(4)
AMM 32-45-02/401, Nose Landing Gear Tire/Wheel Assembly -Removal/Installation
(5)
AMM 32-45-11/401, Main Gear Tire Pressure Indication System -Removal/Installation
(6)
AMM 32-12-05/401, Nose gear Tire Pressure Indicating System -Removal/Installation
(7)
SOPM 20-10-02, Standard Overhaul Practices Manual - Examination for Heat Damage
C. Ammonium Persulphate Etch Inspection
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747-400 MAINTENANCE MANUAL
S 122-055
WARNING: DO NOT LET THE ETCHANT SOLUTION TOUCH THE CADMIUM PLATED
_______ SURFACES. POISONOUS FUMES CAN OCCUR AND CAUSE INJURY TO PERSONS.
(1) Do the Ammonium Persulfate Etch Inspection (SOPM 20-10-02).
(a) When you are not sure of the heat treat condition in the etched area, replace the axle.
NOTE: A metallurgist can help when you are not sure about the
____
results of the etch.
1) If the axle shows signs of retempering burns or reharding burns, replace the damaged axle.
NOTE: If you will repair the axle, refer to the OHM
____
32-00-05.
(b) When the axle is servicable, do the steps that follow: 1) Remove the etched material with alluminum-oxide or silicon-carbide abrasive cloth, 180 grit or finer. 2) Locally shot peen the area where the plating was removed (SOPM 20-10-03). 3) Stylus cadmium plate the area where the plating was removed
(SOPM 20-42-10). 4) Re-finish the axle with the correct primer and paint.
D. Airplanes original condition/configuration component installation instructions.
S 422-053
(1) Install the components that follow if they are servicable or install replacement parts:
(a) Install the main gear components that follow if it is applicable: 1) Install the brake sleeve and axle sleeve.
NOTE: To make sure the installation of the brake sleeve is
____ correct, use the temperature differential procedure in OHM 20-50-03.
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2) Install the brake assembly (AMM 32-41-15/401). 3) Install the wheel speed transducer (AMM 32-42-04/401). 4) Install the wheel interface unit for the tire pressure
indicating system (TPIS), if it is installed
(AMM 32-45-11/401). 5) Install the brake cooling fan motor if it was installed. 6) Install the MLG wheel and tire assembly (AMM 32-45-01/401).
(b) Install the nose gear components that follow if it is applicable: 1) Install the interface unit for the nose gear tire pressure
indicating system (AMM 32-45-02/401). 2) Install the NLG wheel and tire assembly (AMM 32-45-02/401).
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PRESSURE/DEICING DUCT FAILURE CONDITION - MAINTENANCE PRACTICES
_______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
A. One task is supplied in this procedure. The task is pressure/deicing duct failure conditional inspection.
TASK 05-51-18-202-001
2. Pressure/Deicing Duct Failure Conditional Inspection____________________________________________________
A. Procedure
S 212-002
(1) Examine the internal structure of the nacelle strut and wing leading edge for heat damage (i.e. Discoloration).
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