21.A.804 Identification of parts, appliances, and control and monitoring unit (CMU) components

• Regulation (EU) No 2021/699 found in: Initial Airworthiness and Environmental Protection (748/2012) Part-21 Part-21L (Jul 2024)
• Regulation (EU) 2024/1108 found in: Initial Airworthiness and Environmental Protection (748/2012) (Nov 2025)

21.A.804 Identification of parts and appliances Regulation (EU) No 2021/699 (a)     Each part or appliance which is eligible for installation in a type-certified product shall be marked permanently and legibly with: 1.       a name, trademark, or symbol identifying the manufacturer in a manner identified by the applicable design data; 2.       the part number, as defined in the applicable design data; and 3.       the letters EPA for parts or appliances produced in accordance with approved design data not belonging to the type-certificate holder of the related product, except for ETSO articles and for parts and appliances covered under point (b) of point [21.A.307](#_DxCrossRefBm1649097401). (b)     By way of derogation from point (a), if the Agency agrees that a part or appliance is too small or that it is otherwise impractical to mark a part or appliance with any of the information required by point (a), the authorised release document accompanying the part or appliance or its container shall include the information that could not be marked on the part or appliance. #### 21.A.804 Identification of parts, appliances, and control and monitoring unit (CMU) components *Regulation (EU) 2024/1108* (a) Each part or appliance which is eligible for installation in a type-certified product, and each CMU component which is eligible for installation in a CMU certified in accordance with this Annex I, shall be permanently and legibly marked with: 1. a name, trademark, or symbol identifying the manufacturer in a manner identified by the applicable design data; 2. the part number, as defined in the applicable design data; and 3. the letters ‘EPA’: (i) for parts or appliances produced in accordance with approved design data that does not belong to the type-certificate holder of the related product, except for ETSO articles and for parts and appliances covered under point [21.A.307](#_DxCrossRefBm485230893)(b); (ii) for CMU components produced in accordance with approved design data that does not belong to the type-certificate holder of the related CMU, or to the UA type-certificate holder when the CMU is certified as part of the UA, except for ETSO CMU components and CMU components covered under point [21.A.308](#_DxCrossRefBm485230900)(b). (b) By way of derogation from point (a), if the Agency agrees that a part, appliance or a CMU component is too small, or that it is otherwise impractical to mark a part, appliance or a CMU component with any of the information required by point (a), the authorised release document that accompanies the part, appliance or the CMU component or its container shall include the information that could not be marked on the part, appliance or CMU component.