Service Manual for Mooney M20J 201

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MOONEY AIRCRAFT CORPORATION BOX 72 KERRVILLE, TEXAS 78028 SERVICE BULLETIN THIS BULLETIN IS FAA APPROVED S.B. M20-230 NUMBER: REVISION A DATE: 1-16-86 SUBJECT: MODELS/ S/N AFFECTED: TIME OF COMPLIANCE: INTRODUCTION: INSTRUCTIONS: Inspection of Fuel Tank Sealant Application - ALL SERIAL NUMBERS. M20B, M20C, M20D, M20E, M20F, M20G & M22 M20J: S/N24-0001 thru 24-1498; M20K: S/N25-0001 thru 25-0854. M20J: S/N24-1499 & ON and M20K: S/N25-0855 & ON ONLY IF FUEL TANK HAS BEEN RESEALED BY FIELD PERSONNEL. Within next 50 flight hours or at next scheduled inspection. Reports have been received that fuel and water have been found trapped between ribs due to one or more rib drain holes being sealed over during tank sealing; particularly in tanks that have been resealed. General - Inspect to ensure all required rib holes are open to allow fuel (or any water) to move to the lowest area of the tank. Refer to Figures M20-230-1 thru -7 for areas to check for specified holes to be open and NOT filled with sealant compound. 1. Position airplanes in an approximate level attitude (all axis) on its landing gear. Drain fuel per instructions in applicable Service and Maintenance Manual. 2. Carefully remove fuel tank access covers on top of wing as indicated below for a particular model (reference Figure M20-230-1). NOTE In lieu of access cover removal optional methods of inspection are acceptable. However, the method MUST be demonstrated to the local FAA Inspector that a positive determination can be made that all holes are open and the intent of this Service Bulletin has been complied with. A. M20B, M20C, M20D, M20E and M20G Models: Access Cover No. 1 required. Fuel Transmitter ⑤ optional. B. M20F and M20J Models: Access Cover: CD:D:D:D required, No②H & ⑤optional. C. M20K Model: Access Cover No① and ③3 required, No. 2 & optional D. M22 Model: Access Cover No. and required, No. ②, & ⑤ optional. 3. Inspect each tank bay outboard of each rib station for trapped fuel (or any liquid) that has not drained through the passage holes at each rib station to the fuel tank sump drain area. 4. Inspect each rib station (refer to Figure M20-230-2 thru -7) to determine that all fuel passage holes are open to allow fuel to drain from outboard of rib stations to the fuel tank sump area. 5. There should be no fuel (or any liquid) trapped outboard of any rib station. If a positive determination cannot be made that fuel is not trapped and/or that all holes are open, the access covers marked "Optional" in paragraph 2, A thru D above, should be removed to complete the inspection. 6. If inspection determines all holes are OPEN in the appropriate ribs as shown in figures M20-230-2 thru -7 this portion of inspection is completed. Proceed to Step 8. 7. If inspection determines all holes are NOT OPEN in the appropriate ribs as shown in Figure M20-230-2 thru -7 proceed as follows: A. Determine exact position of rib hole)s) that are sealed over. B. Using pointed exacto knife clear hole of sealant; be careful not to cut sealant from rib flange. I S.B. M20-230A Date: 1-16-86 Page 2 of 7 C. If after clearing hole it appears that fuel can get under adjoining sealant carefully, carefully reseal area without covering hole. use PRI422B or B2 sealant. D. Proceed to Step 8. 8. Install all removed access covers per Service and Maintenance Manual and Figure M-20-230-8. Use PR1403-G-B2 or equivalent sealant as specified in S & M Manual, noting cure time. (PR1422B-1/2 or B-2 may be used if necessary) "CAUTION" Use of AN507 screws longer than 7/16 inch will puncture acorn anchor nut in access plate. REFERENCE DATA: N/A PARTS LIST: N/A FIGURES/TABLES: See Figure M20-230-1 thru M20-230-7. FUEL TANK RIBS AFFECTED M22 Wing Leading Edge Seal all stringer & rib flanges, top and bottom of tank M20F M20K m20J All Aircraft M22 M20K M22 Tank Vent Assy 2 Lower поши hom Drain Holes Lower Access Lou Access 5 W.S. 103.5 W.S. 88.75 W.S. 74.00 W.S. 59.25 W.S. 43.50 Tank Drain W.S. 24.50 Fuel filler Qty. gauge port location will vary optional on this with a/c access models cover Drain holes thru stringers on bottom side of wing to be open. (4PLCS) FIGURE M20-230-1 (VIEW LOOKING DOWN FROM TOP OF WING) Page 3 of 7 Date: 1-16-86 S.B. M20-230A Seal both sides of rib Anti-slosh valves (M20K) (2 ea.) + Reopen after sealing 1 hole (M20K) 8 holes (All other aircraft) Seal rib as shown (this side only). Seal all rivets, nut plates & flanges (ALL MODELS). W.S. 43.50 FIGURE M20-230-3 Seal both side of rib Wing Top 6 vent holes thru rib to remain open after sealing. (all models) + + 1+1 + Fuel pickup & finger strainer Inboard fuel qty. transmitter attach point W.S. 24.50 + FIGURE M20-230-2 Wing Top Page 4 of 7 Date:1-16-86 S.B. M20-230A Wing Top ++ + + Vent holes (7 plcs) +! Wing Top (1) Seal both sides of rib (M20K & M22) (All around) Seal this side only (M20F, M20J) 2) Seal all rivets, flanges & holes. Seal both sides of rib as shown. 12 holes thru rib to remain open (M20F, M20J, M20K, M22) Vent Reopen after holes sealing (3 plcs) (M20F, M20J, M20K & M22) W.S. 59.25 FIGURE M20-230-4 NOTE: This is a tank close out rib on M20B, M20C, M20D, M20E & M20G and should be sealed on inboard side only. Seal all rivets, flanges & holes. W.S. 74.00 FIGURE M20-230-5 7 holes thru rib to remain open (M20K & M22) Reopen after sealing (M20K & M22) Page 5 of 7 Date: 1-16-86 S.B. M20-230A Seal inboard side only. seal all rivets, flanges & holes. Wing Top Close out rib on M20K Seal inboard side only. Seal all rivets, flanges & holes. Vent holes (8 plcs) 15 holes to be reopened after sealing (M22 only) Wing Top (M22 Only) FIGURE M20-230-7 W.S. 88.75 (M22 Only) FIGURE M20-230-6 W.S. 103-5 Page 6 of 7 Date: 1-16-86 S.B. M20-230A Wing Top Surface Faysurface seal flange & wet install screws on all access covers View looking up from inside tank FIGURE M20-230-8 Do not use screws longer than 7/16". Seal inside surface of all access covers sealing all rivets & nutplates as shown (REF. S & M Manual)