of the frangible or shear type

Industry

CPC
F05D2260/311

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Parent Industries

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F05Engines, pumps F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS F05D2260/00Function

Current Industry

F05D2260/311of the frangible or shear type

Industries

Patents Grantslast 30 patents

Information Patent Grant
Lubricant pump system and method for aircraft engine
- Patent number 12,140,036
- Issue date Nov 12, 2024
- Pratt & Whitney Canada Corp.
- Hervé Turcotte
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Laterally biased system for mounting auxiliary components to gas tu...
- Patent number 12,060,835
- Issue date Aug 13, 2024
- RTX Corporation
- Octavio Martin
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Fusible gearbox center guide support with frangible catcher pin sys...
- Patent number 12,006,875
- Issue date Jun 11, 2024
- RTX Corporation
- Ryan K Snyder
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Turbomachine module equipped with an electric machine rotor
- Patent number 11,952,904
- Issue date Apr 9, 2024
- SAFRAN AIRCRAFT ENGINES
- Romain Truco
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Torque limiting device in a connection between a gearbox and a stat...
- Patent number 11,879,383
- Issue date Jan 23, 2024
- Rolls-Royce Deutschland Ltd & Co KG
- Tomasz Grubba
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Lubricant pump system and method for aircraft engine
- Patent number 11,788,427
- Issue date Oct 17, 2023
- Pratt & Whitney Canada Corp.
- Hervé Turcotte
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Gas turbine engine with gearbox health features
- Patent number 11,674,413
- Issue date Jun 13, 2023
- Raytheon Technologies Corporation
- Frederick M. Schwarz
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Systems and methods for selectively disconnecting embedded electric...
- Patent number 11,639,669
- Issue date May 2, 2023
- General Electric Company
- Bartlomiej Drozd
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Method for manufacturing a motoring system for a gas turbine engine
- Patent number 11,536,199
- Issue date Dec 27, 2022
- Hamilton Sundstrand Corporation
- Matthew Allen Slayter
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Gas turbine engine bearing housing
- Patent number 11,408,304
- Issue date Aug 9, 2022
- Pratt & Whitney Canada Corp.
- Guy Lefebvre
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Turbomachine comprising a means of uncoupling a fan
- Patent number 11,391,290
- Issue date Jul 19, 2022
- SAFRAN AIRCRAFT ENGINES
- Alexandre Tan-Kim
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Geared gas turbine engine with gear driving low pressure compressor...
- Patent number 11,384,657
- Issue date Jul 12, 2022
- Raytheon Technologies Corporation
- William G. Sheridan
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Turbomachine comprising a means for decoupling a fan
- Patent number 11,371,384
- Issue date Jun 28, 2022
- SAFRAN AIRCRAFT ENGINES
- Michel Gilbert Roland Brault
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Air turbine starter with decoupler
- Patent number 11,352,956
- Issue date Jun 7, 2022
- GE Aviation Systems LLC
- Eliel Fresco Rodriguez
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Air turbine starter with decoupler
- Patent number 11,333,078
- Issue date May 17, 2022
- GE Aviation Systems LLC
- Subrata Nayak
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Mechanical shear fuse for engine motoring system
- Patent number 11,313,418
- Issue date Apr 26, 2022
- Hamilton Sundstrand Corporation
- Matthew Allen Slayter
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Frangible strut for gas turbine engine
- Patent number 11,313,250
- Issue date Apr 26, 2022
- Honeywell International Inc.
- Manjunath Subbarayachar
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Gas turbine engine with minimal tolerance between the fan and the f...
- Patent number 11,313,325
- Issue date Apr 26, 2022
- SAFRAN AIRCRAFT ENGINES
- Jeremy Dievart
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Fan for an aircraft cooling unit
- Patent number 11,280,347
- Issue date Mar 22, 2022
- SAFRAN ELECTRICAL & POWER
- Fabien Del Rio
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Dual stage catalytic thruster
- Patent number 11,236,703
- Issue date Feb 1, 2022
- Aerojet Rocketdyne, Inc.
- Matthew Dawson
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Containment assembly
- Patent number 11,156,125
- Issue date Oct 26, 2021
- Rolls-Royce PLC
- Martin Clowes
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Crushable spacer and bolted joint for a gas turbine engine
- Patent number 11,066,958
- Issue date Jul 20, 2021
- General Electric Company
- Apostolos Pavlos Karafillis
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbomachine
- Patent number 11,041,407
- Issue date Jun 22, 2021
- MAN Energy Solutions SE
- Steffen Braun
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Gas turbine engine component with performance feature
- Patent number 11,028,710
- Issue date Jun 8, 2021
- SIEMENS ENERGY, INC.
- David G. Maire
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Output assembly for an accessory gearbox of a gas turbine engine
- Patent number 11,002,318
- Issue date May 11, 2021
- GE AVIO S.R.L.
- Paolo Altamura
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Vaned ring for turbomachine stator having vanes connected to an out...
- Patent number 10,907,489
- Issue date Feb 2, 2021
- SAFRAN AIRCRAFT ENGINES
- Thierry Georges Paul Papin
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Fan rotatably connected to a drive shaft by means of a meltable ele...
- Patent number 10,883,512
- Issue date Jan 5, 2021
- SAFRAN ELECTRONICS & POWER
- Fabien Del Rio
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Portable jig and fixture for precision machining
- Patent number 10,843,277
- Issue date Nov 24, 2020
- General Electric Company
- Robert Edward Huth
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Frangible gas turbine engine airfoil with chord reduction
- Patent number 10,837,286
- Issue date Nov 17, 2020
- General Electric Company
- Nitesh Jain
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Frangible strut for gas turbine engine
- Patent number 10,837,320
- Issue date Nov 17, 2020
- Honeywell International Inc.
- Manjunath Subbarayachar
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

Patents Applicationslast 30 patents

Information Patent Application
PROPELLER FOR A TURBINE ENGINE OF AN AIRCRAFT WITH A VARIABLE-PITCH...
- Publication number 20240317385
- Publication date Sep 26, 2024
- SAFRAN AIRCRAFT ENGINES
- Ceddric BELJAMBE
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EFFECTOR INLET COVER, AND METHOD OF SEPARATION
- Publication number 20240068774
- Publication date Feb 29, 2024
- Raytheon Company
- Paul A. Merems
- F42 - AMMUNITION BLASTING
Information Patent Application
LUBRICANT PUMP SYSTEM AND METHOD FOR AIRCRAFT ENGINE
- Publication number 20230417153
- Publication date Dec 28, 2023
- PRATT & WHITNEY CANADA CORP.
- Hervé TURCOTTE
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
LATERALLY BIASED SYSTEM FOR MOUNTING AUXILIARY COMPONENTS TO GAS TU...
- Publication number 20230054275
- Publication date Feb 23, 2023
- Raytheon Technologies Corporation
- Octavio Martin
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEMS AND METHODS FOR SELECTIVELY DISCONNECTING EMBEDDED ELECTRIC...
- Publication number 20220251964
- Publication date Aug 11, 2022
- GENERAL ELECTRIC COMPANY
- Bartlomiej Drozd
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GEARED TURBOFAN WITH LOW PRESSURE TURBINE FEATURES
- Publication number 20210087944
- Publication date Mar 25, 2021
- Raytheon Technologies Corporation
- William G. Sheridan
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
FAN FOR AN AIRCRAFT COOLING UNIT
- Publication number 20200355196
- Publication date Nov 12, 2020
- SAFRAN ELECTRICAL & POWER
- Fabien DEL RIO
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
FRANGIBLE STRUT FOR GAS TURBINE ENGINE
- Publication number 20200347751
- Publication date Nov 5, 2020
- HONEYWELL INTERNATIONAL INC.
- Manjunath Subbarayachar
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CRUSHABLE SPACER AND BOLTED JOINT FOR A GAS TURBINE ENGINE
- Publication number 20200200045
- Publication date Jun 25, 2020
- Apostolos Pavlos Karafillis
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBINE ENGINE CASE ATTACHMENT AND A METHOD OF USING THE SAME
- Publication number 20200182153
- Publication date Jun 11, 2020
- United Technologies Corporation
- James T. Roach
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINE COMPRISING A MEANS OF UNCOUPLING A FAN
- Publication number 20200149542
- Publication date May 14, 2020
- SAFRAN AIRCRAFT ENGINES
- Alexandre Tan-Kim
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Frangible Gas Turbine Engine Airfoil
- Publication number 20200141268
- Publication date May 7, 2020
- GENERAL ELECTRIC COMPANY
- Nicholas Joseph Kray
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
MECHANICAL SHEAR FUSE FOR ENGINE MOTORING SYSTEM
- Publication number 20200141452
- Publication date May 7, 2020
- HAMILTON SUNDSTRAND CORPORATION
- Matthew Allen Slayter
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
AIR TURBINE STARTER WITH DECOUPLER
- Publication number 20200123983
- Publication date Apr 23, 2020
- GE AVIATION SYSTEMS LLC
- Eliel Fresco Rodriguez
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Frangible Gas Turbine Engine Airfoil with Chord Reduction
- Publication number 20200116027
- Publication date Apr 16, 2020
- GENERAL ELECTRIC COMPANY
- Nitesh Jain
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
FRANGIBLE STRUT FOR GAS TURBINE ENGINE
- Publication number 20200095895
- Publication date Mar 26, 2020
- HONEYWELL INTERNATIONAL INC.
- Manjunath Subbarayachar
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
VANED RING FOR TURBOMACHINE STATOR HAVING VANES CONNECTED TO AN OUT...
- Publication number 20200024997
- Publication date Jan 23, 2020
- SAFRAN AIRCRAFT ENGINES
- Thierry Georges Paul Papin
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINE COMPRISING A MEANS FOR DECOUPLING A FAN
- Publication number 20200018181
- Publication date Jan 16, 2020
- SAFRAN AIRCRAFT ENGINES
- Michel Gilbert Roland BRAULT
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
AIR TURBINE STARTER WITH DECOUPLER
- Publication number 20190331029
- Publication date Oct 31, 2019
- GE AVIATION SYSTEMS LLC
- Subrata Nayak
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Application
PINNED MECHANICAL FUSE FOR ENGINE MOTORING SYSTEM
- Publication number 20190323434
- Publication date Oct 24, 2019
- HAMILTON SUNDSTRAND CORPORATION
- Matthew Allen Slayter
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTAINMENT ASSEMBLY
- Publication number 20190301303
- Publication date Oct 3, 2019
- Rolls-Royce plc
- Martin CLOWES
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...
- Publication number 20190234414
- Publication date Aug 1, 2019
- Henry E. Howard
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...
- Publication number 20190234415
- Publication date Aug 1, 2019
- Henry E. Howard
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...
- Publication number 20190234413
- Publication date Aug 1, 2019
- Henry E. Howard
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
FRANGIBLE AIRFOIL FOR A GAS TURBINE ENGINE
- Publication number 20190136698
- Publication date May 9, 2019
- GENERAL ELECTRIC COMPANY
- David William Crall
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Turbomachine
- Publication number 20190093515
- Publication date Mar 28, 2019
- MAN Energy Solutions SE
- Steffen BRAUN
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Application
GAS TURBINE ENGINE COMPONENT WITH PERFORMANCE FEATURE
- Publication number 20190040756
- Publication date Feb 7, 2019
- SIEMENS ENERGY, INC.
- David G. Maire
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE WITH GEARBOX HEALTH FEATURES
- Publication number 20190017410
- Publication date Jan 17, 2019
- United Technologies Corporation
- Frederick M. Schwarz
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE FAN BLADE CONTAINMENT SYSTEMS
- Publication number 20180283204
- Publication date Oct 4, 2018
- The Boeing Company
- Carlos Angelo Fracchia
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Application
GAS TURBINE ENGINE FAN BLADE CONTAINMENT SYSTEMS
- Publication number 20180283205
- Publication date Oct 4, 2018
- The Boeing Company
- Carlos Angelo Fracchia
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...

of the frangible or shear type

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Lubricant pump system and method for aircraft engine

Laterally biased system for mounting auxiliary components to gas tu...

Fusible gearbox center guide support with frangible catcher pin sys...

Turbomachine module equipped with an electric machine rotor

Torque limiting device in a connection between a gearbox and a stat...

Lubricant pump system and method for aircraft engine

Gas turbine engine with gearbox health features

Systems and methods for selectively disconnecting embedded electric...

Method for manufacturing a motoring system for a gas turbine engine

Gas turbine engine bearing housing

Turbomachine comprising a means of uncoupling a fan

Geared gas turbine engine with gear driving low pressure compressor...

Turbomachine comprising a means for decoupling a fan

Air turbine starter with decoupler

Air turbine starter with decoupler

Mechanical shear fuse for engine motoring system

Frangible strut for gas turbine engine

Gas turbine engine with minimal tolerance between the fan and the f...

Fan for an aircraft cooling unit

Dual stage catalytic thruster

Containment assembly

Crushable spacer and bolted joint for a gas turbine engine

Turbomachine

Gas turbine engine component with performance feature

Output assembly for an accessory gearbox of a gas turbine engine

Vaned ring for turbomachine stator having vanes connected to an out...

Fan rotatably connected to a drive shaft by means of a meltable ele...

Portable jig and fixture for precision machining

Frangible gas turbine engine airfoil with chord reduction

Frangible strut for gas turbine engine

Patents Applicationslast 30 patents

PROPELLER FOR A TURBINE ENGINE OF AN AIRCRAFT WITH A VARIABLE-PITCH...

EFFECTOR INLET COVER, AND METHOD OF SEPARATION

LUBRICANT PUMP SYSTEM AND METHOD FOR AIRCRAFT ENGINE

LATERALLY BIASED SYSTEM FOR MOUNTING AUXILIARY COMPONENTS TO GAS TU...

SYSTEMS AND METHODS FOR SELECTIVELY DISCONNECTING EMBEDDED ELECTRIC...

GEARED TURBOFAN WITH LOW PRESSURE TURBINE FEATURES

FAN FOR AN AIRCRAFT COOLING UNIT

FRANGIBLE STRUT FOR GAS TURBINE ENGINE

CRUSHABLE SPACER AND BOLTED JOINT FOR A GAS TURBINE ENGINE

TURBINE ENGINE CASE ATTACHMENT AND A METHOD OF USING THE SAME

TURBOMACHINE COMPRISING A MEANS OF UNCOUPLING A FAN

Frangible Gas Turbine Engine Airfoil

MECHANICAL SHEAR FUSE FOR ENGINE MOTORING SYSTEM

AIR TURBINE STARTER WITH DECOUPLER

Frangible Gas Turbine Engine Airfoil with Chord Reduction

FRANGIBLE STRUT FOR GAS TURBINE ENGINE

VANED RING FOR TURBOMACHINE STATOR HAVING VANES CONNECTED TO AN OUT...

TURBOMACHINE COMPRISING A MEANS FOR DECOUPLING A FAN

AIR TURBINE STARTER WITH DECOUPLER

PINNED MECHANICAL FUSE FOR ENGINE MOTORING SYSTEM

CONTAINMENT ASSEMBLY

METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...

METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...

METHOD FOR COMPRESSING AN INCOMING FEED AIR STREAM IN A CRYOGENIC A...

FRANGIBLE AIRFOIL FOR A GAS TURBINE ENGINE

Turbomachine

GAS TURBINE ENGINE COMPONENT WITH PERFORMANCE FEATURE

GAS TURBINE ENGINE WITH GEARBOX HEALTH FEATURES

GAS TURBINE ENGINE FAN BLADE CONTAINMENT SYSTEMS

GAS TURBINE ENGINE FAN BLADE CONTAINMENT SYSTEMS