Sec. 80.1105  Maintenance requirements.

    (a) Equipment must be so designed that the main units can be 
replaced readily, without elaborate recalibration or readjustment. Where 
applicable, equipment must be constructed and installed so that it is 
readily accessible for inspection and on-board maintenance purposes. 
Adequate information must be provided to enable the equipment to be 
properly operated and maintained (see IMO Resolution A.569(14)).
    (b) Radio equipment required by this subpart must be maintained to 
provide the availability of the functional requirements specified in 
Sec. 80.1081 and to

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meet the performance standards specified in Sec. 80.1101.
    (c) On ships engaged on voyages in sea areas A1 and A2, the 
availability must be ensured by duplication of equipment, shore-based 
maintenance, or at-sea electronic maintenance capability, or a 
combination of these.
    (d) On ships engaged on voyages in sea areas A3 and A4, the 
availability must be ensured by using a combination of at least two of 
the following methods: duplication of equipment, shore-based 
maintenance, or at-sea electronic maintenance capability.
    (e) Irrespective of the maintenance methods used, a ship must not 
depart from any port unless and until the ship is capable of performing 
all distress and safety functions as specified in Sec. 80.1081.
    (f) Irrespective of the maintenance methods used, all manufacturers' 
instruction manuals and maintenance manuals for each piece of equipment 
required and installed must be available on-board ship. Adequate tools, 
spare parts, and test equipment appropriate to the methods used by the 
ship as recommended by the manufacturer should be provided. The manuals, 
tools, spare parts, and test equipment, as applicable, should be readily 
accessible.
    (g) If the duplication of equipment maintenance method is used, the 
following radio installations, in addition to other equipment 
requirements specified in this subpart, must be available on-board ships 
for their sea areas as applicable. Equipment carried in accordance with 
this paragraph must comply with Secs. 80.1101 and 80.1103. Additionally, 
each radio installation must be connected to a separate antenna and be 
installed and be ready for immediate operation.
    (1) Ships, equipped in accordance with Sec. 80.1087 for sea area A1, 
must carry a VHF radio installation complying with the requirements of 
Sec. 80.1085(a)(1).
    (2) Ships, equipped in accordance with Sec. 80.1089 for sea areas A1 
and A2, must carry a VHF radio installation complying with the 
requirements of Sec. 80.1085(a)(1) and an MF radio installation 
complying with the requirements of Sec. 80.1089(a)(1) and being able to 
fully comply with watch requirements as specified in Sec. 80.1123(a)(2). 
The MF radio installation installed for duplication must also comply 
with the requirements Sec. 80.1089(c).
    (3) Ships, equipped in accordance with Sec. 80.1091 for sea areas 
A1, A2, and A3, must carry a VHF radio installation complying with the 
requirements of Sec. 80.1085(a)(1) and either an MF/HF radio 
installation complying with the requirements of Sec. 80.1091(b)(1) and 
being able to fully comply with watch requirements as specified in 
Sec. 80.1123(a)(2) or an INMARSAT ship earth station complying with the 
requirements of Sec. 80.1091(a)(1). The MF/HF radio installation or the 
INMARSAT ship earth station installed for duplication must also comply 
with the requirements Sec. 80.1091(c).
    (4) Ships, equipped in accordance with Sec. 80.1093 for sea areas 
A1, A2, A3, and A4, must carry a VHF radio installation complying with 
the requirement of Sec. 80.1085(a)(1) and an MF/HF radio installation 
complying with the requirements of Sec. 80.1091(b)(1) and being able to 
fully comply with watch requirements as specified in Sec. 80.1123(a)(2). 
The MF/HF radio installation installed for duplication must also comply 
with the requirements Sec. 80.1091(c).
    (h) The radio installations specified in paragraph (g) of this 
section (referred as ``duplicated equipment''), in addition to the 
appropriate radio equipment specified in Sec. 80.1099 (referred as 
``basic equipment''), must be connected to the reserve sources of energy 
required by Sec. 80.1099. The capacity of the reserve sources of energy 
should be sufficient to operate the particular installation (i.e., the 
basic equipment or the duplicated equipment) with the highest power 
consumption, for the appropriate period specified in Sec. 80.1099. 
However, the arrangement for the reserve sources of energy must be such 
that a single fault in this arrangement cannot affect both the basic and 
the duplicated equipment.
    (i) If the shore-based maintenance method is used, the following 
requirements apply.
    (1) Maintenance services must be completed and performance verified 
and noted in the ship's record before departure from the first port of 
call entered after any failure occurs.

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    (2) Each GMDSS equipment must be tested and performance verified and 
the results noted in the ship's record before departure from every port. 
To accomplish this, each ship shall carry a performance checkoff sheet 
listing each GMDSS equipment carried on a mandatory basis.
    (j) If the at-sea maintenance method is used, the following 
requirements apply.
    (1) Adequate additional technical documentation, tools, test 
equipment, and spare parts must be carried on-board ship to enable a 
qualified maintainer as specified in Sec. 80.1074 to perform tests and 
localize and repair faults in the radio equipment.
    (2) Only persons that comply with the requirements of Sec. 80.1074 
may perform at-sea maintenance on radio installations required by this 
subpart.

       Operating Procedures for Distress and Safety Communications