ATA 54 Nacelles Maintenance Training Manual PDF 2023

BOMBARDIER DHC 8-400 (PWC PW150) ATA 54 - NACELLES TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES It includes the structure of the lower fairing and the forward and aft upper fair...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 54 - NACELLES TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES It includes the structure of the lower fairing and the forward and aft upper fairings. GENERAL DESCRIPTION Each engine is housed in a nacelle installed below the wing. The nacelle houses these components: The nacelle makes an aerodynamic surface around the power plant. The power plant, exhaust assembly, wing structure, and main landing gear are also contained in the nacelle. • • • Main landing gear Engine exhaust Landing gear accessories The forward nacelle extends forward from the wing front spar frame and contains the main support structure for the propulsion system. The nacelle centre section extends from the nacelle forward section to the lower aft section. The nacelle aft section extends aft from the aft spar. Each nacelle has these three parts: • • • Forward Nacelle Centre Nacelle Aft Nacelle The forward nacelle encloses the engine mounting structure. The mounting structure supports the: • • • • • Propeller Gearbox Engine Systems Cowlings Engine operating and aerodynamic loads are transferred through the structure to the nacelle centre section and wing box. The nacelle centre section houses the main landing gear and wing nacelle attachments points. The nacelle aft section houses part of the exhaust assembly, and the main landing gear wheels when retracted. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 2 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - NACELLE DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 3 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES FORWARD NACELLE The forward nacelle is a housing for the power plant. It includes the structure of the engine mount system, fairings and access doors, and lower cowl. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 4 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - FORWARD NACELLE LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 5 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES FORWARD NACELLE SUPPORT FRAMES AND STRUTS Engine torque is transferred to the forward frame by the Hydraulic Torque Compensation System. The forward frame is designed to redistribute loads if a mount or strut fails. The struts distribute the load from the forward frame through the mid frame to the centre section and wing box using fittings and bolted joints. The mid frame also supports the rear of the engine through two aft elastomeric vibration isolator mounts. The forward frame has these interfaces: • • • • • • • • • • • Engine vibration isolators Hydraulic torque compensation system Three strut attachment brackets Ground support engine hoist bracket Lower cowling attachment Eight engine bonding leads Upper forward cowling location pin Spine attachment Electrical loom attachments Side door stay attachment Engine and accessories clearance • • • • • • • • • • • • Airframe de-ice attachment Fuel feed and motive flow line terminations Hydraulic feed, return and case drain line terminations Fire extinguisher line terminations Harness clipping Strut fittings Lower cowl connection Leading edge fairing connection Spine connection Forward door interface and door stay latch Aft door attachment DC fault current ground lead The engine mounting structure has a forward frame (Horse Collar). This frame supports the engine through three elastomeric vibration isolator mounts to transfer the loads from the propeller and engine into the struts through strut fittings. The frame is a machined titanium section with an integral Warren Girder web stiffening section. It is installed perpendicular to the engine axis and is located outside the engine rotor burst zone. The space frame strut configuration for the engine mounting structure gives: • • • • • Structural redundancy Rotor burst and damage tolerance Lateral stiffness Weight Access for maintenance The rear engine mounts are attached to the mid frame. The mid frame distributes the loading from the engine and propeller. It is a machined titanium frame and has these interfaces: • • Engine aft vibration isolators Pneumatic pre-cooler and two valves TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 6 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - NACELLE SUPPORT FRAMES AND STRUTS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 7 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES FORWARD NACELLE SUPPORT FRAMES AND STRUTS CONTINUED The struts are made from machined and forged stainless steel with fork attachments at both ends. The strut fittings are machined titanium and are bolted to the forward and mid frame positions. The fittings are located at three locations on the aft face of the forward frame, and at the forward and aft face of the mid frame. The fittings are bolted to the frames. The strut bolt connections to the fittings are bushed. The leading edge fairing is made from carbon epoxy composite with foam stiffening. Copper mesh on the outer surface gives HIRF and lightning strike protection. The fairing has an access panel for access to the upper area of the zone and leading edge bay for maintenance. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 8 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - FORWARD NACELLE DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 9 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES FORWARD NACELLE LOWER COWL The lower cowl is the only primary structural cowl. It serves as a partial load path for propulsion and inertial loads during normal operating conditions. In the event of primary structural element failure, the lower cowl is designed to transfer loads to the wing box. The lower cowl is mounted with six expander bolts. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 10 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - LOWER COWL LOCATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 11 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES AFT NACELLE ACCESS PANELS AFT EXHAUST TRUNNIONS ACCESS PANELS An access panel is installed on each side of the nacelle aft section at the mid upper position. The access panels are machined from solid aluminium alloy. The access panels are bolted to the aft mid upper cowl and the nacelle aft structure. REFUEL/DEFUEL PANEL ACCESS DOOR (RIGHT NACELLE) The access door is located at the bottom of the right aft nacelle. It is machined from solid aluminium alloy. The access door opens out on a hinge at its forward edge, and latches in the closed position at two points on its rear edge. There are ten countersunk holes in the aft lower cowl for attachment by bolts to the access door hinge. HYDRAULIC SERVICE ACCESS PANEL The hydraulic service access panel gives access to the hydraulic system service points. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 12 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - RIGHT NACELLE PANELS DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 13 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES AFT NACELLE ACCESS PANELS CONTINUED FLAPS ACCESS PANEL This access panel is installed on the inboard side of the nacelle aft section at the forward upper position. The access panel is machined from solid aluminium alloy. The access panel has 24 countersunk holes and is screwed to the aft mid upper cowl and the nacelle aft structure. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 14 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - NACELLE FLAPS ACCESS PANEL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 15 of 18 BOMBARDIER DHC 8-400 (PWC PW150) NACELLES AFT NACELLE TOP PART OF THE NACELLE AFT SECTION The top fairing is located above the aft exhaust assembly and has two parts: • • The aft mid upper cowl forward part is a U shaped fairing made from carbon fibre/nomex honeycomb. It is attached at its forward end to an alloy frame at the rear of the nacelle centre section The aft upper cowl aft part has two skins made from fabricated aluminium alloy. This makes the opening at the rear for the aft exhaust outlet. The aft upper cowl gives a clearance around the aft exhaust outlet, which lets a secondary airflow decrease the exhaust temperature in the nacelle BOTTOM PART OF THE AFT NACELLE The bottom part of the nacelle aft section has a large panel aft lower cowl on each side with a bulkhead that connects them at the mid point. They are made from carbon fibre/nomex honeycomb. Expanded copper foil is put in the outer surface of the aft lower cowl. The front end of the aft lower cowl makes the shape of a fairing for the retracted MLG wheel unit. The rear end of the aft lower cowl right nacelle only makes the shape of a fairing for a refuel/defuel adapter and control panel. The aft lower cowl is closed at the rear end by the boat-tail fairing. The top of the aft lower cowl is closed by a heat shield. The heat shield is made from fabricated aluminium alloy, part of which is in the shape of the MLG wheels when in the retracted position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 16 of 18 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - NACELLES - AFT NACELLE ACCESS PANELS DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 17 of 18 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 54 - NACELLES Issue 6 - January 2023 Page 18 of 18