AN 01-25CN-2             PARAGRAPH 6
c. PROPELLER.   (1) DESCRIPTION: A Curtiss electric constant speed eleven foot diameter (11') three (3) bladed propeller is installed on this airplane.

  (2) REMOVAL: To remove the propeller from the airplane.

  (a) Operate the propeller to maximum low pitch.

  (b) Remove the right-hand section of the engine cowl and work through the hand holes in the forward engine cowl bulkhead.

  
  NOTE:  
For airplanes stationed in desert areas, there is a filter box located on each side of the nose section under engine side cowling and directly in back of spinner bulkhead.

There is a shut-off in the- front of the downdraft cowling, 'this is operated from the cockpit, and the control is located at the right side of the cockpit.

When this shut-off is closed in the top cowling, the air is taken in through these two filter boxes.

These filter boxes must be removed in order to reach in through the hand holes in spinner bulkhead when removing nose cone.

With the engine cowling off, remove the filter boxes as follows: Remove the three filter box screws which hold filter box to spinner bulkhead. Loosen clamps on filter box connection hose. Lift out filter box complete with hose and clamps.

  (c) Disconnect the flexible conduit from the brush holder cap assembly.

  d) Remove the safety pin from the top and bottom brush holder latch assembly. 		        (e) Raise the brush holder latches and remove the brush holder cap carefully to avoid damage to the brushes.

  (f) Remove the three elastic stop nuts attaching the spinner nose cone to the aft section and remove the nose cone.

  (g) Remove the cap screws and the three nuts from the flange of the propeller power unit assembly. Remove the power unit assembly, the synthetic rubber seal, and the grease seal from the propeller shaft.

  (h) Remove the locking pin assembly and the locking sleeve, install the extension nut with pin, insert a bar completely through the two holes in the nut, and turn the nut off.

  (i) The propeller may now be removed from the propeller shaft. Exercise extreme care when removing the propeller to avoid damage to the propeller shaft threads. The propeller weighs approximately 375 pounds. Therefore, it is advisable to use at least three men to remove this assembly. Place the propeller in a suitable buck. NEVER allow the end of the blades to support the weight of the propeller.

(3) TO REMOVE THE AFT SECTION OF THE PROPELLER SPINNER FROM THE PROPELLER HUB.

  (a) Remove the ten flush head screws from the three cover assemblies on the outer surface of the spin. ner aft section and remove the covers. (See Fig. 78.)

  (b) Remove the outer circle of screws from the rear of the aft bulkhead. DO NOT DISTURB THE INNER CIRCLE OF BALANCE SCREWS.

  (c) Remove the aft section of the spinner from the propeller hub.

  (4) To REMOVE THE AFT BULKHEAD FROM THE PROPELLER HUB.-Remove the nine nuts and bolts from the inner flange of the propeller hub and lift the bulkhead from the hub.

  (5) TO ASSEMBLE THE AFT BULKHEAD TO THE PROPELLER HUB-Reverse the procedure noted above.