(10)
For the applicable airplane maximum taxi weight and tire, find the minimum nose tire service pressure (Fig. 301).
S 613-019
(11)
Make sure both of the nose gear tires are above the minimum cold specified pressures for the the airplane's maximum weight.
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ú ú ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 311Sep 28/02
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757
MAINTENANCE MANUAL
S 613-021
CAUTION: DO NOT DEFLATE A HOT TIRE TO LOWER THE PRESSURE TO THE AVERAGE
_______ PRESSURE VALUE. PRESSURE SHOULD NEVER BE BLED FROM A HOT TIRE TO ACHIEVE A SPECIFIED VALUE. DAMAGE TO EQUIPMENT CAN OCCUR.
(12) If the pressure of one tire is 5%-10% below the average of the other tire, do these steps:
WARNING:_______USE A REGULATED PRESSURE SOURCE TO SERVICE THE TIRES. AN UNREGULATED PRESSURE SOURCE CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(a)
Connect the inflator, F70199-1 to the inflation valve and inflate the tire with nitrogen, BB-N-411, Type I or MIL-PRF-27401, Type I to the value of the other tire.
(b)
Remove the inflator, F70199-1 from the inflation valve.
S 613-025
(13) If the tire pressure of one tire is more than 10% below the pressure of the other tire, do these steps:
(a) Replace the tire and wheel assembly (32-45-02/401).
1) Send the wheel and tire assembly for an inspection to find the cause for the low tire pressure.
S 613-027
(14) If the tire pressure of one tire is more than 20% below the pressure of the other tire, do these steps:
(a)
Replace the tire and wheel assembly.
1) Send the wheel and tire assembly for an inspection to find the cause for the low tire pressure.
(b)
Replace the wheel and tire assembly installed on the opposite side of the axle. 1) Mark on the tire that it was on the same axle with a wheel
and tire assembly that was replaced because of low tire pressure. 2) Send the tire for inspection for damage.
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12-15-03
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ú ú ú 02.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 312Sep 28/02
A
757 MAINTENANCE MANUAL
PARKING BRAKE ACCUMULATOR - SERVICING
_____________________________________
1. General_______
A. The parking brake accumulator is filled with dry nitrogen to a pressure shown on the Fig. 301 placard. The charging valve for the accumulator and the pressure gauge are found in the aft fairing hydraulic equipment compartment.
TASK 12-15-04-613-001
2. Fill the Parking Brake Accumulator (Fig. 301)__________________________________
A. Equipment
(1) Pressurized Nitrogen Source (2000 psi)
B. References
(1)
AMM 06-41-00/201, Fuselage Access Doors and Panels
(2)
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems
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