Question 22 AEL01 - Assistant Engineer - Limited

The Correct Answer is C **Why Option C (Crankcase oil level) is correct:** Checking the crankcase oil level is the most critical pre-start check because insufficient lubrication is the fastest and most certain way to cause catastrophic damage (seizure or major component failure) to an engine. If the oil level is low, starting the engine could immediately lead to metal-on-metal contact, irreparable harm, and necessitate an expensive overhaul. Therefore, this check is mandatory before every start to ensure operational integrity and longevity. **Why the other options are incorrect:** * **A) Air filters:** While important for long-term engine health and efficiency, a partially clogged air filter will reduce power and increase smoke but will not typically cause immediate engine failure upon starting. Checking the filter is part of routine maintenance, not a critical pre-start necessity for *every* start. * **B) Fuel oil strainers:** These strainers prevent contaminants from reaching the injection system. They should be checked and cleaned regularly, but unless there is a known fuel contamination issue, failing to check them immediately before starting will likely not cause catastrophic failure upon start-up, though it could lead to eventual power loss or injector damage. The lack of oil (C) is a much more immediate threat. * **D) Pyrometer readings:** Pyrometers measure exhaust gas temperature, which is a diagnostic tool used *while* the engine is running (or after a run) to monitor cylinder balance and loading. They provide no useful information prior to starting the engine and therefore cannot be a mandatory pre-start check.