crewmeal:
I'm pretty sure Capt Goss knew exactly what he was doing by going to Channel 4 with all the allegations. He would have worked at this for sometime and would realise the consequences of his actions. He would have documented the evidence even though Ryanair have threatened legal action. This would have not been done on a whim unlike some of the comments on here. He had a senior position with the company and realised he would probably loose his pension (if he had one). If he firmly believed in 'telling all' I'm sure he would have expected to be fired as a result.
He would have been open to a credibility issue had he waited until he was collecting his pension before speaking out with folk wondering why he didn't speak out whilst he was still in their employ. In any event do Ryanair have a company pension scheme or are all employees expected to have their own Person Pensions into which Ryanair may have contributed? In which case he might not lose out that much.
A quick google search reveals that MOL isn't too keen on pension schemes:
Ryanair attacks Aer Lingus over pensions - www.travelweekly.co.uk
Ryanair chief executive Michael O’Leary said:
“As a public company, Aer Lingus should be run for the benefit of its shareholders and not to repeatedly enrich its 3,000 staff.”