(12 Sep 2018, 2:42 pm)S830OFT wrote Why are 27730 and 27739 never in service at South Shields?

Maybe they are the most unreliable of the batch? 

27730 was VOR for several weeks a few months ago and did have a very loud cooling fan.
27739 had its engine rebuilt a few years back and I'm sure still had issues afterwards.

Also, 36473 sounds terrible and has done for a while.