Originally Posted by
tucumseh
As the CAA promulgated this SIL,
Tuc,
a SIL is a MBA 'instruction' to all their non-MOD customers. Where contracted to do so, a DO will redraft the SIL into the MOD's required format. The same happens for export customers but where there is no contract, the operator receives the SIL anyway.
Where a civil operated ex-military type has a live ejection seat, the CAA can require compliance with the SIL before the will allow a Permit To Fly to be issued. In line with usual civil practice, I believe the CAA would treat the SIL as approved data requiring operator compliance without being "promulgated" by the regulator. If its really important from an airworthiness perspective, they can designate the content as an Airworthiness Directive.
Unlike the UK MOD approach, 'approved data' is issued mostly by the Type Designer.
EAP