(7)
51-21-161/701, Heat, Weather and Oil Resistant Protective Coating
Cleaning/Painting
C.
High Energy Stop Conditional Inspection - In CAUTION Range
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May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 5-51-111 Page 201
WARNING: DO NOT GO NEAR THE LANDING GEAR AREA FOR 1 HOUR AFTER THE AIRPLANE HAS MADE A HIGH ENERGY STOP. INJURY TO PERSONS CAN OCCUR.
(1)
Move the airplane away from the runway in use.
(a)
Do not use the brakes very much when the airplane is moved.
(b)
Do not set the parking brake.
(2)
Let the brakes, tires, and wheels cool so you can touch them.
(3)
Examine the wheels and tires on axles where the wheel fuse plug did not melt per AMM 32-45-00/601.
(4)
Examine the brakes on the axles where the wheel fuse plugs did not melt per AMM 32-41-41/601.
(5)
Examine the brakes (Ref 32-41-41/601).
(a) Apply the brakes fully five or six times. Monitor the brake operation and look for hydraulic leaks during brake application.
NOTE: Make sure the brakes work properly. Look at the movement of the brake indicator wear pins.
D. High Energy Stop Conditional Inspection - In FUSE PLUG MELT Range
(1)
Move the airplane away from the runway in use immediately because the tires will possibly deflate.
(a)
Do not use the brakes very much when the airplane is moved.
(b)
do not set the parking brake.
WARNING: DO NOT GO NEAR THE LANDING GEAR AREA FOR 1 HOUR AFTER THE AIRPLANE HAS MADE A HIGH ENERGY STOP, UNLESS IT IS NECESSARY. IF IT IS NECESSARY, GO NEAR THE AREA VERY CAREFULLY, BUT ONLY FROM THE FRONT OR REAR OF THE TIRES. INJURY TO PERSONS CAN OCCUR.
(c)
Tell the fire department persons that the types of fires that follow could occur: 1) Hydraulic fluid 2) Grease 3) Tires
WARNING: DO NOT SPRAY EXTINGUISHER OR COOLANT DIRECTLY ON THE INFLATED TIRE OR WHEEL. AN EXPLOSION CAN BE CAUSED AND INJURY TO PERSONS CAN OCCUR.
(d)
After 1 hour, use fog or foam to cool the wheel and tire. Or wait 2 to 3 hours for brakes to cool so they can be touched.
(2)
Examine the tires on the axles where all tires and wheel assemblies are inflated (Ref 32-45-00/601).
(3)
Examine the wheels on the axles where all tires and wheel assemblies are inflated (Ref 32-45-00/601).
(4)
Examine the brakes on the axles where all tires and wheel assemblies are inflated (Ref 32-41-41/601).
(5)
Remove the wheels and tires on the axles where the tire(s) are deflated. Do this after the landing gear wheels and tires are cool and safe to go near. Have wheels and tires inspected per the supplier's recommended procedures.
(6)
Remove the brakes on axles where the tire(s) are deflated. Have the brakes inspected per the supplier's recommended procedure.
(7)
Examine the Main Landing Gear
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NOTE: If heat damage is apparent in the steps that follow, do the Heat Damage Inspection procedure.
(a)
Examine the heat-resistant coating on the brake mounting flanges, and on the lower torsion links for signs of blistering and melting.
NOTE: A heat-resistant coating is used on the brake mounting flanges, on the axles in the areas of brake mounting flanges and on the sleeves. The hydraulic fluid-resistant paint finish will have burned away in most cases. The heat-resistant coating is a greenish gray color. For application of the heat-resistant coating, refer to AMM 51-21-161/701.
(b)
Examine the hydraulic fluid-resistant paint on the axles and the lower end of the inner shock strut cylinder. Look for a brown shade that was caused by an overheat condition.
CAUTION: DO NOT PERFORM THE FIELD HARDNESS TEST ON THE VERTICAL FACES OF THE BRAKE MOUNTING FLANGES OR OTHER PARTS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE AIRPLANE CAN OCCUR.
(c)
If the examination in step (a) shows that coating has blistered and step (b) shows that parts have been overheated, remove the parts for a hardness test.
NOTE: A field hardness test may be done with a portable hardness tester on the outside rim of steel brake mounting flanges. Do this only if the mounting flanges are heat-treated to 270-300 ksi.
(d)
If the examination in step (a) shows that coating has melted, inspect for evidence of embrittlement or cracking. Use the fluorescent magnetic particle inspection technique. Additional hand polishing and visual inspection techniques can be used as necessary. For approved repairs, refer to AMM 32-11-111/801.
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