25-01-2013, 09:29 AM
CHECKING PROCEDURE OF WING SWEEP ANGLE OF PUSHPAK AIRCRAFT
SWEEP ANGLE.docx (Size: 14.84 KB / Downloads: 23)
AIM
To measure the wing sweep back angle to ensure retention of design flight characteristics
THEORY
Wing sweep back is the angular set back given to aircraft lateral axis along the longitudinal axis in order to improve the aircraft speed by reducing the compressibility drag
It is mostly done on high speed aircraft to improve flight characteristics
The sweep back of an aircraft is also the angle between a line perpendicular to fuselage centre line and ¼ th chord line of each wing aerofoil sections
OCCASIONS
On erection/assemble of new aircraft
As and when required by DGCA
REQUIREMENT
Man hours=3
Man power=3+1
Document= aircraft maintenance manual rigging chart/blue print
TOOLS AND EQUIPMENT REQUIRED
Tripod jack
Leveling board
Spirit level
Tail support and jack
Plumb bob
Measuring tape
Fitter square
PRECAUTIONS
Observe all safety precautions for jack up
Check the accuracy of spirit level
Always finish leveling procedure one by one checking the longitudinal level without any adjustment
PROCEDURE
Observe all safety precaution for jack up
Check the accuracy of spirit level
Level the aircraft by taking proper precaution and preparation
Drop the plumb bob from the spin centre to tail wheel centre and mark them by chalk on ground
Connect the points from spin centre to tail wheel and draw a line
Drop the plumb bob from leading edge inboard and outboard of either wing to longitudinal axis
Connect the dropping points of leading edge inboard and outboard of either wing to longitudinal axis
Use fitter square at the interaction of both lines which must be perpendicular to each other
This indicate that the sweep back angle of pushpak aircraft is zero degree
If found more or less than specified angle report to manufacturer
RESULT
The sweep back is measured and ensured the manufacture maintenance manual and rigging chart