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RESTRICTED T.O. No. 02-35GC-1 (2) The following procedure will always govern when changing the condition of power of turbo-super-charged engines. (a) Increasing Engine Power. 1. Adjust mixture control to obtain the fuel/air ratio specified for the power desired. 2. Adjust propeller control to obtain the desired rpm. 3. Adjust throttle control to obtain the desired manifold pressure. 4. Advance turbo-supercharger regulator if necessary. 5. Readjust mixture control if necessary. (b) Decreasing Engine Power. 1. Retard turbo-supercharger regulator. 2. Adjust throttle control to obtain the desired manifold pressure. 3. Adjust the propeller control to obtain the desired rpm. 4. Readjust throttle if necessary. 5. Adjust the mixture control to obtain the desired fuel/air ratio. d. R-1820-71 and -87 Engines. (1) The following procedure will always govern when changing the condition of power for these engines. (a) Increasing Engine Power. 1. Adjust mixture control to obtain the fuel/air ratio specified for the power condition desired. 2. Adjust propeller control to obtain the desired rpm. 3. Adjust throttle control to obtain the desired manifold pressure. 4. Readjust mixture control, if necessary. (b) Decreasing Engine Power. 1. Adjust throttle control to obtain the desired manifold pressure. 2. Adjust propeller control to obtain the desired rpm. 3. Readjust throttle controls, if necessary. 4. Adjust mixture controls to obtain the desired fuel/air ratio. (2) Additional Instructions for R-1820-87 Engine. (a) These engines should be operated in low supercharger ratio at altitudes up to the lower super-charger critical altitude for the power being used. (b) Changes from one supercharger ratio to another should be made quickly. The supercharger control must be locked at the end of its travel in either ratio in insure complete engagement of the clutch. (c) When shifting from low to high supercharger ratio, proceed in the following manner: 1. Set mixture control in "Auto-Rich" position. 2. Partially close the throttle so that the desired high supercharger manifold pressure will not be exceeded. 3. Move the supercharger control rapidly from "Low" position to "High" position and lock. 4. Readjust the throttle setting if the manifold pressure is not at the desired value for high supercharger operation. 5. Readjust the rpm setting only as necessary to obtain desired power. 6. Readjust the mixture to obtain the desired setting. (d) When shifting from high to low supercharger ratio, proceed in the following manner: 1. Set the mixture control in "Auto-Rich" position. 2. Quickly move the supercharger control to the extreme "Low" supercharger position and lock before moving throttle. 3. Set the desired manifold pressure with the throttle. 4. Readjust the rpm setting only as necessary to obtain desired power. 5. Readjust the mixture control to obtain the desired setting. (e) During flight, wait at least five minutes after changing supercharger ratios before making another supercharger ratio change in order to provide opportunities for dissipation of the heat generated during clutch engagement. RESTRICTED -6-