Explanation: A D-check is also referred to as Heavy Maintenance Visit and it requires the most space of all maintenance checks. Due to the extensive amount of work done in D-checks, it requires up to 40,000 man hours.

Explanation: Aircraft maintenance checks are periodic checks that are performed on all aircraft after a certain amount of time/flying hours, to ensure that they are airworthy. Military aircraft may or may not follow maintenance programs similar to commercial aircraft operators. This is due to different roles performed by the aircraft and thus having different requirements.

Explanation: A maintenance release can also be called a certificate of release to service (CRS). The maintenance release is signed by a person authorized by the national airworthiness authority and it signifies that the aircraft is airworthy and can be released to service.

Explanation: ICAO refers to The International Civil Aviation Organization. The ICAO specifies international air navigation techniques and acts as a governing body to the aviation regulating authorities in different regions around the world.

Explanation: The Civil Aviation Safety Authority (CASA) issues the ADs in Australia. ADs in India, Canada and New Zealand are issued by DGCA, Transport Canada and New Zealand Civil Aviation Authority respectively.

Explanation: Continuous Airworthiness Maintenance Program (CAMP) includes both routine and detailed inspections. All commercial aircraft operators have such a program. Such programs are necessary for the aircraft’s airworthiness.

Explanation: Line Maintenance is a 45 minutes activity during which the aircraft is refueled and all critical instruments are checked for defects.

Explanation: AMP refers to Aircraft Maintenance Program. It is a document that ensures the continuous airworthiness of an aircraft by enlisting the maintenance requirements, that need to be carried out.