NOTE: This procedure can be applied to all accessory gearbox
____ pads receiving hydraulic equipment.
(3) For this procedure, the accessory gearox will be refered to as the AGB.
B. Equipment
(1) Sealing tool - B56A2675, CFM International, P.O. Box 15514, Cincinnati, OH 45215
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C. Consumable Materials
(1)
Filtered air or nitrogen source - 10-12 psig (0.7-0.8 kpa), 40 microns absolute filtration, oil less than 40 mg for each kilogram of air, water content at -40 deg F (-40 deg C) dew point at atmospheric pressure, ambient temperature
(2)
D00601, Grease (CP2101) graphite - GP40, Aeroshell 8
(3)
D00599, Oil (CP2442) Engine - CFMI SB 79-001
D. References
(1)
AMM 71-11-02/201, Fan Cowl Panels
(2)
AMM 72-60-00/201, Accessory Drives
E. Access
(1)
Location Zones
502/602 Left Fan Cowl Panels
503/603 Right Fan Cowl Panels
506 Engine No. 1 - Turbine Frame
606 Engine No. 2 - Turbine Frame
(2)
Access Panels
5737L Engine No. 1 - Right Fan Cowl Panel
5746L Engine No. 1 - Left Fan Cowl Panel
5837R Engine No. 2 - Right Fan Cowl Panel
5846R Engine No. 2 - Left Fan Cowl Panel
F. Examine the AGB for leakage (Fig. 501).
S 015-043-C00
(1)
Open the left and right fan cowl panels (AMM 71-11-02/201).
S 025-044-C00
(2)
Disconnect the starter or fuel pump, and hydraulic and CSD pad drain.
S 945-045-C00
(3)
Remove the storage plugs from tool 856A2675-P04/07.
S 425-046-C00
(4)
Take sealing tool 856A2675 and connect the flexible hose 856A2675-P04 to the AGB drain nipple. Tighten the connector to 200-250 pound-inches (22.6-28.2 Newton meters).
S 425-047-C00
(5)
Connect flexible hose 856A2675-P07 to the air or nitrogen supply and tighten to 200-250 pound-inches (22.6-28.2 Newton meters).
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S 205-057-C00
CAUTION: DO NOT OVER-PRESSURIZE THE CAVITY. THE MAXIMUM PERMITTED_______
PRESSURE IS 29 PSI (200 kpa). OVER-PRESSURIZING THE
SYSTEM CAN DAMAGE THE MAG SEAL.
(6) Open the air or nitrogen supply source and pressurize the cavity to
14.5 PSI (1 kpa).
S 425-049-C00
(7) Close the isolation valve to isolate the AGB cavity.
S 785-050-C00
(8) Do a check of the sealing cavity to make sure there is no decrease
in air pressure for one minute.
S 795-051-C00
(9) If you cannot isolate and pressurize the cavity, or if you find a
quick pressure decrease, this indicates one or more of the these
conditions:
NOTE: The problems listed directly below all involve the____
starter or other equipment attached to the AGB. You will
need to remove these items to troubleshoot, isolate, and
correct the defect.
(a) The AGB has a damaged O-ring.
(b) There is a missing O-ring on the starter output shaft.
(c) There is a problem with a carbon seal.
S 785-052-C00
(10)
After you corrected the problem, perform the pressurized leak check again to make sure the AGB cavity has a satisfactory seal.
S 415-053-C00
(11)
After you complete the pressurized test of the AGB, remove the sealing tool and re-install the oil tube on the starter or other drain pad. Torque the connector to 200-250 pound-inches (22.6-28.2 Newton meters).
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