Saturday, May 28, 2011

Jacking Procedure-Raising

The general procedure for raising the complete aircraft on jacks is as follows:
1        Place Safety Barriers in position around the aircraft.
2        Place warning notices in the aircraft cockpit.
3        Ensure that Ground Safety Locks are fitted to all Landing Gears.
4        Ensure Wheel Chocks are fitted.
5        Ensure the Brakes are applied.
6        Ensure that the aircraft is balanced and stable.
7        Ensure that the aircraft is in the ‘Clean Flight Configuration’. (Flaps/Slats are housed)
8        Deactivate the relevant circuit breakers to ensure that there will be no movement of flight controls or the operation of other in-flight systems.  NB: As the aircraft is raised it moves from the ‘Ground Configuration’ to the ‘Flight Configuration’.
9        Fit Jacking Pads and Adaptors.
10      Position the jacks under the aircraft, just taking a little of the aircraft’s weight.
11      Remove Wheel Chocks.
12      Release the Brakes.
13      Ensure that all the passenger/crew doors, the emergency exits and the cargo doors are closed and locked or fully open and locked.
14      Remove access ladders and platforms.
15      Clear the area around the aircraft of all ground support and maintenance equipment and ensure that no other work is being carried out.
16      Operate the nose jack if necessary to ensure the aircraft is longitudinally stable.
17      Slowly operate the jacks at the same time to keep the aircraft level until the appropriate clearance is achieved between the main landing gear wheels and the ground.
18      Ensure that throughout the jacking operations the jack Safety Locking Collars are kept approximately 2.5 cms clear of the jack body.
19      On completion of all jack raising operations the aircraft should be levelled to the ‘datum position’, the jack Safety Locking Collars tightened and the aircraft made stable by the fitting of trestles or a safety stay.


Gavin Eron said...

Why should brakes be left "off" for raising and lowering the aircraft.??

Mark Broomfield said...

Hello, I am looking for information on how dillon force gauges and ap dynamometers are used in aviation maintenance. Any help is greatly appreciated.


Unknown said...

This article was really useful for understanding what aircraft jacks do. I remember when I was at the airport park and wait, from the spot that I was sitting I could the planes landing and taking off. It was so interesting watching the parts move. You did a great job of explaining.

Elizabeth J. Neal said...

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Unknown said...

I'm afraid that you are incorrect here. Releasing the brakes and removing the chocks will allow the aircraft to 'roll up' and prevent the U/C jumping when raising. It is in fact dangerous to leave chocks and brakes applied here. You have also NOT mentioned the removal of power cables or bonding leads too.

Yasantha Pathirana said...

I am afraid if you are really involved in aviation Maintenence, because you did not read everything carefully and simply argued on. Please pay close attention to point #10 where it says “ just taking little of the aircraft weight” which implies that wheels are just touching the ground with very less load on them and almost all the weight is now supported by jacks.

Also notice point #7 ,#14 & #15 which shows how the surroundings must be made clear with no or least external connections.

It’s important to read fully and with clear understanding, however please not that this is a general procedure for reference only, always refer to relevant AMM chapters for exact procedure and steps.

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