S 212-074
(10)
Examine the rear spar and the midspar for permanent buckles in the webs between wing station 467 rib and the side of the body.
S 212-035
(11)
Examine the refuel manifold between WS 359 and WS 386 side of body rib for buckles, cracks, distortion, or other signs of damage. Examine carefully the tubes 65B92605-9 or -15 LH and 65B92605-8 or -16 RH which are installed between WS 359 and WS 386.
NOTE: This inspection requires tank entry and should be
____ accomplished in conjunction with steps 2.B.(9) and 2.B.(10). Damaged refuel lines can cause inadvertent fuel transfer into inboard main during subsequent fueling operations.
S 212-047
(12) If signs of runway contact are found, examine these areas for breaks or distortion:
(a)
APU Firewall
(b)
APU Drain
(c)
APU Door
(d)
Outflow Valve
(e)
Drain Mast
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(f)
Lower Fuselage Skin
(g)
Stringers
(h)
Frames
(i)
Shear Ties
C. Examine the landing gear and landing gear structure.
S 212-076
(1) Examine the body landing gear.
(a)
Examine the body landing gear inner and outer cylinder lugs for cracks, and visible distortion.
(b)
Examine these items of the body landing gear for distortion, cracks, and/or other signs of distortion: 1) Body Landing Gear Side Strut Linkage 2) Body Landing Gear Side Struts 3) Body Landing Gear Drag Strut Linkage 4) Body Landing Gear Drag Struts 5) Body Landing Gear Side Strut Attachments (Body Station
1480) 6) Body Landing Gear Truck Positioning Mechanisim 7) Body Landing Gear Truck Positioning Linkage 8) Body Landing Gear Truck Beams
(c)
Examine the body landing gear drag strut support fitting for distortion, flaking paint, cracks, pulled fasteners, and fasteners which are not there.
(d)
Examine the body landing gear vertical trunnion support fittings and attachments at body station 1480 bulkhead. Look for distortion, flaking paint, cracks, pulled fasteners, and fasteners which are not there.
(e)
Examine all of the bolts and pin connections in the body landing gear for signs of distortion.
(f)
If body landing gear wheel removal is necessary because of blown tires, do these steps: 1) Examine the body landing gear wheel structure for cracks. 2) Examine the body landing gear brake assemblies for damage.
(g)
Do a check of the body landing gear shock strut fluid level.
S 212-077
(2) Examine the wing landing gear.
(a)
Examine the wing landing gear inner and outer cylinder lugs for cracks, and visible distortion.
(b)
Examine these items of the wing landing gear for distortion, cracks, and/or other signs of damage: 1) Wing Landing Gear Side Strut Linkage 2) Wing landing Gear Side Struts 3) Wing Landing Gear Drag Strut Linkage 4) Wing Landing Gear Drag Struts 5) Wing Landing Gear Side Strut Attachments (Body Station
1350) 6) Wing Landing Gear Truck Positioning Mechanisim 7) Wing Landing Gear Truck Positioning Linkage 8) Body Landing Gear Truck Beams
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747-400 MAINTENANCE MANUAL
(c)
Examine all of the bolts and pin connections in the wing landing gear for signs of distortion.
(d)
Examine these items for signs of cracks or deformation: 1) Wing Landing Gear Side Strut-to-Wing Attachments 2) Shear Bolts at the Side Strut Upper Link 3) Shear Bolts at the Side Strut Diagonal Brace
(e)
Examine the wing landing gear side strut support beam (FWD of Body Station 1350; WL 140) for local buckling, flaking paint, cracks, pulled fasteners, and fasteners which are not there.
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