DOC AIRBUS | AMM A320FTURBINE REAR FRAME MODULE - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The Turbine Rear Frame (TRF) is located at the end of the Low Pressure Turbine (LPT) rotor and stator module (Ref. AMM D/O 72-58-00-00). The TRF engine mounts are attached by clevis mounts to the pylon rear attachment.
The TRF is installed as follows:
On the front face flanges:
On the rear face:
** ON A/C NOT FOR ALL The Turbine Rear Frame (TRF) is located at the end of the Low Pressure Turbine (LPT) rotor and stator module (Ref. AMM D/O 72-58-00-00). The TRF engine mounts are attached by clevis mounts to the pylon rear attachment.
The TRF is installed as follows:
On the front face flanges:
- At the top, the outer casing is attached to LPT case with 88 nuts and bolts.
- At the bottom, the hub is attached to the No. 5 bearing support with 45 nuts and bolts.
On the rear face:
- The outer casing flange supports the exhaust nozzle.
- The hub flange supports the exhaust plug.
2. System Description
The primary parts of the TRF module are:
There are three clevis mounts at the top of the TRF to attach the engine to the airframe, one in the middle is the fail-safe mount and do not support the engine in normal conditions.
** ON A/C NOT FOR ALL The primary parts of the TRF module are:
Turbine rear Frame Module- TRF
- No. 5 bearing lubrication system
- No. 5 bearing support
- Air exhaust system.
There are three clevis mounts at the top of the TRF to attach the engine to the airframe, one in the middle is the fail-safe mount and do not support the engine in normal conditions.
3. Component Description
A. TRF
The functions of the TRF are:
The functions of the TRF are:
- To support the engine and cowlings
- To provide the support to the LPT rotor rear section
- To direct and ensure a smooth aerodynamic airflow.
B. No. 5 Bearing Lubrication System
(1) The TRF struts permit the passage for the oil tubes:
(a) Oil supply tube
The oil supply tube is located at 5 o'clock position. The function of the oil supply tube is to supply the oil to the No. 5 bearing oil nozzle to lubricate the No. 5 bearing.
The oil supply tube is located at 5 o'clock position. The function of the oil supply tube is to supply the oil to the No. 5 bearing oil nozzle to lubricate the No. 5 bearing.
(b) Oil return tube
The oil return tube is located at 6 o'clock position. The function of the oil return tube is to ensure the delivery of oil from the No. 5 bearing sump to the scavenge line. The tube is welded to the TRF.
The oil return tube is located at 6 o'clock position. The function of the oil return tube is to ensure the delivery of oil from the No. 5 bearing sump to the scavenge line. The tube is welded to the TRF.
(c) Oil supply tube (squeeze film)
The oil supply tube (squeeze film) is located at 5 o'clock position. The function of oil supply damper tube is to lubricate the No. 5 bearing squeeze film.
The oil supply tube (squeeze film) is located at 5 o'clock position. The function of oil supply damper tube is to lubricate the No. 5 bearing squeeze film.
(d) Oil drain tube
The oil drain tube is located at 6 o'clock position. The function of the oil return tube is to ensure the delivery of oil from the sump flooding back to the outside of the module.
The oil drain tube is located at 6 o'clock position. The function of the oil return tube is to ensure the delivery of oil from the sump flooding back to the outside of the module.
(e) Exhaust air tube
Refer to the air-exhaust system (paragraph 3.E).
Refer to the air-exhaust system (paragraph 3.E).
C. No. 5 Bearing Support
The function of the No. 5 bearing support is to provide radial support of the LPT shaft module (Ref. AMM D/O 72-57-00-00) and LPT rotor and stator assembly (Ref. AMM D/O 72-58-00-00). It is made of nickel alloy.
The oil scavenge outer case, the oil scavenge inner case (abradable) and the rear enclosure seal ring teeth ensure the oil containment for the rear sump. Both cases are attached on the front face of the No. 5 bearing support. The rear face of the No. 5 bearing support provides the support to the No. 5 bearing inner race and to the air exhaust system.
The function of the No. 5 bearing support is to provide radial support of the LPT shaft module (Ref. AMM D/O 72-57-00-00) and LPT rotor and stator assembly (Ref. AMM D/O 72-58-00-00). It is made of nickel alloy.
The oil scavenge outer case, the oil scavenge inner case (abradable) and the rear enclosure seal ring teeth ensure the oil containment for the rear sump. Both cases are attached on the front face of the No. 5 bearing support. The rear face of the No. 5 bearing support provides the support to the No. 5 bearing inner race and to the air exhaust system.
D. Recovering Plate
The recovering plate ensures the flow path sealing between the LPT stage 7 blade and the TRF.
The recovering plate ensures the flow path sealing between the LPT stage 7 blade and the TRF.
E. Air-Exhaust System
The function of air exhaust system is to ventilate the front sump during engine deceleration to reduce oil consumption. It is attached to the injection nozzle with the 8 bolts and nuts. The air exhaust system consists of:
The exhaust tube supports the central ventilation tube.
The exhaust tube support (abradable) ensures the oil containment of the rear sump with the rear ventilation tube teeth.
The function of air exhaust system is to ventilate the front sump during engine deceleration to reduce oil consumption. It is attached to the injection nozzle with the 8 bolts and nuts. The air exhaust system consists of:
- Central ventilation tube
- Exhaust tube
- Exhaust air tube
- Injection nozzle
- Exhaust tube support
- Central ventilation tube support attached to the exhaust plug supports the end of the central ventilation tube.
The exhaust tube supports the central ventilation tube.
The exhaust tube support (abradable) ensures the oil containment of the rear sump with the rear ventilation tube teeth.
F. Borescope Hole
There is a borescope hole at 4 o'clock to permit the inspection of the LPT stage 6 and stage 7.
There is a borescope hole at 4 o'clock to permit the inspection of the LPT stage 6 and stage 7.
G. Drain Hole
There is a drain hole at 6:30 o'clock to avoid accumulation of fuel in case of aborted engine start.
There is a drain hole at 6:30 o'clock to avoid accumulation of fuel in case of aborted engine start.
H. Connections
There are six rectangular holes (three on each side) to connect air tubes coming from the Transient Bleed Valve (TBV) to permit the discharge of the HPC pressure into the primary flowpath.
There are six rectangular holes (three on each side) to connect air tubes coming from the Transient Bleed Valve (TBV) to permit the discharge of the HPC pressure into the primary flowpath.