Final answer:
The aircraft journey log must be on board at all times during flights. There are exceptions, such as when an aircraft is operated by a flight training unit. These requirements help ensure safety and proper maintenance records.
Step-by-step explanation:
Regarding the question with respect to the aircraft journey log, which of the following is true? The correct answer in most regulatory environments is that the journey log must be on board at all times. However, there are exceptions, such as when flying with a recognized flight training unit where the journey log may not be required on board. These regulations are in place to ensure the safety and accountability of aircraft operations.
Inspection of the aircraft journey log is often a requirement during ramp checks by aviation authorities. The log provides critical information about the aircraft's operations, maintenance, and flight history. It is essential to adhere to these regulations as they are part of standard operating procedures that promote safe aviation practices. The journey log is not just an operational requirement; it plays a vital role in ongoing aircraft maintenance and airworthiness.
So, to directly address the options provided: a) is not universally true, as the log must be on board at all times, not just beyond a certain distance; b) is incorrect because the log is required regardless of whether you plan to shut down at a different aerodrome; c) is partially true, as the exception with a flight training unit does exist in some cases; d) is the correct general rule that the journey log must be on board at all times, with the noted exception for flight training units.