20-10-09
ALL ú ú 01 Page 804 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
~.............................................................................. | Table IA | | Approved Tube Materials | ................................................................................ | | Tube Size | 04 | 06 | 08 | 10 | 12 | 16 | ................................................................................ |Tube |21-6-9 CRES | 0.016 | 0.020 | 0.026 | 0.033 | 0.039 | 0.052 | |Material |(BMS 7-185) | | | | | | | | ...................................................................... | |3AL-2.5V | 0.016 | 0.019 | 0.026 | 0.032 | 0.039 | 0.051 | | |Titanium | | | | | | | | |(AMS 4945) | | | | | | | | ...................................................................... | |304 1/8 | 0.020 | 0.028 | 0.035 | 0.049 | 0.058 | 0.065 | | |Hard CRES | | | | | | | | |(MIL-T-6845) | | | | | | | | ......................................................................
| |6061-T6 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 |
| |Aluminum | | | | | | |
| |AMS 4083 | | | | | | |
| |(MIL-T-7081) | | | | | | |
| |Return/Supply/| | | | | | |
| |Suction Only | | | | | | |
2.........…..............…........…........…........…........…........…........1
NOTE: CONSULT BOEING BEFORE USING ALTERNATE TUBE MATERIAL/WALL THICKNESS
____ COMBINATIONS FOR 3000 PSI HYDRAULIC SYSTEM APPLICATIONS
TASK 20-10-09-308-225
2. Tube Repair
___________
A. General
(1) Use Hydraulic System Desgin Pressure/IN PSI/ as shown in Table 2 during repairs.
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20-10-09
ALL ú ú 01 Page 805 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
~............................................................................... | TABLE 2 | | HYDRAULIC SYSTEM DESIGN PRESSURES | ................................................................................. | COMPONENT | Maximum Working | Proof | Burst | | | Pressure | Pressure | Pressure | | | psi | psi | psi | ................................................................................. |Pressure lines (including | | | | |hoses and fittings) and | | | | |units with air under full | | | | |system pressure (such as | | | | |accumulators). | 3000 | 6000 | 12000 | ................................................................................. |Return and case drain lines,| 600 | 900 | 1500 | |fittings and units | | | | ................................................................................. |Return line hoses | 600 | 1500 | 3000 | ................................................................................. |Pump Supply reservoirs, | 65 | 100 | 200 | |units, lines and fittings | | | | ................................................................................. |Airbleed Line (Upstream of | | | | |regulator) | 250 | 500 | 1000 | ................................................................................. |Drains and vents open to | | | | |atmosphere | 15 | 50 | 75 | 2............................…...................…...............…..............1
(2) When you remove, install, or do work with hydraulic tube assemblies, obey the guidelines that follow:
(a)
When you remove tubes, you must make sure the tubes and port fitings have tags that identify the correct connection location.
(b)
Do not move or change the tube bends. If you move or change the bend in the tube, these bad effects can occur: 1) If you move or change a bend in the tube, it can become
possible that the tube will align with the incorrect port. If this occurs, incorrect reconnection or cross-correction of the tubes can become possible.
2) If you move or change the bend in the tube, it can be possible that the tube will have too much stress when it is connected. Stress can cause cracks in the tubes.
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