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gsphelp  Aerospace Standard 681

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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

 


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