(4)
Check hydraulic fluid-resistant paint on axles and lower end of inner cylinder for a brown shade due to overheating.
(5)
If check (3) shows that cadmium has blistered and check (4) shows that parts have been overheated, remove parts for hardness test. On airplanes with heat-resistant coating, a field hardness test may be conducted with a portable hardness tester on the outside rim of the steel brake mounting flanges which are heat-treated to 270-300 ksi.
CAUTION: DO NOT SUBJECT THE VERTICAL FACES OF THE BRAKE MOUNTING FLANGES OR ANY OTHER PART TO THE FIELD HARDNESS TEST.
(6)
If check (3) shows that cadmium has melted, inspect for evidence of cadmium embrittlement or cracking, using fluorescent magnetic particle inspection technique. Additional hand polishing and visual inspection techniques may be used as required.
(7)
Shot peen brake mounting flanges and adjacent axle areas following fuse plug melting. Shot peening to be accomplished as soon as convenient, but not later than landing gear overhaul.
B. Check tires and wheels for damage (Ref 32-45-0, Inspection/Check).
C. Check main gear brakes (Ref 32-41-41, Inspection/Check).
500
Feb 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 5-51-101 Page 201
HIGH ENERGY STOP/HEAT DAMAGE CONDITION - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
1. High Energy Stop
A. This section gives an examination procedure for landing gear cylinders, wheels, and brakes after a high energy stop condition. The extent of the examination depends on the level of absorbed kinetic energy.
B. The approximate energy absorbed by a brake unit can be found by the use of the brake energy chart (Fig. 201). Use of the chart will provide only an approximation of the energy absorbed during the stop. The factors that follow will also affect the energy absorbed:
(1)
Residual energy from the previous stop
(2)
The runway slope
(3)
The wind conditions
(4)
Thrust reverser use.
C. Approximate energy absorbed by a brake example, with the use of Fig. 201, is as follows:
(1)
Landing Gross weight -91,000 pounds (41,278 kg)
(2)
Brakes on Speed - 120 knots (no wind)
(3)
Pressure Altitude - 5000 ft
(4)
Outside Air Temperature -86 Degrees F (30 deg C)
(5)
Normal Landing Stop Using Auto Brake Setting 2
(6)
Normal Reverse, Number 2 Detent
(7)
No Taxi Distance
(8)
Resultant Brake Energy -8.2 million foot-pounds
(9)
Resultant is in the COOLING RECOMMENDED range
D. A high energy condition can be a refused takeoff. It can slso be any stop or sequence of stops that collects energy. An indication that a high energy stop, or euivalent, has been made is the release of a wheel fuse plug. Energy levels can be different between brakes.
2. High Energy Stop
WARNING: THE POWER CABLE OF THE BORESCOPE MUST BE IN GOOD CONDITION. IF THERE ARE ANY CIRCUMFERENTIAL CUTS, FRAYED AREAS, OR RUPTURES TO THE EXTERNAL RUBBER COVER OF THE CABLE, INJURY TO PERSONS CAN OCCUR.
(1)
Borescope - Fiber Optic Light Supply - Model BLS-97, American Cystoscope Makers Inc., Industrial Division, Pelham, New York
(2)
Borescope - Fiber Optic Light Supply - Model BLS-98, American Cystoscope Makers Inc., Industrial Division, Pelham, New York
(3)
Rigid Borescope - Model BFO-3920A, American Cystoscope Makers Inc., Industrial Division, Pelham, New York
(4)
Flexible Borescope - Model BF1F-3127DD, Cystoscope Makers Inc., Industrial Division, Pelham, New York
(5)
Fiber Light Carrier - Model FO-400 5A, Cystoscope Makers Inc., Industrial Division, Pelham, New York
(6)
Rigid Borescope - Model FIB 730, Richard Wolf Medical Instruments Corp., Rosemont, Illinois
(7)
Rigid Borescope - Model FIB 740, Richard Wolf Medical Instruments Corp., Rosemont, Illinois
(8)
Rigid Borescope - Model FIB 760, Richard Wolf Medical Instruments Corp., Rosemont, Illinois
B.
References
(1)
32-11-111/801, Axle - Approved Repairs
(2)
32-41-41/401, Main Gear Wheel Brake - Removal/Installation
(3)
32-41-41/601, Main Gear Wheel Brake - Inspection/Check
(4)
32-42-11/401, Antiskid Transducer - Removal/Installation
(5)
32-45-00/601, Tires - Inspection/Check
(6)
32-45-11/401, Main Gear Tire and Wheel - Removal/Installation
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