Service Bulletin - AWS

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SB 2X-34-08 R1 1 of 4 Cirrus Design Corporation 4515 Taylor Circle Duluth, Minnesota 55811 PH (218) 727-2737 Cirrus Design Corporation cannot be responsible for the quality of work performed by others while fulfilling the requirements of this service bulletin. Procedures specified in this service bulletin must be accomplished using industry standard maintenance practices and applicable government regulations. Service Bulletin COMPLIANCE Optional: Accomplishment of this Service Bulletin is at the owner’s option. This Service Bulletin was revised to include a procedure for verifying that the OAT probe is adequately grounded and to provide instructions for improving the conductivity of the connector backshell. Operators who have successfully complied with the original release of this Service Bulletin, dated 21 May 2004, need take no further action. EFFECTIVITY Note: Installation of the OAT Probe Ground Wire in accordance with Cirrus Design Drawing Num- ber 70074-001 satisfies the requirements of this Service Bulletin. Cirrus Design SR20 serial numbers 1005 thru 1424 with Avidyne FlightMax EX5000 and Engine Monitor- ing. Cirrus Design SR22 serial numbers 0002 thru 0964 with Avidyne FlightMax EX5000 and Engine Monitor- ing. APPROVAL FAA approval has been obtained on all technical data in this Service Bulletin that affects type design. PURPOSE The Outside Air Temperature (OAT) temperature sensor probe may become statically charged due to pre- cipitation static. This condition results in the buildup of static electricity that could cause the sensor inter- face to shutdown temporarily. Installation of ground wire will relieve static electricity buildup on the OAT probe thereby reducing the likeli- hood of sensor interface shutdown. DESCRIPTION This Service Bulletin contains instructions for the installation of ground wire to the OAT probe for the Avi- dyne engine instrument system. WARRANTY INFORMATION Cirrus Design will cover parts and labor costs for this Service Bulletin if the work is accomplished within the standard airplane warranty period and the work is accomplished at an authorized Cirrus Design Service Center or at the Cirrus Design factory. The Warranty Claim Form must be properly filled out and submitted to Cirrus Design in order to obtain a warranty credit. ATA 34-10: Flight Environmental Data/Pitot-Static Systems OAT Probe Ground Wire Installation 21 May 2004 SB 2X-34-08 R1 Model SR20 and SR22 Issued: 06 May 2005 Revised: SB 2X-34-08 R1 2 of 4 Revised: 06 May 2005 MANPOWER REQUIREMENTS Approximately 1.5 manhours are required. OTHER PUBLICATIONS AFFECTED SR20 Illustrated Parts Catalog (p/n 12138-001) SR22 Illustrated Parts Catalog (p/n 13774-001) SR20 Airplane Maintenance Manual (p/n 12137-001) SR22 Airplane Maintenance Manual (p/n 13773-001) SR20 Wiring Manual (p/n 12129-001) SR22 Wiring Manual (p/n 13775-001) WEIGHT AND BALANCE N/A MATERIAL INFORMATION The following parts are required to comply with this Service Bulletin. Parts can be obtained from Cirrus Design Spare Part Sales or an authorized Cirrus Design Service Center. Order Kit p/n 70074-001. ACCOMPLISHMENT INSTRUCTIONS A. Acquire necessary tools, equipment, and supplies. B. Remove key from ignition. C. Ensure BATTERY and AVIONICS master switches are in OFF position. D. Remove glareshield. (Refer to AMM 25-10) E. Remove co-pilot’s seat. (Refer to AMM 25-10) Item No. Description P/N or Spec. Supplier Quantity 1 Service Bulletin SB 2X-34-08 R1 Cirrus Design 1 2 Ground Wire 17074-001 Cirrus Design 1 Description P/N or Spec. Supplier Purpose Cable Ties - Any Source Secure ground wire to exist- ing harnesses. Insertion Tool 9099 Positronics Enterprises, Ltd. Springfield, MO 65806 800-641-4054 Install ground wire pin end. Ohmmeter - Any Source Measure resistance between OAT probe and aircraft ground. Sandpaper 80-grit Any Source Burnish connector back- shell. SB 2X-34-08 R1 3 of 4 Revised: 06 May 2005 F. Remove RH kick plate. (Refer to AMM 25-10) G. Install ground wire. (See Figure 01) 1. Locate OAT probe installed immediately forward of the passenger’s door. (Refer to AMM 34-10) 2. Remove clamp screw from P905 connector backshell of OAT probe. 3. Attach terminal ring from ground wire to P905 connector backshell with clamp screw. 4. Bundle ground wire to existing harnesses using adel clamps and cable ties where necessary. 5. Disconnect P602 from firewall ground jack. 6. Using insertion tool, connect pinned end of ground wire to P602 plug into any available pin receptacle. 7. Reconnect P602 to firewall ground jack. H. Using Ohmmeter, verify resistance from OAT probe to aircraft ground is less than 2 Ohms. 1. Position one Ohmmeter lead to tip of OAT probe and other lead to a suitable airplane ground such as the tailpipe. 2. If resistance from OAT probe to aircraft ground is less than 2 Ohms, the OAT probe is adequately grounded and no further steps are necessary. 3. If resistance from OAT probe to aircraft ground is greater than 2 Ohms, then perform the follow- ing steps: a. Remove clamp screws securing ground wire and clamp to P905 connector backshell. b. Using 80-grit sandpaper, burnish contact surfaces of P905 connector backshell and clamp. (See Figure 01) c. Position clamp and ground wire terminal ring to P905 connector backshell and secure with clamp screws. d. Repeat resistance measurement with Ohmmeter. If necessary, repeat burnishing steps until measured resistance from OAT probe to aircraft ground is less than 2 Ohms. I. Install RH kick plate. (Refer to AMM 25-10) J. Install co-pilot’s seat. (Refer to AMM 25-10) K. Install glareshield. (Refer to AMM 25-10) L. Send completed warranty claim form to Cirrus Design Customer Service and complete airplane records by noting compliance with SB 2X-34-08 R1 in Airplane Logbook. SB 2X-34-08 R1 4 of 4 Revised: 06 May 2005 P602 19 20 P901 OAT + OAT - BLU WHT B P905 WHT BLU A + - SEOA972-22 SENSOR INTERFACE UNIT OAT