a)  Make sure each brake operates to compress the heat stack.

 (f)  
Release the brake pedals.

 1)  Monitor the indicator on each brake assembly. a) Make sure that each brake releases.
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A
747-400 MAINTENANCE MANUAL
 S 865-062
 (2)
Remove the pressure from hydraulic system No. 4 (AMM 29-11-00/201).

 S 865-083

 (3)  
Pressurize hydraulic system No. 1 (AMM 29-11-00/201).

 S 715-033

 (4)  
Do the steps that follow to do a test for brake operation with the alternate system:

 (a)  
Make sure the pressure indication for hydraulic system No. 1 shows 2900-3150 psig.

 (b)  
Push the captain's brake pedals to the stops and hold them.

 1)  With the brake pedals held at the stops, look to make sure there are no leaks at each brake assembly and along the brake lines. No leaks are permitted.
 2)  Monitor the indicator on each brake assembly. a) Make sure that each brake operates to compress the heat stack.
 (c)  Release the brake pedals.
 1)  With the brakes released, look to make sure there are no leaks at each brake assembly and along the brake lines. No leaks are permitted.
 2)  Monitor the indicator on each brake assembly. a) Make sure that each brake releases.
 (d)  
Push the first officer's brake pedals forward to the stops and hold them. 1) Monitor the indicator on each brake assembly.

 a)  Make sure that each brake operates to compress the heat stack.

 (e)  
Release the brake pedals.

 1)  Monitor the indicator on each brake assembly. a) Make sure that each brake releases.
 G.  Put the Airplane Back to Its Usual Condition
 S 865-120
 (1)  
Set the parking brake.

 (2)
Remove the pressure from hydraulic system No. 1 (AMM 29-11-00/201).

 S 865-121
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-166
 (3)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 32-41-00-715-172
 4. Gear Retract Brake System - Operational Test
____________________________________________
 A. General
 (1)  
There must not be unusual noise in the hydraulic lines or in the brake valves during the operational test.

 B.
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 12-15-09/301, Brake Hydraulic Accumulator

 (3)  
AMM 12-15-11/301, Hydraulic Pressure Surge Accumulator

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 29-11-00/201, Main Hydrualic Supply System

 (6)  
AMM 32-00-30/201, Landing Gear Ground Locks

 C.
Access

 (1)  
Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH
 735 Wing Landing Gear - Left
 745 Wing Landing Gear - Right
 755 Body Landing Gear - Left
 765 Body Landing Gear - Right

 D.
Preconditions

 S 865-180
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power is available (AMM 24-22-00/201).

 (b)  
The brake hydraulic accumulator precharge pressure is correct (AMM 12-15-09/301).

 (c)  
The surge accumulators precharge pressure is correct (AMM 12-15-11/301).

 (d)  
The hydraulic systems are serviceable (AMM 29-11-00/201).

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