Actually, SASCO/Singaporean environmental restrictions are probably stricter than the EPA really. But that is beside the point.
The point is the companies are very clever are appeasing the unions and diverting attention away from the problems of hiring unskilled personnel and expecting licensed or senior staff to cover for them. If they have to hire more skilled staff it will cost them more, if the unions work to rule and delay the aircraft, it will cost them more again.
If they out source to third party facilities..it is cheaper and the relevant cost of a few snags and a bit of overtime is worth bearing over a year or so.
To a degree I would defend the third party work done by sasco. At the end of the day Northwest have/had a number of reps on site in Singapore who call the shots. Doesn't some responsibility lie with them?
The best course of action is stand by your word, if you are not happy with the work performed by your crew...speak up now or forever hold thy peace.