25-01-2013, 09:20 AM
LEVELLING OF PUSHPAK AIRCRAFT
LEVELLING.docx (Size: 13.29 KB / Downloads: 20)
AIM
To level the aircraft for inspection purpose
LEVELING
Leveling is the process of placing an aircraft in its rigging position by means of hydraulic or screw jacks
The rigging position is the position of the aircraft at which longitudinal and lateral axis are parallel to ground.
Leveling means leveling the aircraft in the horizontal position for rigging. There are three types of leveling. They are as follows
• Straight edge method
• Grid plate method
• Engineers transmit method
OCCASION
During replacement or renewal of major components, rigging checks, symmetry checks and as when DGCA require leveling process is carried out.
REQUIREMENTS
Man hours = 3 hrs
Man power= 3+1
Documents= Aircraft maintenance manual
TOOLS REQUIREMENT
Tripod screw/hydraulic jack
Spirit level [adjustable/fixed]
Leveling boards
Tail trestles[fixed/adjustable]
PRECAUTION
Observe on safety precautions for jack up
Check the accuracy of spirit level
Always finish leveling procedure once by checking the [longitudinal level without any adjustment]
PROCEDURE
Place the main jack below the undercarriage near the fuselage
Place the trestle of the specified station by lifting the tail unit
Place the longitudinal leveling board at both side of cockpit
Place the lateral leveling board at rear of the slats
Place the spirit level over it and adjust main jack till the bubble of spirit level is brought in centre
Recheck the longitudinal level
If the bubble is in the centre in both the spirit level, the aircraft is considered to be brought into level condition
If not, then repeat the operation from step 3 to 7
CONCLUSION
Thus the aircraft is leveled and is made ready for further checks