# CIRRUS SR22T Service Bulletin



# SB 2X-71-17 R1 Page 1 EFFECTIVITY: **SB 2X-71-17 R1 Number:** 

**1. COMPLIANCE Mandatory:**  Cirrus Design considers this Service Bulleti n to be MANDATORY. Accomplish this Service Bulletin within the next 10 Flight Ho urs. Compliance time begins upon receipt of this Service Bulletin. **2. EFFECTIVITY** Group A: SR22T Serials 0001-0169, except 0154, 0159, 0163. and Group B: SR22T Serials 0004, 0019, 0027, 0047, 0097, 0126, 0127, 0135, 0138, 0139, 0144, 0155, 0157, 0158, 0160, 0161. Aircraft in Group B had the Reinforc ed Silicone Fiberglass Seal s installed at the factory, however, the air box flange welds and slots were incorrectly modified. Inspect and modify the air box flange welds and slots in accordance with th is Service Bulletin. This Service Bulletin has been revised to expand effectivity. Operators who have successfully complied with the origin al release of this Servic e Bulletin, dated July 21, 2011, need take no further action. **3. APPROVAL** FAA approval has been obtained on all technical data in this Service Bulletin that affects type design. **4. PURPOSE** A condition can occur in which the induction system air box seal(s) could become disbonded and ingested into the turbocharger compressor. **5. DESCRIPTION** This Service Bulletin provides instructions for the replacement of the air box seals. **6. WARRANTY INFORMATION** For aircraft under warranty at the i ssue date of this Servic e Bulletin, Cirrus Design will cover all parts and labor costs for this Service Bulletin if the work is accomplished within the Compliance time period and the work is performed at an authorized Cirrus Design Service Center. **7. MANPOWER REQUIREMENTS** 2.25 manhours. **8. OTHER PUBLICATIONS AFFECTED** SR22/22T Airplane Maintenance Manual (p/n 13773-001) SR22/22T Illustrated Parts Catalog (p/n 13744-001) **9. WEIGHT AND BALANCE** N/A **SNS SUBJECT:** 71-60 AIR INTAKES - Disbo nding Of Induction System Air Box Seal(s) July 21, 2011 Issued: Sept 30, 2011 Revised:

# CIRRUS S E R V I C E B U L L E T I N M O D E L S R 2 2 T



# SB 2X-71-17 R1 Page 2 EFFECTIVITY: Sept 30, 2011 **10. MATERIAL INFORMATION**The following parts are required to comply with this Service Bulletin. Parts can be obtained from an Authorized Cirrus Design Service Center or Parts Distributor. Order kit 70257-001 to obtain the following parts.

**11. ACCOMPLISHMENT INSTRUCTIONS** A. Acquire necessary tools, equipment, and supplies.

B. Remove engine cowling. (Refer to AMM 71-10) C. Remove clamp securing air box to turbocharger. D. Disconnect air box from turbocharger. E. Remove and discard black rubber seal from air box. F. Remove residual adhesive from air box. G. Using Grinding Wheel, grind weld on outside diamet er of airbox fitting flush to surrounding surface. (See Figure 1)
**CAUTION:** Do not extend slots into any weld. H. Affected Serials in Range 0001 thru 0151, LH Air Box Only; Using Cut-Off Tool, extend three of the four air box flange slots to 0.90 inch (2.29 cm) with full radius on the end. Do not extend the top slot nearest to the weld. I. Affected Serials in Range 0001 thru 0151, LH Air Box Only; Using Cut-Off Tool, increase width of all fourair box flange slots to 0.13 inch (3.30 mm). J. Affected Serials in Range 0152 thru 0169, LH Air Box Only; Using Cut-Off Tool, extend all four air box flange slots to 0.90 inch (2.29 cm) with full radius on the end. K. All Affected Serials, RH Air Box Only; Using Cut-Off Tool, increase width of all fourair box flange slots to 0.13 inch (3.30 mm). **Item No. Description**  **P/N or Spec. Supplier**  **Quantity** 1 Reinforced Silicone Fiberglass Seal 29486-001 Cirrus Design 2

**Description P/N or Spec.**  **Supplier Purpose**  Grinding Wheel NA Any Source Abrading Cut-Off Tool NA Any Source Cutting Alodine Pen N/A Any Source Corrosion Prevention Emery Cloth 120 Grit Any Source Abrading Isopropyl Alcohol NA Any Source Solvent Cleaning RTV Prime Coat PR1204 Dow Corning Adhesive Primer RTV Sealant 736 Dow Corning Adhesive

# CIRRUS S E R V I C E B U L L E T I N M O D E L S R 2 2 T



# SB 2X-71-17 R1 Page 3 EFFECTIVITY: Sept 30, 2011 L. All Affected Serials, RH Air Box Only: Using Cut-Off Tool, extend three of the four air box flange slots to 0.90 inch (2.29 cm) with full radius on the end. Do not extend the top slot nearest to the weld. M. Touch-up reworked areas with alodine pen. N. Abrade inside of Reinforced Silicone Fiberglass Seal with emery cloth and solvent clean with isopropyl alcohol. O. Abrade induction mounting flange on turbocharger with emery cloth and solvent clean with isopropyl alcohol. P. Clean air box of any residual machining debris. Q. Apply PR1204 RTV prime coat to turbocharger induction mounting flange. Cure for 2 hours. R. Apply a thin coating of 736 RTV sealant turbocharger induction mounting flange. S. Install Reinforced Silicone Fiberglas s Seal to mounting flange pushin g seal as far aft as possible. Remove excess RTV. Cure for 24 hours.
**CAUTION:** Upon installation, If airbox fit is loose, remove from turbocharger, and use clamp toslightly reduce flange diameter. Use care not to over-compress and cause fit-up problems. T. Install air box over turbocharger induction mounting flange. Torque clamp to 90-100 in-lb (10-11 Nm). U. Ensure FOD cannot enter induction system by inspecting air box flange and verifying fiberglass seal completely blocks air box slots. (See Figure 1) V. Install clamp securing air box to turbocharger. W. Repeat procedure on opposite turbocharger. X. Install engine cowling. (Refer to AMM 71-10) Y. Complete airplane records by noting compliance with SB 2X-71-17R1 in Aircraft Logbook.

# CIRRUS S E R V I C E B U L L E T I N M O D E L S R 2 2 T



# SB 2X-71-17 R1 Page 4 EFFECTIVITY: Sept 30, 2011 **Figure 1 Air Box Seal Installation**  0.90 inch (2.29 cm) DO NOT LENGTHEN UPPER LOCATION

0.90 inch (2.29 cm) 0.13 inch (3.30 mm)

LH side: Serials 22T-0001 thru 22T-0151. RH side: Serials 22T-0001 thru 22T-0169. LH side: Serials 22T-0152 thru 22T-0169.
**SLOT MODIFICATION**

AIR BOX

(REF) CLAMP (REF) SEAL (REF)

SR2_SB71_1427 TURBOCHARGER (REF)

Grind indicated weld on outside diameter of airbox fitting flush. Ensure FOD cannot enter induction system by inspecting air box flange and verifying fiberglass seal completely blocks air box slots. **NOTE** 3 PLC'S 4 PLC'S 4 PLC'S

# CIRRUS SR22T Service Bulletin

Use this form to submit a Publications Change Request to our Engineering Department and/or to tell us what you think of the quality of this public ation. We will use the data you provide us to improve the quality of our technical publications. **SB 2X-71-17 R1 Number:**  

### Service Loop Evaluation Form

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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - **Evaluation:** Please rate the quality of this publication. (good) 4 3 2 1 (poor) Please rate the quality of th e illustrations. (good) 4 3 2 1 (poor) Is this publication easy to understand? (good) 4 3 2 1 (poor) Is this publication easy to use? (good) 4 3 2 1 (poor) Are the Material and Accomplishment Instructions accurate? (good) 4 3 2 1 (poor) Is the Manpower estimate accurate? (good) 4 3 2 1 (poor) Give the completed evaluation form to your Cirrus Field Service Representative or send this form to Cirrus Design Corporation: Manager - Technical Publications 4515 Taylor Circle Duluth, MN 55811 **SNS SUBJECT:** 71-60 AIR INTAKES - Disbo nding Of Induction System Air Box Seal(s) Sept 30, 2011 Issued:

### Cirrus Design Corp 4515 Taylor Circle Duluth, MN 55811-1548 STAMP

CIRRUS DESIGN CORPORATION 4515 TAYLOR CIRCLE DULUTH, MN 55811-1548