S 212-049
(8) Do the inspection of the Nose Gear Axle (AMM 32-21-71/601).
(a)
Visually examine the wheel bearing washer, axle nut, and inner wheel bearing spacer for scoring or other damage. 1) Replace or repair the components when it is necessary.
(b)
Examine the axle for damage. 1) Examine for scoring or discoloration of the crome plated bearing lands on the axle. 2) Examine the light gray hydraulic fluid resistant paint on the axle for a brown shade caused when it becomes too hot.
3) Examine the green primer on the inner surfaces (bore) of the axle with a borescope. a) Use the borescope to a minimum depth of 7 inches and
look for discoloration or blistering b) The green primer will turn to a light brown or black color when it becomes too hot.
NOTE: If the paint shows only a small discoloration,
____ you can do the heat damage inspection when the airplane goes back to the primary base. Do not make a landing more than three times before you do this inspection.
S 212-050
(9) If signs of heat damage are found in the above steps, do the Heat Damage Inspection (AMM 05-51-07/201).
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737-300/400/500MAINTENANCE MANUAL
S 352-051
(10) Replace or repair the damaged components as follows:
(a) If the cadmium plate on the axle bore shows signs of heat damage.
NOTE: Heat damage to the cadmium plate can cause cadmium
____ embrittlement of the steel substrate.
(b) If the crome plate on the outer part of the axle shows signs of heat damage.
E. Put the airplane back to its usual condition.
S 412-052
(1) Install all components that were removed.
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737-300/400/500MAINTENANCE MANUAL
OVERWEIGHT TAXI CONDITION (CONDITIONAL INSPECTION) -
__________________________________________________ MAINTENANCE PRACTICES
_____________________
1. General_______
A. Overweight Taxi is defined as taxiing at a weight that is more than the maximum-design-taxi-weight (MTW).
(1) Before flight, you must decrease airplane weight to that specified by the Airplane Flight Manual for takeoff.
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. If the Phase 1 inspection shows any sign 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
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