ATA 07 – LIFTING AND SHORING
- Jacking for – Aircraft Maintenance Operations
- Lifting at ALL Jacking Points
- Lifting at FWD Jacking Point only
- Lowering Procedure
- Jacking for – Wheel Change
- NLG
- MLG
- Shoring of the Aircraft
- JACK ADAPTER – Nose (Fuselage)
- JACKING PADS – Both Wings
- Jacking pads have to be used under the jacking points to spread the loads.
- In any condition, the aircraft must be pointed upwind.
- To make sure that excessive side loads are not placed on the jacks and on the aircraft structure, a quick leveling check must be carried out during the jacking operation.
JACKING FOR A/C MAINTENANCE OPERATIONS
- Fuel must be equal in LH & RH tank.
- Landing gear safety devices – Installed.
- Parking Brake – OFF
- Chocks – OUT
- No work in progress.
- Proper Equipment – Ensure.
- Don’t Lift the aircraft with Safety Stay.
- Don’t use Safety Stay when the aircraft is on its wheel.
- Safety stay prevents the accidental movement of the aircraft.
- Jack Load Rating – Check
- Aircraft must be stable.
- Make sure that the aircraft is level with: (AMM procedures)
- A spirit level in the forward cargo compartment, or
- A spirit level in the passenger compartment, or
- Using MCDU – ADIRU Pitch & Roll Angles, through alpha call-up codes.
- Wind condition – Check and Ensure.
- Apply general-purpose grease on the Jack adapter and pads.
- Load measurement:
- Load on the fittings must be measured by the Load Cells installed between the jacks and the fittings.
- If the jack has a load indicator, the load cell is not necessary.
- Load on the safety stay must be measured by the DYNAMOMETER-SAFETY STAY between the Safety Stay and the Fitting.
- Jacking without load cells – alternate procedure, but having limitations – see AMM.
- Jacking without load cells is not permitted out of the hangar.
- If it is necessary to do the landing gear extension/retraction tests, make sure that you remove the safety stay before the tests.
- The aircraft structure moves lightly during the extension/retraction test.
- Maintain a safety area line – of 10 feet, to prevent unwanted persons or equipment in the jacking area.
- We can lift the aircraft at the forward jacking point only, with the wheels of the MLG on the ground – Separate AMM Procedures.
- Check for the Flight Configuration Precautions because some systems sense flight mode.
LOWERING
- Parking Brake – OFF
- Extend the jack rams by 10 mm to release the locknuts.
- Loosen the jack locknuts by 100 mm (Approx 4 inches).
LIFTING AT FWD JACKING POINT ONLY
- MLG wheel chocks – IN (maintain approx 25mm clearance b/w chock & wheel)
- NLG wheel chocks – OUT
- If only one engine is installed – it is not permitted to lift the aircraft at the nose jacking point only.
- If the engines are not installed on the aircraft, do a full refueling of the center tank before the lifting, and make sure that the aircraft is stable.
- If the safety stay is in position, make sure that you remove it before you start to lift the aircraft.
- Damage to the fuselage can occur if you lift the aircraft with the safety stay in position.
- If it is necessary to do the nose landing gear extension/retraction tests, make sure that you remove the safety stay before the tests.
- The aircraft structure moves lightly during the extension/retraction test.
LIFTING FOR WHEEL CHANGE
- >> WHEEL CHANGE AXLE JACK
- >> Lift – 1 inch
- Wheels – on the aircraft axis.
- Aircraft – clear to lift.
- Safety devices – installed
- Parking brake – OFF
- Aircraft – Stable
- Can be lifted while cargo loading/unloading, fueling/defueling, and passenger boarding/disembarking – with precautions.
- Changing wheel chock – OUT
- Not-changing wheel chocks – IN
SHORING OF THE AIRCRAFT
- Shoring is necessary to give support to the wing in order to release the loads on the structure when you do major work or modifications.
- The AMM shoring procedure gives the general principle only.
- Use the detailed shoring instructions given in – SRM.
