Boeing shares slipped on Monday as the planemaker grapples with an ongoing strike and a ballooning threat to its bottom line. 

Chief Financial Officer Brain West, in a letter to employees, outlined the risks facing the company while also announcing a hiring freeze as well as a delay in pay hikes for salaried workers. 

Read his memo to Boeing's rank and file below. 

Team,
 
As you know, our IAM 751 and W24 represented employees in the Pacific Northwest are on strike. We are working in good faith to reach a new contract agreement that reflects their feedback and enables operations to resume. 
 
However, our business is in a difficult period. This strike jeopardizes our recovery in a significant way and we must take necessary actions to preserve cash and safeguard our shared future. Importantly, we will protect all funding for safety, quality and direct customer support work.  
 
Actions include:

In parallel to the steps above, we are planning to make significant reductions in supplier expenditures and will stop issuing the majority of supplier purchase orders on the 737, 767 and 777 programs. We are also considering the difficult step of temporary furloughs for many employees, managers and executives in the coming weeks.
 
I know that these actions will create some uncertainty and concern, as well as many questions. We’ll be sharing additional information in the coming days as we have detailed guidance on implementation of these measures. 
 
Brian 

Boeing shares have lost over 40% this year compared to the S&P 500's 17%+ rise.