Which of the following instrument discrepancies could be corrected by an aviation mechanic?

The ability of an aviation mechanic to correct certain instrument discrepancies is essential for maintaining safety and instrument reliability. The correct choice involves issues that can typically be resolved through routine maintenance and repair procedures.

In this case, the selection encompasses discrepancies like a missing red line, loose mounting screws, a chipped case paint, and a leak at the line B nut. Each of these items represents a valid concern in terms of instrument functionality and safety.

The missing red line is often crucial for indicating limits or specific operational parameters on instruments like airspeed indicators or altimeters. Addressing this will ensure that pilots have clear visual cues while flying.

Loose mounting screws could compromise the integrity of the instrument's installation, leading to potential errors in readings or physical movement of the instrument during operation. Tightening these screws is a straightforward maintenance task that can prevent larger issues.

Chipped paint may not affect functionality directly but could indicate more significant wear or damage if left unaddressed. Additionally, a leak at the line B nut points to a potential issue with fluid integrity in pressure-based instruments. A mechanic can effectively tighten connections or replace any faulty components causing the leak.

Collectively, the discrepancies listed in this answer reflect a range of repairs that mechanics are trained to handle, making it the