(h)
Examine for broken or loose lockwires.
(i)
Make sure the mounting clamps for the accessory component (the QAD) are attached correctly and have no damage.
S 216-056-N00
(4)
Examine each external fuel hydraulic tube.
(a)
Examine the tubes for nicks, worn areas, scratches, and pitting.
NOTE: Pitting is a concentration of corrosion at a location.
____
1) Damage that is no more than 0.002 inch (0.051 mm) in depth is permitted all along the tube length; this includes the tube bend area.
(b) Examine the tubes for dents.
1) Dents that are less than 0.250 inch (6.350 mm) from the ferrules are not permitted.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 2 - Inlet, Exhaust, and Externals Inspection
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2) Tube dents without sharp edges are permitted if the inner diameter of the tube is decreased by less than 10 percent.
NOTE: To do this check, use a ball that has a diameter
____ that is 90 percent of the inner diameter of the tube. Try to put this ball through the tube. Tubes in which the ball gets caught are not permitted.
(c)
Examine the tubes for corrosion and stains.
1) Corrosion and stain are permitted if you can lightly polish the damaged area with a crocus cloth and remove the damage.
(d)
Do a pressure test on the tubes. 1) Pressurize the tubes to 1500 psi (10342.1 kPa); Refer to
the Standard Practices Manual.
2) If the tube has leaks, replace it.
S 216-057-N00
(5)
Examine each external tube of the oil system.
(a)
Examine the tubes for nicks, worn areas, scratches, and pitting.
NOTE: Pitting is a concentration of corrosion at a location.
____
1) Damage that is no more than 0.003 inch (0.076 mm) in depth is permitted all along the tube length; this includes the tube bend area.
(b) Examine the tube for dents. 1) Dents that are less than 0.250 inch (6.350 mm) from the ferrules are not permitted.
2) Tube dents without sharp edges are permitted if the inner diameter of the tube is decreased by less than 20 percent.
NOTE: To do this check, use a ball that has a diameter
____ that is 80 percent of the inner diameter of the tube. Try to put this ball through the tube. Tubes in which the ball gets caught are not permitted.
(c) Examine the tubes for corrosion and stains.
1) Corrosion and stains are permitted if you can lightly polish the damaged area with a crocus cloth and remove the damage.
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No. 2 - Inlet, Exhaust, and Externals Inspection
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S 216-058-N00
(6)
Examine each external tube of the fuel system.
(a)
Examine the tubes for nicks, worn areas, scratches, and pitting.
NOTE: Pitting is a concentration of corrosion at a location.
____
1) Damage that is no more than 0.002 inch (0.051 mm) in depth is permitted all along the tube length; this includes the tube bend area.
(b) Examine the tubes for dents. 1) Dents that are less than 0.250 in. (6.350 mm) from the ferrules are not permitted.
2) Tube dents without sharp edges are permitted if the inner diameter of the tube is decreased by less than 10 percent.
NOTE: To do this check, use a ball that has a diameter
____ that is 90 percent of the inner diameter of the tube. Try to put this ball through the tube. Tubes in which the ball gets caught are not permitted.
(c)
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