What is the definition of an IR, AMC and CS and GM and what differences can be proposed?

Implementing Rules (IR) are binding in their entirety and used to specify a high and uniform level of safety and uniform conformity and compliance. The IRs are adopted by the European Commission in the form of Regulations.
Acceptable Means of Compliance (AMC) are non-binding. The AMC serves as a means by which the requirements contained in the Basic Regulation, and the IR, can be met. However, applicants may decide to show compliance with the requirements using other means. Both NAAs and organisations may propose alternative means of compliance. ‘Alternative Means of Compliance’ are those that propose an alternative to an existing AMC. Those Alternative Means of Compliance proposals must be accompanied by evidence of their ability to meet the intent of the IR. Use of an existing AMC gives the user the benefit of compliance with the IR.
Certification Specifications (CS) are non-binding technical standards adopted by the EASA to meet the essential requirements of the Basic Regulation. CSs are used to establish the certification basis (CB) as described below. Should an aerodrome operator not meet the recommendation of the CS, they may propose an Equivalent Level of Safety (ELOS) that demonstrates how they meet the intent of the CS. As part of an agreed CB, the CS become binding on an individual basis to the applicant.
Special Conditions (SC) are non-binding special detailed technical specifications determined by the NAA for an aerodrome if the certification specifications established by the EASA are not adequate or are inappropriate to ensure conformity of the aerodrome with the essential requirements of Annex Va to the Basic Regulation. Such inadequacy or inappropriateness may be due to:
•    the design features of the aerodrome; or
•    where experience in the operation of that or other aerodromes, having similar design features, has shown that safety may be compromised.
SCs, like CSs, become binding on an individual basis to the applicant as part of an agreed CB.
Guidance Material (GM) is non-binding explanatory and interpretation material on how to achieve the requirements contained in the Basic Regulation, the IRs, the AMCs and the CSs. It contains information, including examples, to assist the user in the interpretation and application of the Basic Regulation, its IRs, AMCs and the CSs.
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