25-01-2013, 09:32 AM
CHECKING VERTICALITY OF FIN
CHECKING VERTICALITY.docx (Size: 15.08 KB / Downloads: 26)
AIM
To ensure the fin verticality/directional stability of pushpak aircraft
THEORY
The fin is designed to provide the directional stability and control of aircraft. The conventional aero plane have a single fin, while the other type may have twin/multi fin as per rate
OCCASION
On erection/assemble of aircraft
Flight control smogs which affects the directional control
REQUIREMNTS
Working hours=3 hrs
Man power=3+1
Document=aircraft maintenance manual
PRECAUTIONS
Refer aircraft maintenance manual, ensure the capacity surroundings of aircraft
The jacking area should be free
Observe all safety procedure for leveling
Check the accuracy of spirit level
Always finish leveling procedure only by checking the longitudinal level without any adjustment
PROCEDURE
METHOD:1
Ensure that the aircraft is properly in level position
Measure the specified distance between the fin top/rudder hinge and elevator outer hinge/tail plore tip by using measuring tape
While using measuring tape pre load it by 3 to 5 Kg to provide desired toughness
The measured distance between port and starboard wing must be equal and same as mentioned in rigging chart
METHOD:2
Level the aircraft
Drop the plumb bob from the tail centre and then mark on the ground by a chalk
Drop the plumb bob from the each side tail plane and make it on the ground
Measure the marked distance
Take the height of fin from the horizontal plane
The diagonal distance may be calculated based on Phythagoras theorem
Compare it, finally
RESULT
The measured distance in both the method is found within limit and fin vertically is found and assured