Propeller Assembly. 1. General

Propeller Assembly GENERAL 61-10: PROPELLER ASSEMBLY 1. General The propeller assembly consists of a hollow aluminum hub which supports the propeller blades and also houses the pitch changing mechanism. Movement of propeller blades is controlled by a hydraulic piston/cylinder combination mounted on the front of the hub. Serials w/ Hartzell Propeller: The linear motion of the hydraulic piston is transmitted to each blade through a pitch change rod and fork. A pitch change knob at the base of each blade intersects with the fork. Serials w/ McCauley propeller: The linear motion of the hydraulic piston is transmitted to each blade through a piston rod, linkage assembly, and actuating pin. The actuating pin assembly is secured to the base of each blade with screws. Blade pitch is controlled by the governor. The governor supplies oil to the propeller hub to move the blades toward high pitch position (decreased RPM). Conversely, the propeller blades move toward low pitch position (increase RPM) as the governor drains oil away from the propeller hub. A mechanical spring is installed within the propeller to assist movement of the blades to a lower pitch position as RPM decays since blade centrifugal twisting moment is only present when the propeller is rotating. The mechanical spring will ensure that blade angle will reach the low pitch stop when the propeller is static. If oil pressure is lost at any time, the propeller will move to low pitch. The propeller assembly employs high-strength, aluminum or composite blades. An aluminum or composite spinner assembly enhances the appearance of the propeller and streamlines air flow over the propeller to improve performance. The spinner dome attaches to a spinner bulkhead at the rear of the propeller hub. It is essential that the propeller assembly be maintained in accordance with vendor recommended service procedures. Refer to the manufacturer s approved Instructions For Continued Airworthiness. 1

. Maintenance Practices A. Propeller - Serials w/ Hartzell Propeller (See Figure 61-10-1) Ensure master and magneto switches are off, and ignition key is removed. (1) Removal - Propeller (a) Acquire necessary tools, equipment, and supplies. (b) Remove key from ignition. (c) Set BAT 1, BAT, and AVIONICS switches to OFF positions. (d) Move fuel selector to OFF position. (e) Place mixture control in idle cut-off. (f) Remove engine cowling. (Refer to 1-10) (g) (h) (i) (j) (k) (l) Description P/N or Spec. Supplier Purpose Hoist - Any Source Hoist propeller. Sling - Any Source Secure propeller to hoist. Drain Pan - Any Source Receive waste lubricant. To ensure spinner dome is reinstalled in same clocked position, draw a reference line across spinner dome and spinner bulkhead. Remove screws and washers securing spinner dome to spinner bulkhead. Remove spinner dome from airplane. Position hoist and lifting sling forward of airplane and attach sling to propeller. Place a drain pan beneath propeller to catch any spilled lubricant. Serials w/ Ice Protection: Remove bolt, washer, clamp, and nut securing slinger ring feed tube to bracket on engine baffle and remove feed tube nozzle from inside of slinger ring. Loosen and remove nuts and washers securing propeller to engine flange.

(m) (n) (o) (p) (q) Note orientation of propeller blades to engine to ensure propeller is reinstalled in correct clock position. Remove propeller from engine flange with care to prevent damaging the propeller mounting studs. Remove propeller from airplane. Serials w/ Ice Protection: Remove bolts, p-clips, washers, and nuts securing feed tubes to propeller hub. To ensure spinner bulkhead is reinstalled in same clocked position, draw a reference line across spinner bulkhead and propeller hub. Remove bolts, spacers, washers, and nuts securing spinner bulkhead to propeller hub. Remove O-ring from groove inside hub at flange mounting and discard. Remove drain pan and discard spilled lubricant. () Installation - Propeller (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Hoist - Any Source Hoist propeller. Sling - Any Source Secure propeller to hoist. Degreaser - Any Source Degrease components. O-Ring C-331-8 Hartzell Propellers Inc. Sealing component for Hartzell propeller. (b) Apply a light coat of engine oil to new O-ring and bore surfaces of propeller. Insert O-ring into groove inside hub at flange mounting. Verify spinner bulkhead is in same clocked position as originally installed. 3

(c) (d) (e) (f) (g) (h) (i) (j) (k) Serials w/ Standard Weight Hub: Position spinner bulkhead to propeller hub and secure with bolts, spacers, washers, and nuts. Torque nuts 0 to ft-lb (.1 to 9.8 Nm). (Refer to 0-60) Serials w/ Light Weight Hub: Position spinner bulkhead to propeller hub and secure with bolts, spacers, washers, and nuts. Torque nuts 4 to 6 ft-lb (3.5 to 35. Nm). (Refer to 0-60) Serials w/ Ice Protection: Install bolts, p-clips, washers, and nuts securing blade feed tubes to propeller hub. Clean the engine shaft, propeller flange, and engine flange. Verify propeller is in same clocked position as originally installed. Care must be taken to avoid damaging hub or O-ring when installing propeller. Do not attempt to forcefully draw propeller onto engine flange with nuts. Using hoist and sling, align dowel pins in propeller flange with corresponding holes in engine mounting flange. Tighten nuts evenly to avoid hub damage. Install washers and nuts securing propeller to engine flange. Torque nuts 0 to 80 ft-lb (94.9 to 108.5 Nm). (Refer to 0-60) Serials w/ Ice Protection: Position slinger ring feed tube to engine baffling bracket and to inside of slinger ring. Install bolt, washer, clamp, and nut securing feed tube to engine baffling. Verify spinner dome is in same clocked position as originally installed. Position spinner dome to front of propeller hub and secure to spinner bulkhead with screws and washers. Serials w/ Ice Protection: Check feed tube alignment. 1 Perform Inspection/Check - Blade Feed Tube Orientation. (Refer to 30-60) Perform Inspection/Check - Slinger Ring Feed Tube Orientation. (Refer to 30-60) (l) Install engine cowling. (Refer to 1-10) 4

Figure 61-10-1: Propeller Installation - Serials w/ Hartzell Propeller ENGINE PROP FLANGE (REF) 11 6 3 5 14 16 10 9 4 15 3 8 5 1 13 1 10 11 10 1 NOTE Serials w/ Regular Weight Hub: Torque nuts to 0 - ft-lb (.1-9.8 Nm). Serials w/ Light Weight Hub: Torque nuts to 4-6 ft-lb (3.5-35. Nm). Torque nuts to 50-0 in-lb (5.6 -.9 Nm). Torque nuts to 0-80 ft-lb (94.9-108.5 Nm). 10 9 8 18 6 Serials w/ composite spinner. LEGEND 1. Spinner. Washer 3. Screw 4. Propeller Stud 5. O-ring 6. Spinner Bulkhead. Nut 8. Spacer 9. Propeller 10. Bolt 11. Feed Tube 1. P-Clip 13. Sealing Ring 14. Standoff 15. Slinger Ring 16. Bonded Seal 1. Propeller Boot, De-Ice 18. Wave Washer SR_MM61_5139 5

B. Propeller - Serials w/ McCauley propeller (See Figure 61-10-) Ensure master and magneto switches are off, and ignition key is removed. (1) Removal - Propeller (a) Acquire necessary tools, equipment, and supplies. (b) Remove key from ignition. (c) Set BAT 1, BAT, and AVIONICS switches to OFF positions. (d) Move fuel selector to OFF position. (e) Place mixture control in idle cut-off. (f) Remove engine cowling. (Refer to 1-10) (g) (h) (i) (j) (k) (l) (m) Description P/N or Spec. Supplier Purpose Hoist - Any Source Hoist propeller. Sling - Any Source Secure propeller to hoist. Drain Pan - Any Source Receive waste lubricant. To ensure spinner dome is reinstalled in same clocked position, draw a reference line across spinner dome and spinner bulkhead. Remove screws and washers securing spinner dome to spinner bulkhead. Remove spinner dome from airplane. Remove spinner support and shim(s) from front of propeller hub. Position hoist and lifting sling forward of airplane and attach sling to propeller. Place a drain pan beneath propeller to catch any spilled lubricant. Serials w/ Ice Protection: Remove bolt, washer, clamp, and nut securing slinger ring feed tube to bracket on engine baffle and remove feed tube nozzle from inside of slinger ring. Loosen and remove nuts securing propeller to engine flange. Note orientation of propeller blades to engine to ensure propeller is reinstalled in correct clock position. 6

(n) (o) (p) (q) (r) Remove propeller from engine flange with care to prevent damaging the propeller mounting studs. Remove propeller from airplane. Serials w/ Ice Protection: Remove screws, washers, clamps, and nuts securing blade feed tubes to feed tube brackets. To ensure spinner bulkhead assembly is reinstalled in same clocked position, draw a reference line across spinner bulkhead assembly and propeller hub. Remove screws and washers securing spinner bulkhead assembly to propeller hub. Remove O-ring from groove inside hub at flange mounting and discard. Remove drain pan and discard spilled lubricant. () Installation - Propeller (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Hoist - Any Source Hoist propeller. Sling - Any Source Secure propeller to hoist. Degreaser - Any Source Degrease components. O-Ring A-1633-3 McCauley Propeller Systems Sealing component for McCauley propeller. Lubricant MIL-T-83483 Any Source Lubricate mounting studs and nuts on McCauley propeller. (b) Apply a light coat of engine oil to new O-ring and bore surfaces of propeller. Insert O-ring into groove inside hub at flange mounting. Verify spinner bulkhead assembly is in same clocked position as originally installed.

(c) (d) (e) (f) (g) (h) (i) (j) (k) Position spinner bulkhead to propeller hub and secure with screws and washers. Torque screws 5 to 85 in-lb (0.53 to 0.60 Nm). Safety wire screws in pairs. (Refer to 0-60) (Refer to 0-50) Serials w/ Ice Protection: Install screws, washers, clamps, and nuts securing feed tubes to feed tube brackets. Clean the engine shaft, propeller flange, and engine flange. Verify propeller is in same clocked position as originally installed. Care must be taken to avoid damaging hub or O-ring when installing propeller. Do not attempt to forcefully draw propeller onto engine flange with nuts. Using hoist and sling, align dowel pins in propeller flange with corresponding holes in engine mounting flange. Never use oil as a substitute for approved lubricant. Substitution of the approved grease with an unapproved lubricant (or no lubricant) could result in undertorquing or severe overtorquing of propeller attaching parts. Liberally apply lubricant to threads of studs and threads and faces of nuts. Install nuts securing propeller assembly to engine flange. Tighten nuts evenly to avoid hub damage. Secure propeller to engine flange and torque nuts 45 to 50 ft-lb (61.0 to 6. Nm). (Refer to 0-60) Serials w/ Ice Protection: Position slinger ring feed tube to engine baffling bracket and to inside of slinger ring. Install bolt, washer, clamp, and nut securing feed tube to engine baffling. Verify spinner dome is in same clocked position as originally installed. Position spinner support and shim(s) to front of propeller hub. NOTE Spinner installation holes should be approximately 0.05 inch (1. mm) from true alignment when shims are correctly adjusted. Lightly press spinner shell snug against support and check alignment of holes in bulkhead. 8

(l) (m) Pushing hard on shell, align installation holes with bulkhead. Secure spinner shell to spinner bulkhead with four equally spaced screws and washers. Relax force against shell and install remaining screws and washers. Serials w/ Ice Protection: Check feed tube alignment. 1 Perform Inspection/Check - Blade Feed Tube Orientation. (Refer to 30-60) Perform Inspection/Check - Slinger Ring Feed Tube Orientation. (Refer to 30-60) (n) Install engine cowling. (Refer to 1-10) 9

Figure 61-10-: Propeller Installation - Serials w/ McCauley propeller 1 10 11 9 4 5 16 3 6 11 1 ENGINE PROP FLANGE (REF) 3 15 18 3 14 13 1 LEGEND 1. Spinner. Washer 3. Screw 4. Propeller Stud 5. O-ring 6. Spinner Bulkhead. Nut 8. Spacer 9. Propeller 10. Bolt 11. Feed Tube 1. Slinger Ring 13. Propeller Boot, De-Ice 14. Support 15. Shim 16. Adapter 1. Backing Plate 18. Bracket NOTE Apply lubricant to threads of studs and threads and faces of nuts. Torque nuts to 45-50 ft-lb (61.0-6.8 Nm). Torque screws to 5-80 in-lb (8.4-9.04 Nm). Torque nuts to 30-36 in-lb (3.4-4.0 Nm). SR_MM61_5141 10

C. Adjustment/Test - Dynamic Balance Dynamic balancing reduces vibration produced by the propeller and powerplant. Small balance weights are added to the propeller/crankshaft assembly to correct for errors in mass distribution so vibration is reduced. Refer to the manufacturer's Instructions for Continued Airworthiness for pertinent information regarding dynamic balancing. D. Inspection/Check - Blade Track Blade track is the way one rotating blade tip follows the other in almost the same plane. Excessive difference in blade track may be an indication of bent blades or improper propeller installation. Refer to the manufacturer's Instructions for Continued Airworthiness for pertinent information regarding blade track. E. Inspection/Check - Loose Blades Although blades should be tight in the propeller, slight movement is acceptable if blade returns to original position when released. Blades with excessive movement, or that do not return to original position when released may indicate internal wear or damage. Refer to the manufacturer's Instructions for Continued Airworthiness for pertinent information regarding loose blades. F. Cleaning/Painting Propeller blades are painted with a durable specialized coating that is resistant to abrasion. If this coating becomes eroded, it is necessary to re-paint the blades to provide proper corrosion and erosion protection. Refer to the manufacturer's Instructions for Continued Airworthiness for pertinent information regarding painting. G. Repairs Nicks, gouges, and scratches on blade surfaces or on leading or trailing edges must be removed prior to flight. Refer to the manufacturer's Instructions for Continued Airworthiness for pertinent information regarding repairs. 11

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