What is the minimum outside air temperature required for starting the transmission oil system?

• A. -30 C
• B. -25 C
• C. -20 C
• D. -15 C

Answer: (B)

The correct choice indicates that the minimum outside air temperature required for starting the transmission oil system is -25 degrees Celsius. This value is critical because it ensures that the transmission oil is within an acceptable viscosity range for proper operation during engine start-up.

Starting at temperatures below this threshold may lead to difficulties in initiating the lubrication process, which is essential for preventing wear and damage to the transmission components. If the oil is too viscous, it may not flow adequately, potentially resulting in inadequate lubrication during a critical phase of operation.

This temperature requirement is derived from considerations of both the mechanical properties of the transmission oil and the overall performance and reliability of the transmission system, ensuring it operates safely and effectively in cold weather conditions. It is essential for operators and maintainers to be aware of this parameter to avoid potential operational failures and maintain the integrity of the aircraft's systems.