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Engine Pressure Regulator, "ON" position


Nc97
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I know the 1C-130H-2-21JG-10-1 states that the Engine Pressure Regulator must indicate between 38 and 52 PSI, or between 70 and 74 PSI for AC-130U airplanes, or between 56 and 70 PSI for MC-130E/H/W airplanes in the "ON" position, but what does the -1 Flight Manual mandate?

Looking for an agreement (or disagreement) between the maintenance manual and the flight manual.

Thanks.

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Regulators should indicate within approximately 3 psi of each other.

With all engine bleed-air switches to ON, bleed-air pressure should be approximately 50 psi.

The 3 PSI is the limitation as if they "are not" within 3 PSI you must place them in "OVERRIDE" or "OFF" depending on what book you have...

The problem I have with that is if you turn them "OFF" on the outboard motor you invalidate your VMC numbers which are based on "normal bleed"...

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No matter the number (+/- 3, 7, whatever) if you turn OFF the bleed air your VMC numbers are wrong as there will be MORE torque than the charted airspeed number accounts for....it will be TOO LOW... more yaw, same airflow over the rudder...

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No matter the number (+/- 3, 7, whatever) if you turn OFF the bleed air your VMC numbers are wrong as there will be MORE torque than the charted airspeed number accounts for....it will be TOO LOW... more yaw, same airflow over the rudder...

Mostly true, but if you had 19.6 with or without the bleeds off, VMCA will be the same. They recently took the VMCA increase reference out of the performance manual as well....not sure why though.

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Ok....19.6 is 19.6

Any (Take Off) with "Maximum" torque setting with the bleeds closed (less than 19.6) and your VMCA charted speed will be TOO LOW.....

Closing the Regulator will cause an approx 600 inlb increase in torque. VMCA speed is based on Maximum torque WITH normal bleed.... not plus 600 inlbs.

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