757
MAINTENANCE MANUAL
(b) Make sure that the brake shown in Table 2, column A, releases for 5 |3 seconds and then applies again.
NOTE: You can see the brakes apply and release if you watch
____
the brake wear pins move.
(c) Make sure that the ANTISKID light on the P5 panel is on and the ANTISKID message appears on the EICAS advisory page.
~............................................................
| TABLE 2 |
..............................................................
| Step | BRAKE TEST Rotary Switch Position | A | B |
..............................................................
| 1 | BRAKE TEST 1 | 1 | 1-2 |
| 2 | BRAKE TEST 5 | 5 | 5-6 |
| 3 | BRAKE TEST 2 | 2 | |
| 4 | BRAKE TEST 6 | 6 | |
| 5 | BRAKE TEST 3 | 3 | 3-4 |
| 6 | BRAKE TEST 7 | 7 | 7-8 |
| 7 | BRAKE TEST 4 | 4 | |
| 8 | BRAKE TEST 8 | 8 | |
| | | | |
2......…...................................….......….........1
D. Do a Test of Brake Application with the Alternate Antiskid System
S 865-024
(1)
Pressurize the left hydraulic system and reservoir (AMM 29-11-00).
S 865-025
(2)
Depressurize the right hydraulic system and reservoir
(AMM 29-11-00).
S 745-026
(3)
Do steps 1, 2, 5 and 6 of Table again. Make sure that the brake pairs shown in column B apply and release.
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757 MAINTENANCE MANUAL
S 865-023
(4)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P6 panel:
(a)
6F4, LANDING GEAR PARKING BRAKE VLV
S 945-027
(5) Do the steps in the Put the Airplane Back to Its Usual Condition if it is not necessary to do more maintenance.
TASK 32-42-00-705-028
5. Antiskid Transducer Spin-Up Test (Fig. 502)________________________________
A. General
(1)
This is a test to make sure that the brakes apply and release while you manually turn the antiskid transducer.
(2)
You can see the brakes apply and release if you look at the movement of the brake pistons or the brake wear indicator pins.
B.
Equipment
(1)
Antiskid Transducer Spin-Up Equipment -A32075-10
C.
Prepare for the Test
S 945-240
WARNING:_______THIS TEST APPLIES AND RELEASES THE BRAKES. MAKE SURE THAT THE AREA AROUND THE BRAKES IS CLEAR AND THAT CHOCKS ARE INSTALLED ON THE AIRPLANE WHEELS. THIS WILL PREVENT POSSIBLE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Prepare for the Tests.
S 495-030
(2)
Make sure that the landing gear downlocks are installed (AMM 32-00-20).
(3)
Make sure that chocks are installed on the wheels.
S 865-032
(4)
Release the parking brake.
D.
Do the Anti-Skid Transducers Spin-Up Test
(1)
Pressurize the right hydraulic system and reservoir (AMM 29-11-00).
S 865-034
(2)
Open this circuit breaker on the P6 panel and attach a DO-NOT-CLOSE tag:
(a)
6F4, LANDING GEAR PARKING BRAKE VLV
S 495-031
S 865-033
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(3) S 865-035Set the parking brake.
(4) S 035-036Remove the hubcaps from all the main gear wheels.
(5) S 215-037Examine the transducer drive components on the hubcap for damage. Replace any parts that are damaged.
(6) S 715-038Turn the transducer for wheel 1 at 600-1000 RPM and make sure that the tandem brake (wheel 5) releases.
(7) S 715-039Stop the movement of the transducer as quickly as it is possible. Make sure that the brake on wheel 5 applies again.
(8) S 715-040Turn the transducer on wheel 1 again and then stop its movement quickly. Make sure that the brake on wheel 1 releases and then applies again.
(9) S 715-041Do the four steps above again for the wheels shown in Table 3.
~...................... | Table 3 | ........................ | Wheel | Tandem Wheel | ........................ | 2 | 6 | | 5 | 1 | | 6 | 2 | | 3 | 7 | | 4 | 8 | | 7 | 3 | | 8 | 4 | 2.......…..............1
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