CIRRUS SR22T

Service Bulletin

SB 2X-71-17 R1

Page 1

EFFECTIVITY:

Number: SB 2X-71-17 R1

1. COMPLIANCE

Mandatory: Cirrus Design considers this Service Bulletin to be MANDATORY. Accomplish this Service 

Bulletin within the next 10 Flight Hours. 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 Reinforced Silicone Fiberglass Seals 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 this Service Bulletin.

This Service Bulletin has been revised to expand effectivity.

Operators who have successfully complied with the original release of this Service 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 issue date of this Service 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 - Disbonding Of Induction System Air Box Seal(s)

Issued: July 21, 2011

Revised: Sept 30, 2011
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 diameter 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 four air 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 four air 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 Fiberglass Seal to mounting flange pushing 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 to 

slightly 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

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4515 Taylor Circle

Duluth, MN 55811

SNS SUBJECT: 71-60 AIR INTAKES - Disbonding Of Induction System Air Box Seal(s)

Issued: Sept 30, 2011
Cirrus Design Corp

4515 Taylor Circle

Duluth, MN

55811-1548

STAMP

CIRRUS DESIGN CORPORATION

4515 TAYLOR CIRCLE

DULUTH, MN

55811-1548