COOLING SCHEDULE
I. NORMAL: NO SPECIAL PROCEDURE REQUIRED.
II. COOLING RECOMMENDED: COOL AS SCHEDULED. GROUND COOLING
SCHEDULE RECOMMENDED PRIOR TO TAKEOFF.
_______ DELAY TAKEOFF AND INSPECT
III. CAUTION: WHEEL FUSE PLUGS MAY MELT. AFTER 30 MINUTES. AFTER TAKEOFF, EXTEND THE GEAR SOON FOR AT LEAST 7 MINUTES.
IV. FUSE PLUG MELT: NO REVERSE THRUST OR BRAKING CONFIG CREDIT ALLOWED IN THIS AREA. CLEAR RUNWAY IMMEDIATELY. DO NOT SET PARKING BRAKE. DO NOT APPROACH GEAR OR ATTEMPT TAXI OR SUBSEQUENT TAKEOFF BEFORE WAITING MANDATORY TIME SHOWN ON QUICK TURNAROUND LIMIT CHART. ALERT FIRE EQUIPMENT.
Brake Cooling Schedule
Figure 201 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
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 32-11-85/801.
(e)
Shot-peen the brake mounting flanges and the adjacent axle areas after a fuse plug has melted. Do the shot-peen when schedules permit, but not later than the landing gear overhaul.
S 022-015
(8)
Remove the antiskid transducers (Ref 32-42-11/401).
S 292-016
(9)
Examine the paint (green primer or light gray enamel) on the inner surfaces (bore) of the axle with a borescope. Use the borescope to a minimum depth of 16 inches. Look for discoloration or blistering.
(a)
Green paint will change to a light brown or black color.
(b)
Light gray paint will change to a yellow color.
(c)
If the plating shows signs of heat damage, do the heat damage inspection procedure.
(d)
If the paint shows only a small discoloration, more heat damage inspections can wait. Do the last part of the inspection when the airplane gets back to the primary base. Do not land more than three times before you do this inspection.
TASK 05-51-07-212-017
3. Heat Damage Inspection
______________________
A. General
(1) This inspection is used to find if the high strength steel that showed signs of heat damage, had changed. It will look for a change in the temper or heat treat properties.
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B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
WARNING: DO NOT BREATHE THE VAPORS OF THE SOLVENTS OR ETCH SOLUTIONS.
_______ DO NOT GET THEM IN YOUR EYES, ON YOUR SKIN OR ON YOUR CLOTHES. INJURY TO PERSONS MAY OCCUR.
(2)
This inspection will usually occur on the components of the landing gear axles. The signs of discolored or blistered paint or plating shows that a general intense heat has changed the temper of the axle. When this happens, the ammonium persulphate procedure should be applied to the damaged part of the axle. Do this procedure after the axles have been reworked. Axle rework procedures can be found in Chapter 32, Landing Gear.
Consumable Materials
(1)
Air - Clean, dry, compressed
(2)
Ammonium persulphate etch solution
(a) 100 grams of ammonium persulphate per 0.27 gallon of tap water 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 TIME LIMITS/MAINTENANCE CHE(7)
