There are many factors to consider when it comes to calibrating your aircraft jacks. For your convenience, we have compiled a checklist containing all of the necessary steps. Your calibration lab should be following these steps to ensure your aircraft jacks are being properly maintained.
- Maintenance and repair work should be completed using safe practices and proper tools
- Work area should be free of all debris
- When O-rings and backup rings are removed, avoid making contact with critical surfaces other parts. Surface deformities could cause degradation of seals
- Replace both O-rings and backup rings once removed. Damaged O-rings result in fluid leakage
- Cylinder bore can be honed to a max diameter of 2.629 inches and a surface finish of 16 micro inches. If pitting bore cannot be removed, the jack cylinder must be replaced
- Flush old hydraulic fluid from system and replenish with new hydraulic fluid
- When refilling hydraulic system, characteristics of the fluid used in the jack and the level of fluid should be noted
- Jack should be maintained and repaired in accordance with the manufacturer’s instructions
- No modifications shall be carried out that adversely affect the compliance of the jack with draft standard 2006/42/EC
- If jack is disassembled, the unit should be proof load tested to insure relief vale is set correctly to ensure the jack does not overload itself
- Check fluid level each use
- Lubricate casters every three months
- Clean annually or as needed
The ultimate guide to understanding aircraft jack proof load testing.
Read it here.