National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants...
-
Upload
sharleen-wade -
Category
Documents
-
view
219 -
download
0
Transcript of National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants...
![Page 1: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/1.jpg)
National Transportation Safety BoardNational Transportation Safety Board
Powerplants and Maintenance IssuesPowerplants and Maintenance Issues
Dave Keenan
Powerplants Group Chairman
Dave Keenan
Powerplants Group Chairman
![Page 2: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/2.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Powerplants and Maintenance IssuesPowerplants and Maintenance Issues
• Right Propeller
• Right Engine
• Time Between Overhauls
• Approved Airworthiness Inspection Program
• Engine Maintenance Issues
• Conclusions
• Right Propeller
• Right Engine
• Time Between Overhauls
• Approved Airworthiness Inspection Program
• Engine Maintenance Issues
• Conclusions
![Page 3: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/3.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right PropellerRight Propeller
Manufacturer – McCauley Propeller Systems
Piqua, Ohio
Model – 3AF32C505-C
Characteristics:• Three Bladed• Dual Acting• Constant Speed• Full Feathering
Manufacturer – McCauley Propeller Systems
Piqua, Ohio
Model – 3AF32C505-C
Characteristics:• Three Bladed• Dual Acting• Constant Speed• Full Feathering
![Page 4: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/4.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right Propeller FindingsRight Propeller Findings
• External• All propeller blades and counterweights were
in place and intact.• Blade angles measured 82.2°, 82.4°, and
82.3°.• Feather angle is 82.2° (± 0.3°).
• Internal• All internal components were intact and
undamaged.
• External• All propeller blades and counterweights were
in place and intact.• Blade angles measured 82.2°, 82.4°, and
82.3°.• Feather angle is 82.2° (± 0.3°).
• Internal• All internal components were intact and
undamaged.
![Page 5: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/5.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right Propeller ConclusionsRight Propeller Conclusions
The propeller was fully feathered when the airplane contacted the water.
• Measured blade angles
• Lack of damage to blades and internal operating mechanisms
The propeller was fully feathered when the airplane contacted the water.
• Measured blade angles
• Lack of damage to blades and internal operating mechanisms
![Page 6: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/6.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right EngineRight Engine
Manufacturer – Teledyne Continental Motors Mobile, Alabama
Model – TSIO-520-VBCharacteristics
• Turbocharged, fuel-injected, air-cooled, reciprocating engines
• Rated for 325 horsepower, at a power setting of 2,700 RPM with 39 inches of mercury manifold pressure up to an
altitude of 12,000 feet.
Manufacturer – Teledyne Continental Motors Mobile, Alabama
Model – TSIO-520-VBCharacteristics
• Turbocharged, fuel-injected, air-cooled, reciprocating engines
• Rated for 325 horsepower, at a power setting of 2,700 RPM with 39 inches of mercury manifold pressure up to an
altitude of 12,000 feet.
![Page 7: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/7.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right Engine FindingsRight Engine Findings
• The No. 2 cylinder was separated from the engine, and its piston was fragmented.
• The No. 2 cylinder was generally intact.• Cylinder hold-down studs (10)
– Three studs were intact with their threads undamaged.
– Six studs were fractured in high stress fatigue.– Two loose hold-down nuts were recovered
from the engine compartment.
• The No. 2 cylinder was separated from the engine, and its piston was fragmented.
• The No. 2 cylinder was generally intact.• Cylinder hold-down studs (10)
– Three studs were intact with their threads undamaged.
– Six studs were fractured in high stress fatigue.– Two loose hold-down nuts were recovered
from the engine compartment.
![Page 8: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/8.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Engine Maintenance IssuesEngine Maintenance Issues• The right engine had accumulated 2,270.6 hours
time since overhaul (TSO) at the time of the accident.
• TCM Service Information Letter SIL 98-9A recommends a 1,600 hour TBO interval.
• Air Sunshine was operating to a TBO of 2,400 hours in accordance with FAA Aviation Safety Inspector Handbook 8300.10.
• A requirement for Air Sunshine to obtain these TBO increases was that they develop their own Approved Aircraft Inspection Program (AAIP).
• The right engine had accumulated 2,270.6 hours time since overhaul (TSO) at the time of the accident.
• TCM Service Information Letter SIL 98-9A recommends a 1,600 hour TBO interval.
• Air Sunshine was operating to a TBO of 2,400 hours in accordance with FAA Aviation Safety Inspector Handbook 8300.10.
• A requirement for Air Sunshine to obtain these TBO increases was that they develop their own Approved Aircraft Inspection Program (AAIP).
![Page 9: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/9.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Engine Maintenance IssuesEngine Maintenance Issues
• Differential compression tests– Theory– The last differential compression test of the No.
2 engine was performed during a Phase 1 inspection on June 12-14, 2003.
– The results indicated that there were two cylinders with abnormally low readings and a third, the No. 2 cylinder, that held no pressure at all.
• Differential compression tests– Theory– The last differential compression test of the No.
2 engine was performed during a Phase 1 inspection on June 12-14, 2003.
– The results indicated that there were two cylinders with abnormally low readings and a third, the No. 2 cylinder, that held no pressure at all.
![Page 10: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/10.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Engine Maintenance IssuesEngine Maintenance Issues
• Engines last overhauled in December 1999.• No logbook entries for any cylinder changes
since the time of the last overhaul.• The No. 6 cylinder had been removed and
replaced between the last engine overhaul and the accident flight.
• The results of the last differential compression test (6/03) would have been enough justification to have removed, inspected, and replaced the No. 2 cylinder while troubleshooting the low reading.
• Engines last overhauled in December 1999.• No logbook entries for any cylinder changes
since the time of the last overhaul.• The No. 6 cylinder had been removed and
replaced between the last engine overhaul and the accident flight.
• The results of the last differential compression test (6/03) would have been enough justification to have removed, inspected, and replaced the No. 2 cylinder while troubleshooting the low reading.
![Page 11: National Transportation Safety Board Powerplants and Maintenance Issues Dave Keenan Powerplants Group Chairman Dave Keenan Powerplants Group Chairman.](https://reader035.fdocuments.net/reader035/viewer/2022081806/5697bf981a28abf838c912e0/html5/thumbnails/11.jpg)
National Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, BahamasNational Transportation Safety Board
Air Sunshine Flight 527, Cessna 402C, N314AB, Treasure Cay, Bahamas
Right Engine ConclusionRight Engine Conclusion
The simultaneous loosening of two or more of the right engine No. 2 cylinder hold-down nuts resulted from the application of insufficient torque, which was most likely applied by Air Sunshine maintenance personnel during undocumented maintenance.
The simultaneous loosening of two or more of the right engine No. 2 cylinder hold-down nuts resulted from the application of insufficient torque, which was most likely applied by Air Sunshine maintenance personnel during undocumented maintenance.