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Woodward |
Woodward Governor Company |
Time Between Overhaul Periods (TBO) - 33580J
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1. Planning Information |
A. Effectivity |
Owners and Operators of Aircraft Using Woodward Propeller Governors, Pumps, Auto Feather Valves, Speed Signal Generators, and Type I Synchronizers. |
B. Concurrent Requirements |
None. |
C. Reason |
To provide Recommended Time Between Overhaul Periods (TBO) for Woodward Propeller Governors, Pumps, Auto Feather Valves, Speed Signal Generators, and Type I Synchronizer Components. |
D. Description |
Wear rates of governor assemblies and accessories will vary with operating conditions. The listed TBOs are based on the following assumptions: |
1. Continuous operation with a minimum of 10 hours per month. |
2. Engine Maintenance performed as specified by the engine and airframe manufacturers. |
3. The unit has not been subjected to sudden stoppage, lightning strike, or oil contamination (Overhaul is required at any time the unit is subjected to sudden stoppage, lightning strike, or contaminated oil.). |
Exceptions to specified TBO: |
1. Aircraft engaged in crop dusting or other chemical application flying should reduce the unit TBO to match the percent of reduction in the recommended engine TBO. |
2. The recommended calendar time limit is 6 years for units not in continuous service with a minimum of 120 hours per year. For units in continuous service with a minimum of 120 hours per year, the unit can be operated to the recommended TBO in hours provided the following inspections and conditions are met. |
A. All Airworthiness Directives, Service Bulletins and Service Letters have been complied with. |
B. Unit has no visible physical damage which would include cracks, corrosion, etc. |
C. Unit has no visible physical damage which would include cracks, corrosion, etc. |
D. There has been no malfunction in the operation of the unit. |
E. There has been no 6 month period when the unit was not operated for a minimum of 10 hours. |
3. Governors and accessories listed below might exceed the Woodward recommended Time Between Overhaul (TBO) if they are maintained in accordance with an "On Condition" or "Condition Monitored" system approved by the U.S. Federal Aviation Administration or the Canadian Department of Transportation. These federally approved maintenance monitoring methods become an alternate to the manufacturer's recommended Time Between Overhaul. When such governors are returned for servicing on an Investigate and Repair As Necessary (IRAN) basis the customer must specify the Time Since New (TSN) or Time Since Overhaul (TSO). Cooperating with the above approved maintenance methods causes Woodward to "return to service" IRAN governors with accrued hours in excess of Woodward's recommended Time Between Overhaul. |
E. Compliance |
Not applicable. |
F. Approval |
Technical aspects of this service bulletin are FAA approved. |
G. Manpower |
No additional man hours required if accomplished during routine assembly / disassembly. |
H. Weight and Balance |
Not affected. |
I. Electrical Load Data |
Not affected. |
J. Software Accomplishment Summary |
Not applicable. |
K. References |
None. |
L. Other Publications Affected |
None. |
M. Interchangeability or Intermixability of Parts |
Not applicable. |
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2. MATERIAL INFORMATION |
A. Material - Price and Availability |
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B. Industry Support Information |
None. |
C. Material Necessary for Each Aircraft / Engine / Component |
See Material - Price and Availability |
D. Material Necessary for Each Spare |
Not applicable. |
E. Reidentified Parts |
Not applicable. |
F. Tooling - Price and Availability |
Not applicable. |
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3. RECOMMENDATIONS |
(1) Recommended Time Between Overhaul (TBO) for Woodward Propeller Governors, Pumps, Auto Feather Valves, Speed Signal Generators, and Type I Synchronizer Components are the same as recommended TBO of engine on which unit is installed except for units in the applicable Time Between Overhaul Table. |
Reciprocating Engine Governor Time Between Overhaul Table
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Governor 210582 |
TBO 500 Hours |
Turboprop Primary Governor Time Between Overhaul Table
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Governor A210765 |
TBO 2000 Hours |
Governor 210561 |
TBO 3500 Hours |
Governor 210742 |
TBO 3500 Hours |
Governor 8210-109 |
TBO 3500 Hours |
Turboprop Reversing Type Primary Governor Time Between Overhaul Table
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Governor 210544 |
TBO 3500 Hours |
Governor 210574 |
TBO 4000 Hours |
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Except those manufactured or factory remanufactured prior to February 1973 - TBO 2200 Hours |
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Turboprop Propeller Governor with Pneumatic Overspeed Limiter
(Airbleed Governor) Time Between Overhaul Table
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Governor 8210-002 |
TBO 4500 Hours |
Governor 8210-034 |
TBO 4500 Hours |
Governor 8210-135 |
TBO 4500 Hours 2500 Hours 2500 Hours |
Governor 8210-392 |
TBO 2500 Hours 2500 Hours 2500 Hours |
Turboprop Overspeed Governor Time Between Overhaul Table
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Governor 210507 |
TBO 6500 Hours |
Governor 210624 |
TBO 6500 Hours |
Governor 210950 |
TBO 6500 Hours 6500 Hours |
Governor 8210-091 |
TBO 7500 Hours |
Auto Feather Valve Time Between Overhaul Period Table
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Auto Feather Valve 8905-002 |
TBO 4500 Hours |
Pump Time Between Overhaul Table
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Pump 8210-076 |
TBO 3000 Hours |
Pump 8210-178 |
TBO 3000 Hours |