background
x
loader
System Description
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

This page includes :

     

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

01/05/16

Overview

The bypass section has an inner fan duct and two outer fan ducts. These ducts control the secondary flow from the fan through the nacelle to provide thrust. The bypass section supports the engine control systems, components and engine build unit (EBU). The bypass section also helps to decrease engine noise and prevents migration of an engine fire from the nacelle area to the pylon and fuselage.

The bypass section has a forward outer, aft outer and inner fan duct assembly. The cool air moves through the aft section to mix with the primary flow near the mixer nozzle. There are two fairing assemblies between the inner and the outer fan ducts for wire routing and other systems that go from the engine core to the engine nacelle.

300_7270_001

01/05/16

High Bypass Duct

The high bypass duct points the airflow from the fan through the nacelle to supply thrust. It also supports and accesses the engine control systems, components, and the engine build unit (EBU). The high bypass duct helps decrease engine noise. It can also contain an engine fire for the engine fire zones. The high bypass duct system has the following components:

Forward Outer Fan Duct

The forward outer fan duct is a single-piece case. It controls and supplies a path for the engine airflow through the bypass duct. Its forward interface is attached to the engine front frame, and its rear interface is attached to the rear outer fan duct. The forward outer fan duct has two panels to give access for the engine maintenance and borescope inspection.

Forward Outer Fan Duct Panels

There are two forward outer fan duct panels. They give access for maintenance of the compressor variable geometry (CVG) actuator and the start bleed valves. They also give access for the borescope inspection of the compressor. The two panels are installed at the lower left and lower right side of the forward outer fan duct. These panels are made of aluminum and applied with Alodyne for corrosion protection.

300_7270_002

300_7270_004

Rear Outer Fan Duct

The rear outer fan duct is a one-piece case. It controls and supplies a path for the engine airflow through the bypass duct. Its forward interface is attached to the forward outer fan duct. Its aft interface is the attachment point for the thrust reverser. The rear outer fan duct has four panels to access for engine maintenance and borescope inspection.

Rear Outer Fan Duct Panels

There are four panels on the rear outer fan duct that help decrease the noise from the engine. They also give access for engine maintenance and borescope inspection. The four panels are installed on the internal surface of the rear outer fan duct.

The four panels are made from graphite epoxy and applied with Alodyne for corrosion protection.

300_7270_005

300_7270_006

Center Inner Fan Duct Panels

Six panels make up the center inner fan duct These panels are high-temperature aluminum alloy. Each panel overlaps the other. The internal surface of each panel has two stiffeners to increase the strength of the panel. The top and bottom panels interface with the service fairings to allow pass-through of the external plumbing.

The forward interface of each panel is attached to the forward inner fan duct panel. The aft interface of each panel attaches to brackets installed on the engine core.

Rear Inner Fan Duct Panels

Four panels make up the rear inner fan duct. These panels are high-temperature aluminum alloy. These panels give access to the exhaust gas temperature (EGT) sensors. These panels can be removed through the rear outer fan duct panels for engine maintenance and inspection.

Forward Inner Fan Duct Panels

Eight panels make up the forward inner fan duct. These panels are made from graphite composite material. Each panel has a scoop to let in bypass air below the inner fan ducts. The bypass air decreases the temperature in fire zone 2 and the engine core cases.

The forward interface of these panels is attached to the engine front frame. The rear interface of these panels is attached to the brackets on the combustor flange of the engine core. These panels can be removed through the rear outer fan duct panels to give access for engine maintenance and inspection.

Service Fairing

There are four service fairings installed on the center inner fan duct panels, two at the top panel and two at the bottom panel. The service fairings allow pass-through of the engine wiring harness, bleed duct, external plumbing, and engine drains. The service fairings also allow pass-through of the engine and aircraft systems routing from the engine core into fire zone 1.

Fan Inlet Spinner

The fan inlet spinner is attached to the fan disk with eight bolts and has features for the field fan trim balance. It gives the front axial hold for the fan blades. The fan inlet spinner is a two-piece aluminum that has a cone shape. The fan inlet spinner does not use the anti-ice system for anti-ice protection. It can shed ice off its surface in cold conditions.

300_7270_003

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.