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05-51-10
ALL ú ú 01 Page 202 ú Dec 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
HIGH ENERGY STOP/HEAT DAMAGE CONDITION - MAINTENANCE PRACTICES
______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
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. The approximate energy absorbed with the use of Fig. 201 is shown in the example that follows:
(1)
Gross Weight - 175,000 pounds (79,550 kg)
(2)
Brakes on Speed - 104 knots (no wind)
(3)
Normal Landing Stop Using Auto Brake Setting Number 3.
(4)
Pressure Altitude - 2000 ft
(5)
Outside Air Temperature - 86°F (30°C)
(6)
Taxi Distance - 1 mile
(7)
No Reversers
(8)
Resultant Brake Energy - 10.2 million foot-pounds
(9)
Resultant is in the COOLING RECOMMENDED range
D. ON GUN 051; the Brake Temperature Monitoring System (Ref 32-46-00) shows a white BRAKE TEMP light or a reading of 3 to 6 on the EICAS CRT panel. It shows that caution is required to prevent too much energy on subsequent ground operations. It does not show that high energy is there.
E. A high energy condition can be a refused takeoff. It can also be any stop or sequence of stops that collects energy in the CAUTION range (Fig. 201). An indication that a high energy stop, or equivalent, has been made is the release of a wheel fuse plug. Energy levels are different between brakes after stops in the COOLING RECOMMENDED range. One or more brakes could have absorbed energy in the CAUTION range, and one or more wheel fuse plugs released.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
05-51-14
ALL ú ú 03 Page 201 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
F. On the Brake Temperature Monitoring System (Ref 32-46-00), an indication of 7 or above on the EICAS panel (Ref 31-41-00) is unsatisfactory. It shows a high temperature condition which will make an inspection necessary.
TASK 05-51-14-212-001
2. High Energy Stop________________
A. Equipment
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,
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