(10)
With parking brake set, check for worn brake unit.
NOTE: Each brake has two brake wear indicator pins.
CAUTION: DO NOT LET THE BRAKE UNIT WEAR UNTIL THE RELINE INDICATOR PIN IS BELOW THE SURFACE. DAMAGE TO EQUIPMENT CAN OCCUR.
(a)
If the two wear indicator pins are missing, you must replace the brake prior to the next flight.
(b)
If one wear indicator pin is missing, the brake can stay in service if the remaining wear pin operation is satisfactory.
(c)
If either indicator pin is flush with surface of piston housing as shown in Fig. 601, brake must be replaced. It may be advisable, however, to remove brakes at 1/16-to 1/8-inch extension to avoid seal or brake damage when operator experience indicates this is necessary or the brake manufacturer advises this is desirable.
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May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-41-41 Page 601
Main Gear Brake Lining Wear Limits 591
32-41-41 Figure 601 Jun 20/84
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
E. Check Main Gear Brake with Wheel Removed
(1)
The brake unit must be removed, inspected and cleaned in accordance with the brake supplier component maintenance manual if it is suspected that a brake has been exposed to significant levels of contamination. Signs of contamination include a wet oily appearance, a buildup of charred residue, or heavy smoke after landing.
(2)
Check brake unit for cracks, breaks, bends, or other damage that may cause malfunction or leakage.
(3)
Visually check for loose, binding, or excessively worn parts.
(4)
Check brake pressure plate for tendency to bind, stick, or fail to return to off position for a minimum of 5 full cycles of brake application and release.
(5)
Check for effective braking action and a minimum running clearance.
(a)
Apply brakes and check for effective braking action.
(b)
Release brake and check for proper running clearance by measuring the clearance between the linings on the pressure plate and the No. 1 rotor assembly. Make the measurement at four equally spaced intervals around the brake periphery. Consult the appropriate vendor manual for proper running clearance.
(c)
Perform steps (a) and (b) for each brake.
NOTE: If brake rotors become misaligned when brake pressure is off, it will be necessary to realign them before installing wheels.
(6)
Check for deterioration of brake surface finishes and evidence of corrosion, especially on the brake carrier. If corrosion is excessive, the affected brake assembly should be replaced.
NOTE: Maintain surface finish in good condition as corrosion can occur rapidly under certain climatic conditions.
(7)
Set parking brake.
(8)
Determine if there is any further need for electrical power on airplane; if not, remove electrical power.
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May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-41-41 Page 603
HYDRAULIC BRAKE ACCUMULATOR - REMOVAL/INSTALLATION
1. General
A. This procedure covers removal and installation of system A and system B brake accumulators. System A brake accumulator is located on the aft wall of left wheel well and system B brake accumulator is located on the aft wall of right wheel well. The procedure is written around the system A accumulator, which is typical. Differences are noted.
2. Equipment and Materials
A. Ground Lock Assembly (Ref 32-00-01)
B. Hydraulic Fluid, Fire Resistant - BMS 3-11
3. Remove Hydraulic Brake Accumulator
A Ensure the landing gear is down and locked and ground lock assemblies installed
(Ref 32-00-01).
B. Depressurized hydraulic system A (Ref 29-11-0, Hydraulic System A - Maintenance Practices) and depressurize system A accumulator by applying brakes fully six times.
NOTE: For removal of system B brake accumulator, depressurize hydraulic system B (refer to 29-12-0, Hydraulic System B - Maintenance Practices) and depressurize system B accumulator by applying brakes fully six times.
C. Remove dust cap from brake accumulator charging valve.
D. Discharge nitrogen pressure from accumulator by loosening swivel hexagonal nut on charging valve a maximum of one turn.
WARNING: DO NOT LOOSEN VALVE BODY OR VALVE MAY BLOW OFF, RESULTING IN INJURY TO PERSONNEL.
E. Disconnect hydraulic line from upper end of accumulator. Cap line and hydraulic accumulator port (Fig. 401).
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