R Fan Cowl Door Opening Figure 005
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R Fan Cowl Door Hold Open Rods Figure 006
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4. Access Doors/Pressure Relief Door
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R (Ref. Fig. 001, 007, 008) A combination access/pressure relief door is provided in the right-hand fan cowl door for access to the starter valve manual override. This door also acts as a pressure relief door to protect the door structure in the event of a burst duct. The left-hand fan cowl door includes an access door for engine oil servicing and inspection of the hydraulic case drain filter clogging indicator and master oil chip detector indicator. The air outlet vent is located in the right-hand cowl panel lower aft section. The fan cowl doors are fireproof without external air flow above the 45-degree radial and fireproof with external air flow below the 45-degree radial. In addition, the doors are fire resistant without external air flow below the 45-degree radial.
5. Fan Cowl Structure
__________________ The internal pressure loads and external air loads are reacted through the honeycomb structure. They are transmitted into the pylon through the hinge fittings. The door lands provide support to prevent deflection under pressure. The cowl doors, when completely latched, provide hoop continuity. The cowl doors are designed to be structurally adequate when any one latch is unlatched or any one hinge failed. A nacelle overpressurization condition due to a pneumatic duct failure is released through the pressure relief door. The pressure relief doors are designed to prevent fan compartment pressure from exceeding 4 psid (0.28 bar).
6. Fan Cowl Materials
__________________ The fan cowl structural assembly is a bonded composite skin and a aluminium honeycomb sandwich structure with provisions for attaching hinge fittings, latch fittings, access doors, hold open rods, and air vents. See the following table for component materials.
Fan Cowl Component Materials
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COMPONENT MATERIAL ------------------------------------------------------------------------------Skins Graphite epoxy tape and fabric
Core 5052 or 5056 aluminium honeycomb
Hinges 17-4PH steel casting
Latch housing 17-4PH steel casting
Eye bolt housing 17-4PH steel casting
Hold open rod Graphite epoxy fabric tubes
aluminium end fittings
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R Fan Cowl Pressure Relief/Starter Access Door Figure 007
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R Oil Tank Access Door Figure 008
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7. Fan Cowl Removal/Installation
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R (Ref. Fig. 009) Each fan cowl assembly (left and right) is attached to the pylon by three hinge fittings.
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R Fan Cowl Door Installation Hardware Figure 009
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FAN COWL - MAINTENANCE PRACTICES
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TASK 71-13-00-010-040
Opening of the Fan Cowl Doors
WARNING : DO NOT OPEN THE FAN COWL DOORS WHEN THE ENGINE IS RUNNING.
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CAUTION : DO NOT OPEN THE FAN COWL DOORS IF THE WIND SPEED IS MORE THAN 65
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KNOTS.
CAUTION : WHEN THE FAN COWL DOORS ARE OPEN, DO NOT USE THE FIRE DETECTOR
_______ SUPPORT TUBE AND ELEMENTS FOR A HAND HOLD. THE TUBE AND ELEMENTS CAN BEND. THIS WILL CAUSE THEM TO RUB ON OTHER COMPONENTS AND CAUSE DAMAGE, OR TO MAKE INCORRECT FIRE WARNING INDICATION.
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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