Viking 9,
There are ways and means for employers to 'force' an individual to work more hours than contracted. Phrases such as
Your contracted hours are 40 per week, however you will be required to work such extra hours as may be required.
Aviation is currently excluded from the EU working time directive which sets maximum limits on the amount of hours an individual can be expected to work. I believe this is due to change in the near future and we will be brought in line with other industries.
Working for small or start up operators is never easy. It is very easy to fall into the trap of working that bit extra 'to keep the company going', particularly if your boss is a 18 hour a day person. However, once you have started down that road it is very difficult to return.
Silver Star - get your friend to consult with a solicitor who specialises in employment law, especially in relation ot the contract they signed. If they are a member of a trade union then this service should come either free or at a reduced fee.