Final answer:
The question pertains to Night VFR obstacle clearance minimums in mountainous regions for commercial air operations. Specific minimums are required to ensure safety by maintaining a buffer between the aircraft and any terrain or obstacles.
Step-by-step explanation:
The question is about the obstacle clearance minimums for Night Visual Flight Rules (VFR) in a mountainous region for a 705 operation, which relates to commercial air services according to Canadian aviation regulations. The obstacle clearance minimums are essential for ensuring safety during flight operations, especially at night when visibility is reduced. Although the specific numbers required are not provided in the question, generally the minimums are higher in mountainous areas to account for elevated terrain and uneven surfaces. Pilots must adhere to the established minimum altitude requirements, which provide a safety buffer between the aircraft and the terrain or obstacles such as mountain peaks and other terrain features.