Aerospace Standard 681
Aerospace Standard 681
|
<< Click to Display Table of Contents >>
|
  
|
The power setting of the engine is usually defined by a Power Lever Angle (PLA). Other forms of power setting control can be either Power Code (PC) or Rating Code (RC). Since the PLA setting is sometimes unknown, the power setting can be best described unambiguously by defining standard settings to specific values.
The SAE (Society of Automotive Engineers) has developed a standard (Aerospace Standard 681) for the designation of gas turbine engine power settings.
When the PLA power setting values are unknown, the power setting can be replaced by either a Power Code or a Rating code, where the latter is a more specific setting for the power setting as is may have settings related to the flight/ambient conditions.
An example for the Power Code power setting is the following:
|
Power Code |
Definition |
Augmented |
100.0 |
Maximum |
|
to |
to |
|
60.0 |
Minimum |
|
|
|
Nonaugmented |
50.0 |
Maximum |
|
to |
to |
|
20.0 |
Minimum |
|
|
|
Reverse |
15.0 |
Maximum |
|
to |
to |
|
5.0 |
Minimum |
An example for the Rating Code power setting is the following:
|
Power Code |
Definition Military |
Definition Commercial |
Augmented |
100.0 |
Maximum |
Emergency |
|
90.0 |
Maximum Continuous |
Maximum |
|
60.0 |
Minimum Augmented |
Minimum |
|
55.0 |
- |
Wet Takeoff |
|
|
|
|
Nonaugmented |
55.0 |
Maximum |
- |
|
50.0 |
Intermediate |
Dry takeoff |
|
45.0 |
Maximum Continuous |
Maximum Continuous |
|
40.0 |
- |
Maximum Climb |
|
35.0 |
- |
Maximum Cruise |
|
21.0 |
Idle (Flight) |
Flight Idle |
|
20.0 |
Idle (Ground) |
Ground Idle |
|
|
|
|
Reverse |
15.0 |
Idle |
Idle |
|
5.0 |
Maximum Reverse |
Maximum |