SERVICE BULLETIN - ENGINE INDICATING - TACHOMETER SIGNAL STABILIZATION

that distortion, tools, rags or any other loose articles or foreign matter that could impede the free movement and safe operation of the system are not present, and that the systems and installations in the work area are clean. (1) Open cowling(s). Refer to the applicable airplane Maintenance Manual or Shop Manual. (2) Remove all power from the airplane and disconnect the battery. Display warning notices prohibiting reconnection of airplane electrical power. (3) Remove the glareshield to gain access. Refer to applicable airplane Maintenance Manual or Shop Manual. (4) Remove the tachometer(s). Refer to applicable airplane Maintenance Manual or Shop Manual. (5) For Model A36 and B36TC airplanes, refer to Figure 1 and accomplish the following to install a P/N RLR20C3001GS resistor and jumper wires to the tachometer indicator wiring harness: (a) Locate wires E35A20 and E37A20 in the wire bundle connected to plug P25 on the M13 TACHOMETER INDICATOR. (b) Remove wire E37A20 from pin 3 and wire E35A20 from pin 4 of plug P25 using P/N 305183-R extractor tool. SB 77-3304 5 of 9 SERVICE BULLETIN OPTIONAL Issued: May, 1999 (c) Slide a section of P/N 106242C44-00400 heat shrink tubing over both wires, using enough tubing to cover the resistor and wire splices. Temporarily slide the tubing past the installation area. (d) Crimp a P/N 201328-1 socket to one end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 6.5 inch maximum length) and install at pin 3 of plug P25. (e) Slide a section of P/N 106242A26-00008 tubing over each lead wire of the P/N RLR20C3001GS (R5) resistor. (f) Mate the opposite end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 6.5 inch maximum length) to one end of P/N RLR20C3001GS (R5) resistor and wire E37A20 using a P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (g) Crimp a P/N 201328-1 socket to one end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) and install at pin 4 of plug P25. (h) Mate the opposite end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) to the opposite end of P/N RLR20C3001GS (R5) resistor and wire E35A20 using a P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (i) Position sealing sleeves over each P/N M81824/1-2 wire splice and shrink the sealing sleeves on each wire splice using a suitable heat source per best shop practice. (j) Slide heat shrink tubing over P/N RLR20C3001GS (R5) resistor, making sure it extends a minimum of 0.25 inch beyond the P/N M81824/1-2 wire splices. Apply a suitable heat source to heat shrink tubing per best shop practice. (k) Connect plug P25 to the M13 TACHOMETER INDICATOR. (l) Install the tachometer. Refer to the airplane Maintenance Manual. (m) Install the glareshield. Refer to the airplane Maintenance Manual. (n) Proceed to step 7 for follow-on procedures for Model A36 and B36TC airplanes. (6) For Model 58 Baron series airplanes, refer to Figure 2 and accomplish the following to install a P/N RLR20C3001GS resistor and jumper wire to each of the tachometer indicator wiring harnesses: (a) Locate wires E35A20 and E37A20 in the wire bundle connected to plug P25 on the M13 L (LEFT) TACHOMETER INDICATOR. (b) Remove wire E37A20 from pin 3 plug P25 using P/N 305183-R extractor tool. (c) Locate existing wire splice with wires E35A20, E82A20, and E35B20 installed. Cut the wires on both sides of the wire splice per best shop practice. (d) Slide a section of P/N 106242C44-00400 heat shrink tubing over the wires, using enough tubing to cover the resistor and new wire splices. Temporarily slide the tubing past the installation area. (e) Crimp a 201328-1 socket to one end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) and install at pin 3 of plug P25. (f) Slide a section of P/N 106242A26-00008 tubing over each lead wire of the P/N RLR20C3001GS (R5) resistor. SB 77-3304 6 of 9 SERVICE BULLETIN OPTIONAL Issued: May, 1999 (g) Mate the opposite end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) to one end of P/N RLR20C3001GS (R5) resistor and wire E37A20 using a P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (h) Insert the other resistor lead and wire E35A20 into one end and wires E35B20 and E82A20 into the opposite end of a new P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (i) Locate wires E34A20 and E36C20 in the wire bundle connected to plug P26 on the M12 R (RIGHT) TACHOMETER INDICATOR. (j) Remove wire E34A20 from pin 3 of plug P26 using P/N 305183-R extractor tool. (k) Locate existing wire splice with wires E36C20, E83A20, and E36A20 installed. Cut the wires on both sides of the wire splice per best shop practice. (l) Slide a section of P/N 106242C44-00400 heat shrink tubing over the wires, using enough tubing to cover the resistor and wire splices. Temporarily slide the tubing past the installation area. (m) Crimp a P/N 201328-1 socket to one end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) and install at pin 3 of plug P26. (n) Slide a section of P/N 106242A26-00008 tubing over each lead wire of the P/N RLR20C3001GS (R6) resistor. (o) Mate the opposite end of new jumper wire labeled JMPR 22 (P/N 131681AA22-9, 3.0 inch maximum length) to one end of P/N RLR20C3001GS (R6) resistor and wire E34A20 using a P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (p) Insert the other resistor lead and wire E36C20 into one end and wires E36A20 and E83A20 into the opposite end of a new P/N M81824/1-2 wire splice. Crimp with appropriate crimp tool. (q) Position sealing sleeves over each M81824/1-2 wire splice and shrink the sealing sleeves on each wire splice using a suitable heat source per best shop practice. (r) Slide heat shrink tubing over each P/N RLR20C3001GS (R5 and R6) resistor, making sure it extends a minimum of 0.25 inch beyond the P/N M81824/1-2 wire splices. Apply a suitable heat source to heat shrink tubing per best shop practice. (s) Connect plugs P25 and P26 to their respective M13 L TACHOMETER INDICATOR and M12 R TACHOMETER INDICATOR. (t) Install the tachometers. Refer to applicable airplane Maintenance or Shop Manual. (u) Install the glareshield. Refer to applicable airplane Maintenance or Shop Manual. (7) Ensure all work areas are clean and clear of tools and miscellaneous items of equipment. (8) Reconnect the airplane battery and restore power. (9) Close cowling(s). Refer to the applicable airplane Maintenance Manual or Shop Manual. (10) Perform an operational checkout of the tachometer installation to make sure the system is indicating properly. (11) Remove warning notices. (12) Return airplane to service. SB 77-3304 7 of 9 SERVICE BULLETIN OPTIONAL Issued: May, 1999 B. Spares Not applicable. C. Record of Compliance Upon completion of this Service Bulletin, make an appropriate maintenance record entry. SB 77-3304 8 of 9 SERVICE BULLETIN OPTIONAL Issued: May, 1999 B330401.AI E33A20 P25 JMPR 22- L23C22 L23E22 33-13-01 73-31-01 P80 1 2 6 5 9 8 3 4 7 I E31B20 M13 TACHOMETER INDICATOR JMPR 22- 2 JMPR 22- 1 R5 3K .5W L171A20 91-17-01 E35A20 J80 H E31A20N E37A20 E38A20 91-17-01 (ADD) 1 MAXIMUM LENGTH 3.0 INCHES 2 MAXIMUM LENGTH 6.5 INCHES Resistor Addition for Tachometer Signal Stabilization, Model A36, B36TC Bonanza Figure 1 SB 77-3304 9 of 9 SERVICE BULLETIN OPTIONAL Issued: May, 1999 B330402.AI 3K .5W R6 P26 P25 R5 E35A20 6 3 4 9 8 I I 1 7 2 5 6 4 8 9 3 5 2 7 1 M12 R TACHOMETER INDICATOR M13 L TACHOMETER INDICATOR JMPR 22- 1 E36C20 E31B22 L23D22 L171A20 L171C20 L23C22 E38A20 E82A20 E35B20 E37A20 L23E22 E171B20 E34A20 E83A20 E36A20 61-41-01 91-17-01 33-13-01 73-31-01 61-41-01 3K .5W JMPR 22- 1 1 MAXIMUM LENGTH 3.0 INCHES JMPR 22 JMPR 22 Resistor Additions for Tachometer Signal Stabilization, Model 58 Baron Figure 2