Page 102 - UK Regulation Part 21 Initial Airworthiness Annex I (consolidated) March 2022

PART 21 - INITIAL AIRWORTHINESS (ANNEX I)

airworthiness of the product.
21.A.126 GM Production inspection system
GM 21.A.126(a) and (b) have been developed for persons producing under Part 21 Section A Subpart
F on the long term basis as defined in 21.A.124(b)(1)(i).
For those persons producing under Part 21 Section A Subpart F as a transient phase under
21.A.124(b)(1)(ii), compliance with 21.A.126 may also be demonstrated to the satisfaction of the CAA
by using the equivalent Part 21 Section A Subpart G AMC/GM.
21.A.126(a)(1) GM Production inspection system – Conformity of supplied parts, appliances and material
1. The person producing under Subpart F is responsible for determining and applying
acceptance standards for physical condition, configuration status and conformity, as
appropriate, of raw materials, subcontracted works, and supplied products, parts,
appliances or material, whether to be used in production or delivered to customers as
spare parts. This responsibility also includes BFE (Buyer Furnished Equipment) items.
2. Control may be based upon use of the following techniques, as appropriate:
2.1 first article inspection, including destruction if necessary, to verify that the article
conforms to the applicable data for new production line or new supplier,
2.2 incoming inspections and tests of supplied parts or appliances that can be
satisfactorily inspected on receipt,
2.3 identification of incoming documentation and data relevant to the showing of
conformity to be included in the certification documents,
2.4 any additional work, tests or inspection which may be needed for parts or
appliances which are to be delivered as spare parts and which are not subject to
the checks normally provided by subsequent production or inspection stages.
3. The person producing under Part 21 Subpart F may rely upon the CAA Form 1 issued in
accordance with Part 21 if provided as evidence of conformity with applicable design data
For suppliers not holding a POA the inspection system of the person producing under Part
21 Subpart F should establish a system for control of incoming materials and bought or
subcontracted items which provides for inspections and tests of such items by the person
producing under Part 21 Subpart F at the supplier’s facility, if the item cannot or will not be
completely inspected upon receipt.
21.A.126(a)(2) GM Production inspection system – Identification of incoming materials and parts
All parts and materials coming from external parties should be identified and inspected to ascertain
that they have not been damaged during transport or unpacking, that the incoming parts and materials
have the appropriate and correct accompanying documentation and that the configuration and
condition of the parts or materials is as laid down in that documentation.
Only on completion of these checks and of any incoming further verifications laid down in the
procurement specification, may the part or material be accepted for warehousing and used in
production.
This acceptance should be certified by an inspection statement.
A suitable recording system should allow reconstruction at any time of the history of every material or
part.
The areas where the incoming checks are carried out and the materials or parts are stored pending
completion of the checks should be physically segregated from other departments.
21.A.126(a)(3) GM1 Production inspection system – List of specifications
It is the responsibility of:
1. The designer, to define all necessary processes, techniques and methods to be followed
during manufacture (2A.31) and this information will be provided as part of the applicable
design data.
2. The manufacturer, to ensure that all processes are carried out strictly in accordance with
the specifications provided as part of the applicable design data.
21.A.126(a)(3) GM2 Production inspection system – Means of checking of the production processes
The Production Inspection System should be provided with appropriate means of checking that
production processes, whether performed by the person producing under Part 21 Subpart F or by
sub- contractors under its control, are carried out in accordance with applicable data, including:
1. A system for the control and authorised amendment of data provided for the production,
inspection and test to ensure that it is complete and up-to-date at the point of use
2. Availability of personnel with suitable qualification, experience, and training for each
required production, inspection, and test task. Special attention should be paid to tasks
requiring specialised knowledge and skill, e.g., NDT/NDI, welding...
3. A working area where the working conditions and environment are controlled as
appropriate in respect of: cleanliness, temperature, humidity, ventilation, lighting,
space/access, protection against noise and pollution
4. Equipment and tools sufficient to enable all specified tasks to be accomplished in a safe
and effective manner without detrimental effect on the items under production. Calibration
control of equipment and tools which affect critical dimensions and values must
demonstrate compliance with, and be traceable to, recognised national or international
standards.
21.A.126(a)(4) GM Production inspection system – Applicable design/production data procedures
1. When a person producing under Part 21 Subpart F is developing its own manufacturing
data from the design data package delivered by a Design holder, procedures should
demonstrate the correct transcription of the original design data.
2. Procedures should define the manner in which applicable design data is used to issue
and update the production/inspection data, which determines the conformity of products,
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