The maintenance work of aircraft is divided into line maintenance, periodic inspections, etc.
Line maintenance can be divided into pre-flight, short stop, and post-flight maintenance.
Periodic maintenance is categorized based on flight time (the time from takeoff to landing), flight cycles (takeoffs and landings), or calendar time, intoA inspections, B inspections, C inspections, and D inspections.
A inspections are the simplest periodic inspections, including lubrication maintenance, usage checks, functional tests, and regular scrapping. They are usually conducted during line maintenance.
B inspections are typically adjusted to align withA inspections.
C inspections are routine checks that not only include all tasks ofA inspections but also require opening various component covers of the aircraft for in-depth functional checks and maintenance, usually conducted at maintenance bases.
D inspections (overhauls) have the most comprehensive inspection scope. They involve opening all covers of the aircraft and nearly disassembling all equipment and components, typically performed at maintenance bases.
The interval time is related to the aircraft model. Taking the C909 aircraft as an example, 8A=C, 8C=D
|
Serial Number |
Inspection Type |
Cycle |
|
1 |
A |
500FH/500 flight cycles |
|
2 |
C |
4000FH/4000 flight cycles |
|
3 |
D |
32000FH/32000 flight cycles |
After the overhaul is completed, a new periodic inspection cycle begins.