(10) After 2 hours of gel time, apply a maximum of 120 deg.F (49 deg.C) heat to the sealants for a minimum of 2 hours.
5. Close-up
________ Subtask 71-13-15-410-050
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the warning notice(s).
(4) Remove the access platform(s).
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MOUNTS - DESCRIPTION AND OPERATION
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1. General
_______ (Ref. Fig. 001) The engine/pylon connection is achieved by means of a two-mount system :
- The forward mount is a damage-tolerant design consisting of a two-piece beam, single piece cross beam, and two links which attach to the pylon and aft fan case. Attached to the beam are two links which are attached to the engine attach brackets. These brackets attach to the engine fan case.
- The aft mount is a damage-tolerant design consisting of a two-piece cross beam, that attaches to the pylon. From this beam, there are three, three-piece links which attach to the engine rear frame .
2. System Description
__________________ (Ref. Fig. 002) The engine mounts are designed for side, vertical, thrust and torque loads. The damage-tolerant assemblies consist of links and beams with swaged-in spherical bearings on the ends. The link and beam assemblies are bolted to the engine at the engine fan case and turbine rear frame mount, and interface with the pylon. Additional locking and retaining features are provided on the bolts, or pins, at structural attachment points. The engine mount design provides dual load paths to ensure safe operation should one member fail.
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Mounts
Figure 001
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Engine Mount Loads
Figure 002
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FORWARD MOUNT - DESCRIPTION AND OPERATION
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1. Description___________ (Ref. Fig. 001) The forward mount connects the engine aft fan case with the engine pylon forward structure. The forward mount is a damage tolerant design. It consists of :
- the support beam assembly : for pylon connection via 4 tension bolts and 2 alignment pins. This fail-safe designed fitting is an assembly of 3 components : 2 half-fittings and 1 plate.
- one bearing fitted on the support beam assembly which carries y and z loads. The outer cage is axially free in the engine aft fan frame aperture and therefore carries no x loads. In case of lateral link failure, the bearing partially carries the x loads.
- one link/beam/bracket assembly which carries the x thrust loads. The beam is hinged to the main bracket at its center. A link is installed at each end of the beam. A bracket attached to the engine casing supports the front of the link. The link ends have bearings.
2. Material________ The forward engine mount beam is machined from an Inconel 718 forging. The crossbeam, links and engine attach brackets are machined from 6-4 Titanium.
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Forward Engine Mount
Figure 001
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MOUNT - FORWARD - REMOVAL/INSTALLATION
______________________________________ TASK 71-21-11-000-041 Removal of the Forward Engine Mount
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-00-00-000-042 Removal of the Power Plant 71-21-11-991-300 Fig. 401
3. Job Set-up
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