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THRUST REVERSER SYSTEM -BULLNOSE SEALS
Training Point Information
The bullnose seal can be repaired in short segments instead of complete replacement. The repair replaces the damaged segment of the seal and the fabric/adhesive splices are made between the repair segment and the other ends of the seal. Clean seal surfaces for the adhesive are required to get the high strength bonds to hold the fabric splice to the bullnose seal. All unwanted materials such as oils, greases, waxes or dirt must be removed. The bullnose seal repair procedure cannot be used to repair the bulb-type fire seals found on the thrust reverser. The bulb-type fire seals must be replaced if damaged.
The loss of more than 65 percent of the bullnose seal may allow separation of the translating sleeve outer wall from the auxiliary slider track. In service, a maximum of 10 percent of the seal can be missing or damaged on each thrust reverser half. If repair or replacement cannot be done immediately, Boeing recommends inspection of the seal every 10 days to make sure the seal damage is not more than the maximum limit.
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THRUST REVERSER BULLNOSE SEALS -BOLTED RETAINER
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THRUST REVERSER BULLNOSE SEALS -FLANGED RETAINER
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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Page 49 D633W101-BEJ Jan 05/2004
THRUST REVERSER SYSTEM -PRESSURE RELIEF DOORS
Purpose
The pressure relief doors open to release the under cowl air pressure from a duct burst.
Location
The pressure relief doors are installed in the aft cowl. There are two doors in each aft cowl for a total of four doors per engine.
Physical Description
Each door is an aluminum structure that is hinged at the forward end. Each door has two replaceable pressure relief latches. All adjustment of the door is done during the installation.
The same pressure relief door is used on the left and right aft cowl, but the hinge bolt and bushing details are different at each door hinge because of the door orientation in the aft cowl. On the left aft cowl, the short bolt and short bushing are installed at the upper hinge fitting and the long bolt and long bushing are installed at the lower hinge fitting. On the right aft cowl, the short bolt and short bushing are installed at the lower hinge fitting and the long bolt and long bushing are installed at the upper hinge fitting.
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