LEARJET 31A — Service Bulletins

This document is a technical tip for the Learjet 31A model, addressing issues related to takeoff pressurization bumps. It outlines the anomalies experienced during takeoff and provides a cockpit procedure to mitigate these issues.

• Some Learjet 31A models experience large transitional pressurization bumps after takeoff.
• Extensive testing and component replacements have not resolved the issue.
• The pressurization system is similar to that of the 35A/36A models, which rarely experience these bumps.
• A specific cockpit procedure can help reduce the severity of the bumps.
• The procedure involves adjusting the pressurization module rate selector during takeoff.
• The second down-rate bump is most noticeable to passengers and crew.
• Contact information for Learjet Technical Specialists is provided for further assistance.