part thereof, where navigation isbased only on DME signals;

f. An additional VOR receiving system on any route, or part thereof, wherenavigation is based only on VOR signals; and

g. An additional ADF system on any route, or part thereof, where navigation is

based only on NDB signals.

2. An aeroplane may be operated without the navigation equipment specified in 1.e. and1f. provided it is equipped with alternative equipment. The reliability and the accuracy ofalternative equipment should allow safe navigation for the intended route.

3. For short haul operations (operations not crossing the North Atlantics) in the NAT MNPSairspace, an aeroplane may be equipped with only one Long Range CommunicationSystem (HF-system) if alternative communication procedures are published for the

airspace concerned.

4. An operator should ensure that aeroplanes conducting ETOPS have a communicationmeans capable of communicating with an appropriate ground station at normal andplanned contingency altitudes. For ETOPS routes where voice communication facilities

are available, voice communications shall be provided. For all ETOPS operations beyond180 minutes, reliable communication technology, either voice based or data link, shouldbe installed. Where voice communication facilities are not available and where voicecommunication is not possible or is of poor quality, communications using alternative

systems should be ensured.

5. To perform IFR operations without an ADF system installed, an operator should considerthe following guidelines on equipment carriage, operational procedures and training

criteria.

a. The removal/non installation of ADF equipment from an aeroplane may only bedone where it is not essential for navigation, and provided that alternativeequipment giving equivalent or enhanced navigation capability is carried. Thismay be accomplished by the carriage of an additional VOR receiver or a GNSSreceiver approved for IFR operations.

b. For IFR operations without ADF, an operator should ensure that:

i. route segments that rely solely on ADF for navigation are not flown;

ii. a firm commitment is made not to fly any ADF/NDB procedures;

iii. that the MEL has been amended to take account of the non-carriage of

ADF;