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SERVICE MANUAT Model Fl Fixed-P itch Propel lers INTRODUCTION This manual contains routine inspection, meintenenee, overhaul, and minor repair procedures which can be aecomplished by propeller servicing facilities. These instructions are intended to suPplement the critetia set forth in Civil Air Regulations part 18 and Civil Aeronautics Manual 18. In no case ere they to be construed or interpreted es overriding or contradictory to the material in the regulations or manual. t The use of this manual by any propeller servicing facility shall not, under eny circrrmstances be lnterpreted or construed as en approval of the facility by Flottorp Manufacturing Coupany. This manual revised September 26, 1962, and the following have been approved by the FAA. addenda FAA Approrred. Chief , Engr. Approval -1- \*- & Ivlfg, Braneh Date
TABLE OF CONTENTS Page SECTION I Specifications A. B. and Deseription. . . . . . 3 GeneralSpecifications. . Installations. 3 3 SECTION II Service Tools and Equipment. 3 SE C T ION III P g r i o d i c I n s p e c t i o n. . . . . . . . . . . . . . . . 4 SECTION IV M a i n t e n g n c ea n d R e p a i r . . . . . . . . . . . . . 4 A. B. 4 5 C. C l e a n i n g. . . . . . . . . . . . . . . . . . . . . . . 5 D. E. I n s p e c t i o n. . . . . . . . . . . . . . . . . . . . . R e p a i r s. . . . . . . . . . . . .o Checking Propeller Track in Shop Checking Prope1ler Track on the Aircraft. 6 6 H. P a i n t i n g. . . . . . . o . . . . . . . . . . . . . . . l I. B a l a n e i n g. . . . . . . o . . . . . . . . . . . . . . 8 F. G. SECTION V-- Propeller Installation, 0-320-D2B E n g i n e. . . . . . . . . . . . Propeller Removal, 0-320-D2B Ergine . Parts List 7 7 9 September 26, L962 -2- .{ L -l
SECTION I SPECIFICATIONS ATID DESCRIPTION A. G e n e ra l Sp e c i f i c a ti ons Type Material Engine Shaft Fi xed-P i tch Aluminuur Al loy SAE Flanged A S L27 N o. 2 50 in. to 70 in. 30.5 lb. Pitch Range Weight B. Installations Propeller D i a m et er P ropel l er Aircraft Engine Rating Beeeh Musketeer 23 Lycoming O-320-D2B 160 HP 2700 RPM Model FlC 7660-2 fr 74 SECTIONII SERVTCETOOLSAr{D EQUIPMENT No special tools of these propellers. are required for maintenance and overhaul Standard equipment necessary is: Propeller Assembly Tab1e Suspension Type Propeller Balancer September 26, 1962 -3- --- t 74
S EC TION III PERIODIC INSPECTION NATURE OF INSPECTION S ec ur it y o f m o u n ti n g bolts safetied Minor nicks, INSPECTION TIME a n d m o u n t i ng scratches, Postfl ight and cracks Postf 1ight CAUTION Due to the high stresses to which the propeller blades ere subjeeted, their careful maintenance is vitally important, particularly on the leading edge of each b l a d e fro m th e ti p i nboard for approxi matel y 8 inches. A11 nicks and scratches must be repaired before the airplane is flor nr. Nicks and scratches set up coneentrations of stress which can exceed the strength of the blade material; the result will be a crack and premature failure of the blade Corrosion, cracks nicks, dents beyond permissible and limits 30 hours O v er haul At engine overhaul SECTION IV MAINTENANCE AI\D REPAIR In general, all instruetions and procedures outlined in CAM 18 for all inspection, maintenanee, and repair should be adhered to. Balancing the propeller should be performed by an FAA certificated propeller repair station sinee equipment neeessary to accomplish the aecuracy required is not normally available to line maintenance personnel. A. Propeller 1. Installation, Without 0-320-D2B Engine Spinner a. R o ta te th e ligns with b. Slide the propeller onto the engine shaft indexing it so that the blades lie aPprox. at the 5 o'clock and 11 o'clock positions. c. Install evenly, d. Secure the bolts S ept em ber 2 6 , e n g i n e unti l the TC #L mark on the starter the dot on the engine starter housing. the 6 propeller retaining bolts a n d to rq u e to 300 i neh-pounds. with safety L962 -4- wire. and washers, gear tighten a-
2. B. a. Rotate the engine until the TC #L mark on the starter with the dot on the engine starter housing. b. Sl i d e th e s pi nner rear bul khead onto the engi ne s o th a t th e tabs w hi ch have the corners cut off the 6 o'c1ock and the L2 o'clock positions. c. Sl i d e th e p r opel l er onto the engi ne shaft i ndexi ng i t so t hat the blades 1ie approx. at the 5 o'clock and 11 o'clock positions. d. Insert the 6 propeller retaining bolts and washers into the h o l e s i n th e spi nner front bul khead, and sl i de the assem bly onto the propeller, aligning the bulkhead cutouts with the blades. Tighten the bolts evenly and torque to 300 inch-pounds. e. Secure the bolts f. slide the spinner dome onto the bulkheads, 1 0 re ta i n i n g screw s and w ashers. Propeller 1. 2. C. W i t h B e e c h 1 6 9 - 9 1 0 0 3 0S p i n n e r A s s y . with safety gear aligns shaft indexing l i e appr ox. at it wire. and install the Removal, 0-320-D2B Engine Without Spinner a. Remove the 6 propeller b. Remove the propeller retaining from bolts the engine and washers. shaft. With Beech 169-910030 Spinner Assy. a. R e mo v e th e and remove b. Remove the 6 propeller retaining s p i n n e r fro n t bul khead. C. R e mo v e th e p ropel l er shaft. 10 spi nner the dome. dome retai ni ng and the bolts spi nner screw s and w ashers, and washers, rear bul khead and the from t he engine Cleaning For eleanitg, use warm fresh water and soap, unleaded gasoline, or kerosene, and suitable brushes or cloths. After the blades have been cleaned, all cleaning substances must be i mmedi atel y removed. Soap in a n y fo rm s h o u l d b e removed by thoroughl y ri nsi ng w i th fresh w at er , after which all steel surfaces should be dried and eoated with clean engine oil. S c ra p e rs , por rer buf f ers , steel brushes, and any other t ools or substances that will scratch or otherwise mar the surface must not be used on blades. In special eeses where a high polish is desired, a good metal aircraft polish may be used, however, upon completion of the polishing, all traees of polish should be immediately removed. In no instance shal1 the blades be polished with a power buffer. September 26, L962 -5-
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D. I ns pe c t i o n In addition to the methods discussed in CAM 18, another method for detecting craeks in blades is as follows: Clean the blade carefully thoroughly, using a clean E. with carbon tetraehloride air blast if necessarv. satisfactorv and drv 2. Prepare ? solution of SWonon-toxic, non-corrosive h a s f l ,tr,o re s e e n t q u a l i ty, and 50% kerosene. 3. Completely immerse the blade in the solution and allow it to remain f or a minimum of thirty minutes. Af ter this period, remove the blade from the bath and allow the excess fluid to drain. Spray the blade with carbon tetrachloride to completely remove the remaining solution. A11ow the blade to stand for fifteen minutes so that the solution will bleed out of anv cracks present. 4. Carefully inspeet the entire blade under a near-ultraviolet light source. The inspection must be conducted in a darkened booth or room. Solution bleeding from a surface crack will show up under the light as a bright fluorescent Iine. orl which Repairs Major and minor repairs only within the limitations o f C A D {1 8 are permissible. In any case, do not exceed the repair limits for width or thickness as specified in Table I. TABLE I B],ADE REPAIR LIMITS Blade Station (Distance from hub center l ine , in. ) 7 11 16 22 27 33 13/32 3/ 3 2 2t/32 L3/64 3/4 19/64 Min imum R epai red l /i dth 5.060 * Min imum R epai red Thi ckness s - :a c ' l s - s z o*- 5 ' ) s q s . r -o- ' f-. t ( ' F A ' t . / S ) 5 .270 4/.55 ( 4 . 75 0 3 . 7 4 0 - 3. J E 2, 1.500 ,t : J 1 . 1 0 0 i- , C ? ? 7 .7go 'i 1 .604 ) .443 3 ' i / .294 a l o i The only aeceptable methods of repairing cuts, nicks, cracks, etc., ar e th o s e b y w h i c h th e d a m aged popti on i s removed to l eave a smooth well-faired surfaee. Methods which attempt to relocate metal by c old-w o rk i n g to e o v e r o r c onceal the defect rather than remove the damage are not permissible. September 26, L962 -6-
F. G. Cheeking Propeller Track in the Shop 1. Mount it on a protractor 2. Plaee e stationary object make a mark on the objeet it. 3. Rotate the propeller with this blade. 4. Measure the distance between the centerlines The allowable difference is L/8 inch. 5. If the distance is greater than I/8 inch, the propeller be sent to an FAA certif icated propell.er repair station further inspection and repair. Checking Propeller beneh mandrel. at the tip of one of the blades and where the eenter of the blade touches 180 degrees and repeat the above operation of the two marks. should for Track on the Aircraft The following precedure should not be attempted unless it is knourn that the engine shaf t is not out of l ine. The airplane must be in a hangar where air currents will. not rock it. Use the following procedure: H. 1. Place a stationary object at the tip of one of the blades and make a mark on the object where the center of the blade touches it. 2. Rotate the propeller with this blade. 3. Measure the distance between the eenterlines The allowable difference is I/8 ineh. 4. If the distance is greater than L/8 inch, the propeller should be sent to an FAA certificated propeller repair station for further inspection and repair. 180 degrees and repeat the above operation of the two marks. Pa int ing Carefully touch up minor paint damage due to repair operation or hlear. Propellers requiring complete repainting shal1 f irst be stripped of their remaining paint and then painted according to the following instructions : l. All surfaces to be painted shall be thoroughly cleaned innnediately before the application of the primary coat. Use benzol, carbon tetrachloride or some other suitable organic solvent. Use same care when applying second topcoat, that preceding topcoat has not become soiled. 2, The flat face of the blade will receive a three-coat application; one Primary coat and two topcoats. Mask-off the camber face of the blade, using any suitable method. September 26, L962 7-
3. I. The primer sha1l be zinc chromate thinned with to1uo1. A pp l y i t e v e n l y o v e r th e surfaee of bl ade avoi di ng a heavy c oa t. A 1 1 o w to d ry fo r at l east 30 mi nutes at room temperature in a dust free atmosphere. Balanc ing Following any appreciable blade repair, the propeller must be balanc ed . T h e s u s p e n s i o n ty p e bal ancer i s recommended beeause of the direct indication of the direction in which the propeller is out of balance, to delieately adjusted balance ways are necesssry, and because of its ease of interpretation. s m a11 a m o u n ts o f u n b a l a n c e c an be corrected by sprayi ng an additional light coat of black paint on the flat face of the light blade. Do not use heavy applications of paint for this purpose, since unbalance will re-occur as soon as the paint erodes away. " A ppr ec ia b l e u n b a l a n c e c a n b e corrected onl y by removi ng materi al . This ean best be accomplished by abrasive grinding and polishing, and s ho u l d b e d o n e o n l y o n the camber si de of each bl ade and on the s ides o f th e h u b . M e ta l re moved must be hel d w i thi n the l i sri ts in T able I . S i d e w a y s u n b a l a n c e can often be best corrected by removal of m et a l o n th e c a mb e r s i d e c l ose to the l eadi ng edge of one bl ade and t o th e tra i l i n g e d g e o f t he other bl ade on the heavy si de. It is important not to leave any abrasive seratches across the blade. Always finish the polishing operation so that any abrasive marks that m ay r em a i n ru n a l o n g th e b l a d es, not across them. In any case, remove all deep scratehes. F or t hose w h o h a v e c o n v e n ti o n a l bal anci ng arbors, adapter cones, and parallel knife edges, the proeedure is identical to the preceding ins t r uc t io n s . H o w e v e r, i n s te ad of unbal ance bei ng i ndi cated by a disc indicator, it is indicated by a tendency of the propeller to r ot at e to w a rd th e h e a v y s i d e . It shoul d be noted that the kni fe edges, arbors, and adapters must be free from all foreign matter, and m us t be s mo o th a n d tru e . T h e w ays shoul d be checked for paral l el i sm prior to balancing the propeller. September 26 , L962 -8-
SECTIONV PARTS LIST Part No. I t em N o . 1 2 3 4 5 6 7 #* #* #* @ # # : Nomenclature FlC7660-2 169-910030-5 169-910030-3 169-910030-1 336 AN960-616 AIit525-10R8 AIit960-10 MS20995C41 No. Req. Propeller Rear Spinner Bulkhead Front Spinner Bulkhead Spinner Dome BoIt Washer Serew Washer Safety Wire * Beech Aircraft @ Flottorp # O p ti o n al Corp. Part No. Mfg. Co. Part No. E qui pment "Q" o I I \ l-----,-----./ ---' Figure Propeller September 26, 1.962 -9- 1 Assenbly o 1 1 1 1 6 6 10 10 as req.
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Propeller Propeller Diameter Aircraft Engine Rating Model fr Beeeh Lycoming 160 HP FlC 7660-2 74 74 Musketeer 23 O-320-D2B 2700 RPM SECTION II SERVTCE TOOLS Ar{D EQUIPMENT No special tools are required for maintenance and overhaul of these propellers. Standard equipment necessary is: Propeller Assembly Tab1e
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