Discoloration is green primer that has turned brown or black and/or enamel turned yellow, brown, or black.
1) The outer diameter of the axle sleeve 2) The outer diameter of the axle through the holes and slots in the axle sleeve 3) The inner diameter of the axle
WARNING: THE POWER CABLE OF THE BORESCOPE MUST BE IN A
_______ GOOD CONDITION. IF THERE ARE CIRCUMFERENTIAL CUTS, FRAYED AREAS, OR RUPTURES TO THE EXTERNAL RUBBER COVER OF THE CABLE, INJURY TO PERSONS CAN OCCUR.
a) Examine the green primer on the inner surfaces (bore)
of the axle with a borescope. 4) The brake sleeve (Ref 32-41-15/601). 5) If no damage, discoloration/blistering is found, you can
leave the axle in service as it is.
NOTE: No further inspections to the axle are necessary.
____
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(d)
(e)
(f)
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747-400 MAINTENANCE MANUAL
6) Apply grease/CIC to the axle inner diameter.
7) Install the components that follow: a) The brake assembly (AMM 32-41-15/401) b) The anti-skid system (AMM 32-42-04/401) c) The wheel interface unit for the tire pressure
indicating system, if it is installed
(AMM 32-45-11/401)
d) The wheel and tire assembly (AMM 32-45-01/401).If damage to the axle is found, remove and replace the axle.If discoloration/blistering on the axle OD or ID, or damage to the axle sleeve or brake is found, do the step that follows:
NOTE: If discoloration or blistering on the ID of the axle is
____ found, and it is not practical to do the Ammonium Persulfate Etch Inspection on the airplane, remove and replace the axle. If no cadmium plate damage is found, repair the axle per the OHM 32-00-05. If cadmium plate damage is found, discard the axle.
1) Remove the axle sleeve or brake sleeve and repair the
sleeves as necessary.If the paint/primer shows only a small discoloration on the OD and ID of the axle do the heat damage inspection when the airplane goes back to the primary base.
NOTE: Do not land the the airplane more than three times
____ before you do the complete inspection.
1) Install the components that follow: a) The brake assembly (AMM 32-41-15/401) b) The wheel speed transducer (AMM 32-42-04/401) c) The wheel interface unit of the tire pressure
indicating system (TPIS) if it was installed (AMM 32-45-11/401)
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747-400 MAINTENANCE MANUAL
d) The wheel and tire assembly (AMM 32-45-01/401).
(g) Locally strip off the discolored or blistered paint and examine the cadmium (or cadmium/titanium) plating.
NOTE: Such damage can cause cadmium embrittlement of the steel
____ substrate. The damage is not always found by non-destructive tests such as ammonium persulphate etch.
1) Examine the cadmium (or cadmium/titanium) plating.
NOTE: Such damage can cause cadmium embrittlement of the
____ steel substrate. The damage is not always found by non-destructive tests such as ammonium persulphate etch.
a) Look for a white oxide material, and blistered or melted (balled up) cadmium plating. 2) If the plating shows signs of heat damage, replace the axle.
NOTE: Cadmium embrittlement of the axle cannot be
____ eliminated through overhaul methods. Boeing suggest the axle be discarded.
3) If the cadmium plating no signs of heat damage, do the Ammonium Persulfate Etch Inspection.
G. Nose Landing gear (NLG) Axle Inspection
S 212-052
(1) Do an inspection of the nose landing gear axle.
(a)
Visually examine the parts that follow for scoring or other damage: 1) The wheel bearing washer 2) The axle nut 3) The inner wheel bearing spacer.
(b)
Repair or replace the components when it is necessary.
(c)
Examine the axle for damage. 1) Remove the grease or corrosion inhibitive compound (CIC) from the ID of the axle.
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