At what temperature is it recommended to ground the aircraft for maintenance on the CRJ 900?

The recommended temperature to ground the CRJ 900 for maintenance is 45°C. This threshold is likely established to ensure the safety and reliability of the aircraft systems and components. At high temperatures, certain operations may be adversely affected, such as engine performance, mechanical components, and avionics systems. Grounding the aircraft at this temperature allows maintenance personnel to conduct necessary checks and ensure that components are functioning optimally without the risk of overheating or other heat-related issues that could compromise flight safety. This practice ensures that the aircraft is maintained within safe operational parameters, thereby mitigating any potential risks before the aircraft returns to service.