B. Inspection Criteria; An immediate structural inspection is necessary if you:
(1)
Taxi the airplane overweight by more than 1/2% of the maximum-taxi-weight (MTW).
(2)
Taxi the airplane overweight at any weight over the Maximum Design Taxi Weight (MTW) and have any of these conditions:
(a)
High speed ground turn
(b)
Sharp radius turn
(c)
Heavy braking
(d)
Taxi over rough pavement
(e)
Pivoting (sharp radius turning with brakes on).
(3)
If the criteria for the above paragraphs have not been met, no inspection is necessary.
(a) But, you must decrease the airplane weight to that specified by the Airplane Flight Manual before takeoff.
C. The Inspections
(1)
The inspection is divided into Phases 1 and 2.
(2)
If the inspection for Phase 1 shows no signs of damage, the inspection is complete.
(3)
If the Phase 1 inspection shows signs of damage, the Phase 2 inspection must be done.
D. Inspections, Repairs, and Replacements
(1) When this procedure tells you to "examine" a part, look for these conditions:
-cracks
-structure that pulled apart
-loose paint (paint flakes)
-twisted parts (distortion)
-bent parts
-wrinkles or buckles in structure
-fastener holes that became larger or longer
-loose fasteners
-missing fasteners (fasteners that have pulled out or are gone)
-delaminations (a component with one or more layers pulled apart)
-parts that are not aligned correctly
-interference (clearance that is not sufficient between two parts)
-discoloration (heat damage)
-nicks or gouges
- other signs of damage.
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05-51-07
ALL ú ú 01 Page 201 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(2) Replace or repair the components that have one or more of the conditions given above.
TASK 05-51-07-212-001
2. Phase 1 Inspection
__________________
A. Airplane Inspection
S 212-002
(1) Do the inspection of the body, wing, and nose landing gear.
(a)
Examine all tires and wheels.
(b)
Examine the support structure.
(c)
Look for signs of fluid leakage at the top and bottom of the outer cylinder of the shock strut.
NOTE: A small quantity of hydraulic fluid on the surface of
____ the inner cylinder of the shock strut is satisfactory.
(d) Examine the truck beams (body and wing landing gear).
S 212-003
(2) Do the inspection of the landing gear, fuselage, and wing.
(a) Look for fuel leaks, and other fluid leaks, in the areas that follow: 1) all wheel well areas of the body, wing, and nose landing
gear 2) the lower external surface of the fuselage in the area of the wing-to-body fairing 3) the wing.
TASK 05-51-07-212-004
3. Phase 2 Inspection
__________________
A. References
(1)
AMM 07-11-01/201, Jacking Airplane
(2)
AMM 12-15-03/301, Wing Gear Shock Strut
(3)
AMM 12-15-04/301, Body Gear Shock Strut
(4)
AMM 12-15-05/301, Nose Gear Shock Strut
(5)
AMM 32-11-01/601, Wing Gear
(6)
AMM 32-11-02/401, Wing Gear Shock Strut
(7)
AMM 32-13-02/401, Body Gear Shock Strut
(8)
AMM 32-21-01/401, Nose Landing Gear
(9)
AMM 32-21-01/601, Nose Landing Gear
(10)
AMM 32-21-01/401, Nose Landing Gear
(11)
AMM 32-32-00/501, Wing Gear and Door Extension and Retraction
(12)
AMM 32-33-00/501, Body Gear and Door Extension and Retraction
(13)
AMM 32-34-00/501, Nose Gear and Door Extension and Retraction
(14)
AMM 32-41-15/601, Landing Gear Break Unit
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