Document ID: chunk:federal_register_of_legislation:F2025C00150:front:0:p9
Version: federal_register_of_legislation:F2025C00150
Segment Type: other
Provision Reference: 
Character Range: 23338–29406

a certificate of release to service for base maintenance carried out on a large aircraft for the aircraft in its entirety, if:
 (i) the maintenance was carried out on a large aircraft; and
 (ii) the Category C holder's licence is endorsed with the type rating for the large aircraft.

Table 1

Aircraft systems, designations and conditions for Category B1 and Category B2 licences
Aircraft system (and ATA chapter reference)                                                             Designation of system                    Conditions or limitations
Pressurisation, air‑conditioning and equipment cooling systems (ATA21)                                  Mechanical (B1)                          For a Category B2 licence, pressurisation control systems.
Autopilot (ATA22)                                                                                       Avionic (B2)
Communications (ATA23), including ELT and underwater locating beacon (ATA25-60)                         Avionic (B2)
Generator and/or constant speed drive/IDG systems (ATA24)                                               Electrical (B1/B2) and  Powerplant (B1)
Electrical power supply systems, including a ram air turbine, if electrical (ATA24)                     Electrical
                                                                                                        (B1 and B2)
Equipment, furnishings and emergency equipment (ATA25)                                                  Mechanical (B1)                          Except ELT and underwater locating beacon (ATA 25-60) — see (ATA23).
Fire, smoke, overheat detecting and extinguishing systems (ATA26)                                       Mechanical (B1)
Flight control systems (ATA27)                                                                          Mechanical (B1)                          For a category B1 licence — except system operation – fly-by-wire.
Flight control systems – system operation – fly‑by-wire (ATA27)                                         Avionic (B2)                             For a Category B2 licence — limited to the avionic subsystem of the flight control system.
Fuel systems (ATA28)                                                                                    Mechanical (B1)
Hydraulic power systems, including ram air turbine (ATA29)                                              Mechanical (B1)
Ice and rain protection systems (ATA30)                                                                 Mechanical (B1)
Ice and rain protection systems (ATA30-20)                                                              Mechanical and Powerplant (B1)           Powerplant — for powerplant cowling anti‑icing.
Indicating and recording systems (ATA31)                                                                Avionic (B2)
Landing gear (ATA32)                                                                                    Mechanical (B1)
Wheels and brakes (ATA32-40)                                                                            Mechanical (B1)
Lighting (ATA33)                                                                                        Electrical
                                                                                                        (B1 and B2)
Navigation systems:                                                                                     Avionic (B2)                             For a Category B1 licence — compass swings, if endorsed on the licence.
      * General
      * Radio interface
      * ACARS, SELCAL, INS/IRS
      * Compass
      * Flight manage-ment system
      * Doppler systems
 (ATA34)
Oxygen system                                                                                           Mechanical (B1)                          For a Category B2 licence, if endorsed on the licence.
(ATA35)
Pneumatic system (ATA36)                                                                                Mechanical (B1)
Vacuum (ATA37)                                                                                          Mechanical (B1)
Waste water (ATA38)                                                                                     Mechanical (B1)
Integrated modular avionics (ATA42)                                                                     Avionic (B2)
Cabin systems                                                                                           Avionic (B2)
(ATA44)
Central maintenance system (ATA45)                                                                      Avionic (B2)
Information systems                                                                                     Avionic (B2)
      * ATIMS
      * Network server
 (ATA46)
Nitrogen generation system or inert gas system (ATA47)                                                  Mechanical (B1)
APU (ATA49)                                                                                             Powerplant (B1)
Cargo and accessory compartments (ATA50)                                                                Mechanical (B1)
Structures — General (ATA51)                                                                            Structural (B1)                          Structures — general, but excluding wooden structures and fabric surfaces unless:
                                                                                                                                                    (a) for wooden structures — the holder has obtained the relevant optional units of competency mentioned in section 66.A.25 of this MOS; or
                                                                                                                                                 Note   These optional units of competency are marked W in Appendix IV.
                                                                                                                                                    (b) for fabric surfaces — the holder has obtained the relevant optional units of