If you got the interviw you probabaly got the qualifications for the job. What the people who are hiring want to hear about is your commitment to excellence.To many engineering departments have been run by pot belly crude men who feel that other departments within a building just interfere with what engineering needs to do. You need to let the interviewer know that you and the department are part of a team.
Here are some other helpfull tips
Explain your past experiences in improving an engineering department.
How you would measure performance and how you would improve it
Emphasise your comitment to customer service. Engineering is a support deparment sevicing visitors and employees a like
I hope this helps .. I have been in healthcare Facility management for sevral years. I have been offered just about every job I have applied for by touching on these key issues