The company says 109 jobs are under consultation at Manchester, 12 in Luton and two in Birmingham.
 
The Monarch group has been restructuring since it was bought by investment firm Greybull Capital in October 2014. Greybull agreed to pump £125 million into it, effectively rescuing the then loss-making company. The deal was dependent on Monarch making annual savings of £200 million including pay cuts of up to 30%.

Unite national officer for civil air transport, Oliver Richardson said: “Eighteen months ago our members at Monarch made significant sacrifices in terms of their pay, and terms and conditions to help secure the deal with Greybull Capital.

“So it is very disappointing and a severe blow to our engineering members to hear this news when they have played their part in turning around Monarch and making the airline the profitable business that it is today.”

Unite says the hangar in Manchester provides the heavy maintenance for the Monarch fleet – work that will be transferred to Birmingham and Luton. A maintenance line for quick turn-around services for aircraft will be kept at Manchester.

The company said alternative roles would be offered to those affected.

Unite is due to meet with management on Thursday to try to avoid compulsory redundancies.