S 422-010
(9)
Install the brake assembly (AMM 32-41-15/401).
(10)
Install the wheel assembly (AMM 32-45-01/401).
S 612-012
(11)
Do the servicing procedure for the main landing gear struts (AMM 12-15-03/301).
S 422-011
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
HIGH ENERGY STOP/HEAT DAMAGE CONDITION - MAINTENANCE PRACTICES
______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
A. This section gives an inspection procedure for landing gear cylinders, wheels, and brakes after a high energy stop condition. The level of these inspections are found by the level of absorbed kinetic energy.
NOTE: If an EICAS brake temperature monitor indication of 5 or a
____ BRK TEMP message occurs, the energy present will not always cause the wheel fuses to release. Treat the condition as a high energy stop within the caution range as in par. 2.D.
If fuse releases do occur, treat the condition as in par. 2.E.
B. The approximate energy absorbed by a brake unit can be found on the brake energy chart (Fig 201). The the chart will give only an approximation of the energy absorbed during the stop. The items that follow will also affect the energy absorbed.
(1)
Residual energy from a previous stop
(2)
The runway slope
(3)
The wind condition
(4)
Braking during the airplane taxi
(5)
Thrust reverser use.
(6)
A calculated example or energy absorbed by a brake with the use of Figure 201, and not EICAS is as follows:
(a)
Gross Weight - 560,000 pounds (255,000 kgs)
(b)
Brakes on Speed - 110 knots (no wind)
(c)
Normal Landing Stop
(d)
Pressure Altitude - 5,000 feet
(e)
Outside Air Temperature - 86°F (30°C)
(f)
No Reversers
(g)
Resultant Brake Energy - 22 million foot-pounds
(h)
Resultant is in the COOLING RECOMMENDED range.
C. The EICAS brake temperature monitor that reads the hottest brake can be used. This is an alternative to the other data on the brake energy chart (Figure 201). EICAS will automatically read the taxi brake temperature residual energy, and other factors that were given before.
NOTE: Example (Fig 201):
____ The highest EICAS brake temperature monitor reading = 3. Resultant is in the cooling recommended range.
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ALL ú ú 01 Page 201 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
KG LB
400
GUIDANCE INFORMATION ONLY
380
360
340
320
300
OBSERVE MAXIMUM QUICK
TURN-AROUND LIMITATION TO CORRECT FOR WIND
ENTER CHART WITH BRAKES ON SPEED MINUS ONE-HALF THE HEADWIND OR PLUS 1.5 TIMES THE TAILWIND.
CHART DOES NOT CONSIDER BENEFIT OF REVERSE THRUST.
CHART SHOWS ENERGY PER BRAKE ADDED BY A SINGLE STOP WITH ALL BRAKES OPER-
ATING. ENERGY IS ASSUMED TO BE EQUALLY DISTRIBUTED AMONG THE OPERATING BRAKES. TOTAL ENERGY IS SUM OF RESIDUAL ENERGY PLUS ENERGY ADDED.
PER BRAKE FOR EACH TAXI MILE.
COOLING SCHEDULEEVENT OATPRESS ALT GROSS WEIGHT
280
260
240
FOR ONE BRAKE DEACTIVATED
INCREASE ENERGY PER BRAKE BY 7 PERCENT.
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