Assault occasioning ABH will never be filtered from a DBS check so even if it's spent it will still show.
https://www.gov.uk/government/public...l-record-check Therefore whilst you have no obligation to tell your potential employer about a spent conviction as the ABH isn't filtered they will see it even on a basic disclosure.
The above says it all. There is no way you will hold an airside pass with a previous ABH. It's with you for life. Many country's will mark you as 'criminally inadmissible'. You have more than one offence that will show on some checks, that makes it even harder.
Have you ever committed, been arrested for, been charged with or convicted of any criminal offence in any country? Select ‘Yes’ if you have ever committed, been charged with or convicted of a crime in any country.
The above is cut and paste from Canada, for example. You cannot even go on holiday there without prior Canadian approval - that's just for a tourist.
Sadly, your (lifetime) ABH is the sticking point here as you will never be deemed rehabilitated.
criminal convictions obtained in the UK are generally assessed under the Rehabilitation of Offenders Act 1974 instead of under the Immigration & Refugee Protection Act. As a result, once your criminal record becomes spent under the 1974 Act, you cease to be inadmissible to Canada and are regarded as ‘deemed rehabilitated’.
Many countries don't welcome criminals for obvious reasons, but what criminal history is relevant and the period that must have elapsed since a conviction varies from country to country. For some countries, particularly Canada and the US, even a minor criminal conviction 50 years ago can cause you to be refused entry, while others would require a conviction for a violent or serious crime to be refused entry.
https://en.wikivoyage.org/wiki/Trave...iminal_history
'Moral Turpitude' is grounds for not being issued a UAE visa also.
Sorry to be the bearer of bad news.
https://www.mygov.scot/disclosure-ty...cotland.co.uk/
Why not apply for your own CRC from disclosure, and see what it says?
You could always work as an instructor from an airfield that does not have an airside pass system. Even bush flying in some countries in Cessna 206/208's etc require a CRC for a visa. Good luck though, and all the best.