Beechcraft Duke 60 Series Maintenance Manual

b. I ntermittent short or open mag· netic pickup in governor. c. Broken or grounded w i re in mag- netic pickup or slaved governor. d. Broken or grounded wiri ng m ag· netic pick up of master governor. a. Insuf ficie nt pick up to flyweig h t head clearance. b. Clearance between pickup and flywei ght head too great. c. Leads N o. 3 and No. 4 reversed or master and synchronizer leads reversed at Jones plug. d. I nterm i tte n t open or short in pick up or wir ing. e. Excessi ve frictio n in trimm er or f l exib le r otary shaft. f. Excessive frict ion at one end of trimmer or actuator and trim- mer were not centered when flexib le rotary sh aft was con- nected . a. Shorted or open actuator motor winding. REMARKS a. Isolate and repair faulty com - ponent. b. Repair or replace magnetic pi ckup. c. Repair or replace magnetic pi ckup. d. Repair or replace magnet ic p ick up. a. Reset pick up to give specified voltage ou tput. b . Reset pickup to give specified voltage output. c. Rewire correctly. d. Replace fa ul ty pick up or w ir ing. e. Clean, lubr icate, an d check for misal ig nm ent of shaft in guide tube. f. Cl ea n, lubr icate, and check for misalignment, recenter actuator and rod end, and re- engage shaft. a. Repl ace. 61-00-00 Page 101 No v 2/73 TROUBLE 4. Actuator not recentering. a. Actuator will not r eturn to center after shutting syn - chronizer control off in flight. b. Actuator has improper travel (should make 3 revolutions). c. Actuator dead band deter - mined by ohmmeter (pins 5 and 1 open circuit) is 7 to 26 steps wide (actuator will probably not recenter when switch is turned off). 5. Oil leaks from magnetic pickup connection in governor body. BEECH CRAFT DUKE 60 SERIES MA I NTENANCE MANUAl TROU BL ESHOOTI NG PROPELLER SYNCHRONIZER (Cont'd) PROBABLE CAUSE a. Defective centering mechanism in actuator or incorrect clear- ance between flyweight head and pickup. b. Defective centering mecha nism in actuator. c. Actuator switches stuck in depressed position. a. Defective 0 -ring between pick- up and lock nut. b. Defective gasket under lock nut. c. Nut loose. d. Defective pickup. CAUTION REMARKS a. Replace actuator or reset mag- netic pickup output as nec- essary. b. Replace. c. Replace. a. Replace. b. Replace. c. Tighten to 25 inch-pounds. d. Replace pickup. Never turn pickup into flyweight head. Check voltage output. 61-00-00 Page 102 Nov 2/73 "END" BEECHCRAFT DUKE 60 SERIES MAINTENANCE MANUAL GENERAL - MAINTENANCE PRACTICES PROPELLER BLADE BEARING LUBR!CA TION (Figure 201 ) a. Remove the prope ll er spinner dome. b. Remove the safety wire and covers from the six zerks. c. Remove one zerk from each blade. d . Lubricate the blade bearings with Hartzell DG Grease by placing the grease gun fitting on the remaining zerk of each blade. Fill until the grease is visible in the hole where the opposite zerk was removed. e. Reinstall the zerk on each blade. f. Cle an excess grease from the propeller, reinstall the grease zerk covers and safety. g. Reinstall the spinner dome . PROPELLER REMOVAL a. Remove the attaching screws and remove the spinner dome and cap. b. Remove the retaining screws and the nose cowling fairing channels from the base of the propeller hub. c. Remove the safety wire and remove the nuts around the propeller hub base with the special propeller torque wrench adapter (PI N 922 60·960000). NOTE When propeller deicer equipment is installed, it is necessary to disconnect the terminal wires on the starter ring gear. d. Pull the propeller carefully from the mounting studs. CAUTION Do not damage the threads on mounting studs and be careful not to damage the spinner. PROPELLER INSTALLATION a. Install a new 0-ring in the propeller flange exten- sion and carefully position the propeller on the mounting studs. Install nuts and washers and snug down in a diagonal pattern. Torque nuts to 90 to 100 foot-pounds and safety wire. CAUTION Do not damage the threads on mounting studs and be careful not to damage the spinner. NOTE When using the special propeller torque wrench Propeller Servicing Point Figure 201 adapter, the torque valve must be recomputed. (Refer to Chapter 20·00·00.) b. Connect propeller deicer terminal wires, if instal- led, on the starter ring gear. c. Install the nose cowling fairing channels with at· taching screws. d. Position the spi nner dome and cap , and install the attaching screws. e. Connect a dry air or nitrogen supply line to the air valve and fill to 80 psi for HC-F3YR-2/C7479B-2R, HC-F3YR-2F/FC7479-2R, HC-F3YR-2/C7479-2R, or HC - F3YR-2F/FC7479B-2R propellers. This should be done at 70 degrees F. In crease 2 psi for every 10 degrees of tempera - ture increase. Decrease 2 psi for every 10 degrees of tem- perature decrease. Fill to 41 psi for HC-F3YR-2UF/7479-2R or HC-F3YR-2UF/FC7479B-2R propellers. This should be done at 70 degrees F. NOTE 70 to 100 degrees F. Pressurize dome to 41 psi 40 to 70 degrees F. Pressurize dome to 38 psi 0 to 40 degrees F. Pressurize dome to 36 psi 61-00-00 Page 201 Oct 19/ 77 BEECH CRAFT DUKE 60 SERIES MAINTEN ANCE MAN UAL SECTION A-A ST O - H9 · 3 Minor Propeller Blade Repair Figure 202 PROPELLER BLADE REPAIR. (Figure 202) Minor nicks, dents and gouges may be dressed out by ap- proved line personnel. Blend any nicks or gouges into the leading edge with smooth curves, and generous radii as shown in Figure 202. Reanodize the reworked area by the chromic acid process only. PROPELLER GOVERNOR REMOVAL a. Remove cotter pin, nut, washer and bolt attaching the ad ju sting rod end to the governor. b. Disconnect the oil line, from th e outboard side of the governor. c. Remove the nuts and washers around the governor base. Remove the governor and cover the engine boss. PROPELLER GOVERNOR INSTALLATION (Figure 203) a. Remove the cover from the engine boss; install a new gasket with the raised portion of the screen facing up . b . Align the governor sp line with the engine drive spline, and insta ll washers and nuts. Diagona lly torque the nuts to 150 inch-pounds. c. Connect the oil line to the outboard side of the governor. d. Install the bolt, washer, nut and cotter pin attaching the adjusting rod end to the governor. NOTE To insure proper ad just ment , do not turn the adjusting rod end when in sta ll ing the governor. 60 - 254 -1 Propeller Governor Installation Figure 203 61-()()-()() Page202 Oct 19m BEECH CRAFT DUKE 60 SERIES MAINT ENANCE MANUAL PROPELLER GOVERNOR ADJUSTMENT (Figure 203) The propeller governor can be adjusted for high and low rpm setting and a feathering adjustment. The high rpm adjustment must be checked while the aircraft is in flight. Observe the take-off rpm to see if it exceeds the redline figure. If excessive rpm is observed, land the plane and adjust the high rpm screw inward to reduce the rpm to the redline figure. The high rpm adjustment screw is located at the rear of the governor just forward of the speed adjusting control lever. One complete revolution of the screw reduces the propeller rpm by approximately 25 to 30 revolutions. FEATHERING ADJUSTMENT To adjust the feathering action, pull the contro l back through the detent and observe the point at which the rpm setting begins to fall off sharply, then bring the propeller back to low rpm. The point at which propeller feathering starts should be at 2.100 rpm.lf adjustment is required turn the square-head screw on the end of the governor control shaft inward or outward to correct the setting. One half revolution of the screw inward will lower the feathering rpm approx imately 100 revolutions. {See Figure 203.) LOW RPM ADJUSTMENT (Figure 204) The low rpm adjustment is made while the airplane is on the ground. To make this adjustment, pull the propeller lever back against the detent. Slowly move the throttle control Ilever forward until the rpm stabilizes. Observe the rpm set- ting. If the rpm varies from the specified low rpm setting of 2350 rpm the low rpm setting must be adjusted. The low rpm adjustment is made on the detent rod, which is located be· hind the instrument panel on the governor control MIXTURE CONTROL LEVERS--• PROPELLER CONTROL LEVERS THROTTLE CONTROL LEVERS LOW RPM ADJUSTMENT Propeller Low RPM Adjustment Figure 204 60 . tS9 . t 61.00-00 Page 203 Oct 19177 BEECHCRAFT DUKE 60 SERIES MAINTENANCE MANUAL Unfeathering Accumulator Figure 205 linkage. To increase the setting, lengthen the rod; to decrease the setting, shorten the rod. PROPELLER ADJUSTMENT For high and low pitch adjustments, service, overhaul and maintenance procedures refer to the manufacturers app licable FAA Approved Propeller Manuals. PROPELLER ACCUMULATOR The propeller accumulators are located on the lower rear section of each engine. The accumulators should be inspected every 100 hours and charged with dry air or nitrogen to 125 psi. PROPELLER ACCUMULATOR REMOVAL (Figure 205) a. Check the propeller control lever for unfeathering (low pitch) position, to release accumulator pressure. CAUTION This system has approximately 300 psi of pressure with the propeller in full-feather position. b. Remove the oil line from the end of the accumulator. c. Remove the four clamps that hold the accumulator mount ing brackets to the engine mount and remove the accumulator. 61-00-00 Page 204 Nov 2n3 Propeller Synchronizer Actuator Figure 206 PROPELLER ACCUMULATOR /NSTALLA TION a. Position the accumulator against. the engine mount Propeller Synchronizer Trimmer Figure 207 BEECH CRAFT DUKE 60 SERIE S MAINTENANCE MANUAL and install the four attaching clamps. b. Connect the oil line to the end of the accumulator. c. Charge the accumulator with dry compressed air or nitrogen to 125. SYNCHRONIZER FUNCTIONAL TEST {Figure 206) Proper operation of the propeller synchronizer can be determined by the following method. Turn the synchronizer on in the normal manner, then decrease the right propeller rpm in small increments. Both propellers should decrease together until the actuator reaches the end of its travel, then the left propeller should stabilize its rpm while the right continues to decrease. Increase the right propeller rpm unt il both propellers co mm ence to increase rpm together. Turn the system OFF. An unsynchronized condition will develop as the actuator runs to its midrange position. When the synchronizer is turned ON, the left propeller should again synchronize with the right. SYNCHRONIZER RIGGING {Figure 207) a. Di sconnect the flexible trimmer shaft from the actuator. b. Rotate the shaft in one direction until it reaches the internal stop in the trimmer. Check the propeller control to assure that it has full travel in both directions. c. Rotate the shaft in the other direction until it reaches the stop, counting the turns. Again check the prope ll er control for full travel in both directions. d. Rotate the shaft to the center of its range. e. Count total turns available in the actuator motor and turn it to the center of its range. Th e motor can be tu rned by inserting a square shaft end into the drive. f. With both the trimmer and the actuator motor centered, connect the flexible shaft. g. Rig the prope ll er cont rols in the normal manner. SYNCHRONIZER CHECKS These checks will help locate the source of trouble should the synchronizer system malfunction. If no malfunctions are found among the units being tested, the transistorized contro l box is probably the source of trouble. An ohmmeter and voltmeter are required to conduct the tests outlined below. SYNCHRONIZER WIRING CHECK {Chart 201 l a. To e lim in ate the most obvious causes fo r malfunction, make sure that the aircraft master switch is ON, that the system circuit breaker is not tripped, and that the J ones plug receptacle is properly mated with the plug in the aircraft electrical system. b. Unplug the control box, turn the aircraft master switch OFF, and pull the synchronizer circuit breaker before proceedi ng further wit h t hese checks. CH AR T 201 SYNCHRON IZER R ES ISTANCE CH ART TEST BETWEEN RECEPTACLE NUMBERS: With actuator centered Open circuit 5 and 1 {high resistance) Open circuit 5 and 3 {high resistance) Open circuit 5and 4 {high resistance) 4 and 1 6.5 to 8.5 ohms 4 and 3 13 to 17 ohms 3 and 1 6.5 to 8.5 ohms OBTA IN With actuato r un centered 180° Turn clockwise Counterclockwise {facing drive end) {facing drive end) to uncenter to uncenter 6.5 to 8.5 ohms 6.5 to 8.5 ohms Closed circuit 0 to 1 ohm 13 to 17 ohms Closed circuit 13 to 17 ohms 0 to 1.0 ohms 6.5 to 8.5 ohms 6.5 to 8.5 ohms 13 to 17 ohms 13 to 17 ohms 6.5 to 8.5 ohms 6.5 to 8.5 ohms 61 -00 -00 Page 205 Nov 2n3 I BEECHCRAFT DUKE 60 SERIES MA INTENAN CE MAN UAL c. Complete resistance checks. (See CHART 201 .) CAUTION Zero the ohmmeter and read on the X1 to X10 scale during the following checks. Do not use a probe greater than .045 inch in thickness. Insert and remove the probe carefu ll y to avo id damag- ing the pin connectors. NOTE Later propeller governors are equipped with an im proved type of magnetic pickup. The new type has a solid steel pickup end; while the old type has a visible ceramic core. Any combination of new or old magnetic pickups is acceptable be- tween engines. system. If the synchronizer system still malfunctions, the source of trouble is probably either in the control box itself or is the result of a mechanical failure of the flexible shaft or governor speed trimming device. j. Check the speed pickups mounted on the governor for oil leaks or looseness. k. Remove the flexible rotary shaft and rotate the actuator th rou gh i ts range. It should stop positively at each end of i ts range and should rotate freely except for the ratcheting effect of the detent whee l. The normal output torque is 15 ounce-inches. Make sure the actuator is re- turned to the center of i ts range. Adjust the governor trimmer by turning the squared end of the flex shaft by hand (a turning fixtu re may be required to turn the shaft in the direction to decrease rpm). Under any circumstances, a turning fixture 1/4 inch in diameter should be adequate for rotating the trimmer freely throughout i ts range. After thus verifying that the friction between the rotat- ing parts is at an acceptable level, recanter the trimmer and attach it to the actuator. I d. Complete the following checks. If the response of the system to the preceding checks has been satisfactory, the airplane is ready for flight. 1. Using an ohmmeter, test that the resistance between pin receptacles 7 and 8 of the Jones cinch socket (see Figure 208) is 52 to 68 ohms (new pickup), or 90 to 110 ohms (old pickup) with pin receptacle 6 disconnected at the pickup. 2 . Check that the resistance between pin recep- tacle 6 and 8 is 52 to 68 ohms (new pickup), 90 to 110 ohms (old pickup) with pin receptacle 7 disconnected at the pickup. e. Make the following checks with an ohmmeter con- nected to the pin receptacles of the Jones cinch socket (PI N 233032). 1. Check that an open circuit (very high- resistance) exists between pin receptacle 8 and airplane ground and between pin receptacle 2 and ground. 2. Check that a closed circuit (zero ohms) exists between pin receptacle 1 and ground. f. Turn the airplane master switch ON and reset the synchronizer circuit breaker , but leave the control box unplugged. g. Using a DC voltmeter, check that the voltage be- tween pin receptacles 1 and 2 is the same as the supply voltage and that the polarity of pin number 1 is negative while that of pin number 2 is positive. h. Using a 5000 ohm/volt AC voltmeter and with the engines running near cruise rpm, probe pins 6 and 8 for pickup voltage on the left (slave) engines and pins 7 and 8 for pickup voltage on the right (master) engine. These values should be between 1/2 volt minimum and 3 volts maximum. i. When the system is in compliance with the preced- ing check values, pl ug the cont rol box into the synchronizer 61-00-00 Pa ge 206 O ct 19/77 FLIGHT CHECKS a. Check the effect of rpm and/or power setting (par- ticularly in the lower cruise range) on synchronizer action. If operation at lower rpm resulted in improved synchronization, inspect the drives to the governors. b. Reduce the electr ic al lo ad and turn off the generator and all other electrical units, except the master switch, and synchronizer if synchronizing improves, abnor- mal voltage spikes on the airplane bus from some other electrical accessory may have been upsetting the syn- chronizer. Isolate the offending accessory and repair it. If the trouble lies in the control box, replace it. 100-HOUR INSPECTION PROPELLER - Inspect the propeller for nicks, dents, cracks, evidence of leakage, condition and security. AIR DOME - Check the propeller air dome for correct pressure. DEICER BOOTS - Check the boots for hot spots, exposed heating element wi res, tears and security to the blades. SPINNER AND BULKHEAD - Check the spinner and bul- khead for nicks, dents, cracks, condition and security. Check deicer boot wires for security at the starter ring gear. BEECH CRAFT DUKE 60 SERIES MAINTENANCE MANUAL PROPELLER GOVERNORS- Inspect the governor for oil leakage, condition and security. CONTROL LEVERS - Check levers for smooth and free movement and cushion. Check controls at the governor for security and full travel against t he stops. ACCUMULATOR - Inspect for oil leakage, condition and security. Check air pressure. SYNCHRONIZER - Check all components of the system for condition and security. Any discrepancies noted during ground or flight should be isolated using the troubleshooting chart and the wiring check. Consult Woodward Governor Bulletins 33032A and 33049C for further detailed information. "EN D " 61-00-00 Page 207 Nov 2n3