1. Civil Aviation Authority (1981) British Civil Airworthiness Requirements, Section C3–2, Paragraph 1.2, Civil Aviation Authority, London
2. Civil Aviation Authority (1981) British Civil Airworthiness Requirements, Section C3–2 Appendix, Paragraph 1.1.1, Civil Aviation Authority, London
3. Civil Aviation Authority (1981) British Civil Airworthiness Requirements, Section C3–2 Appendix, Paragraph 1.2, Civil Aviation Authority, London
4. Civil Aviation Authority (1981) British Civil Airworthiness Requirements, Section Cl–2, Paragraph 4.1.1, Civil Aviation Authority, London
5. Civil Aviation Authority (1981) British Civil Airworthiness Requirements, Section Cl–2, Paragraph 1.10, Civil Aviation Authority, London