can you send an example for writing a cover letter when you applying for job as a maintenance planner at factory?
Can I advise you to have a look at the following address,

http://www.bbpa.co.uk/jobsearch/jguide-covering-letter.htm

In it you'll find all sorts of information regarding the writing of a covering letter. To be really honest with you, I haven't got a clue what a maintenance planner is!