Rev 1 Jan. 3/12 Service Bulletin 215-A4452

Page 1 of 1 ATA Ref: 27−20

MODEL CL-215-6B11 (415)

REVISION TRANSMITTAL SHEET

FLIGHT CONTROLS

INSPECTION OF THE RUDDER UPPER TORQUE TUBE LOWER BEARING

Service Bulletin No.: 215−A4452 Date of Original Issue: Oct 28/11

Revision No.: 1 Date of Issue: Jan. 3/12

NOTES: 1. NO RETROACTIVE ACTION IS REQUIRED ON AIRCRAFT

MODIFIED TO THE PREVIOUS ISSUE OF THIS SERVICE

BULLETIN.

2. This revision supersedes the previous issue of this Service Bulletin.

3. Black bars in the left margin of this Service Bulletin and the details on

this Revision Transmittal Sheet refer to changes made since the

previous issue.

This Revision is issued to:

1. Revise accomplishing instructional steps 2.B. to clarify the type and the details of the check

required.

2. Revise the manhours required to do this Inspection in Section 2.F.

3. Revise Figures 1 and 2 to add enhanced locator views and reference information.

4. To make other miscellaneous, non−technical corrections.
Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 1 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

FLIGHT CONTROLS

INSPECTION OF THE RUDDER UPPER TORQUE TUBE LOWER BEARING

1. Planning Information

A. Compliance

This Service Bulletin is Mandatory.

The lubrication and inspection task described in this Service Bulletin must be performed before

and after every fire season, but inspection intervals must not exceed six months between the

two inspections. The first lubrication / inspection must be performed before February 1, 2012.

The additional procedures applicable to the PSP 495, 50 Hour Inspection, must be introduced

at the next scheduled 50 Hour Inspection upon receipt of this Service Bulletin.

The additional procedures applicable to the Daily Checks are valid immediately upon receipt of

this Service Bulletin.

NOTE: This Service Bulletin is applicable only to aircraft in the condition as originally

delivered by Canadair and/or Bombardier Aerospace or as subsequently modified by

Canadair and/or Bombardier Aerospace Service Bulletin(s). Prior to incorporation of

this Service Bulletin, the status of any related systems or structural modification(s)

introduced by Supplementary Type Approval (STA) or equivalent action must be

examined for compatibility with the modifications and test procedures (if applicable)

detailed in this Service Bulletin. 

B. Approval

The technical content of this Service Bulletin has been approved under the authority of the

Design Approval Organization No: DAO #93-Q-02.

C. Effectivity

CL-215-6B11 (415) turboprop aircraft Serial Nos. 2001 to 2990.

D. Reason

During a routine inspection, an operator of a Bombardier 415 aircraft reported corrosion on the

rudder upper torque tube lower bearing P/N DAT48-64A.
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 2 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

E. Description

This Service Bulletin gives the following:

− Instructions to refresh the lubrication in the bearing in order to examine the existing grease

for signs of corrosion and/or contaminants

− Adds a functional check to the existing 50 Hour Maintenance Check schedule of tasks

(reference PSP 495, 5−21−01)

− Adds a check of the rudder spring tab operation in the Daily Check or aircrew pre flight

check (reference PSP 495, 5−70−10).

F. Manpower

We estimate that it will take one technician approximately 30 minutes to complete the

lubrication and inspection instructions of this Service Bulletin.

We estimate that the functional check of the rudder spring tab as described in this Service

Bulletin will add approximately 1 hour of labor to the existing 50 Hour Maintenance Check.

We estimate that the check of the rudder spring tab operation in the Daily Check will add

approximately .2 hours of labor to the existing Daily Check.

G. Material Availability

This Service Bulletin contains no kit. All materials required are to be locally obtained.

H. Tool Availability

No special tools or equipment are necessary.

I. Weight and Balance

Not affected.

J. Electrical Load Data

Not affected.

K. References

For Bombardier Aerospace Reference only:

(Not Supplied with Kit)

Bombardier Aerospace Restriction and/or Special Instruction (RSI) C-3894, Revision A-1.
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 3 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

L. Publications Affected

PSP 495, STANDARD MAINTENANCE SPECIFICATION TIME LIMITS/MAINTENANCE

CHECKS.

M. Related Service Bulletin

SB 215−4394, INSPECTION OF THE RUDDER LOWER TORQUE TUBE UPPER BEARING.

NOTE: It is recommended to do the lubrication and inspection requirement of this service

bulletin in conjunction with SB 215−4394 as the task intervals are the same, involves

the same general work area, and uses common equipment and materials.

2. Accomplishment Instructions

NOTES: 1. For this modification, it is assumed that standard maintenance and repair practices

will be applied in accordance with applicable Product Support Publications (PSP).

2. For parts location, refer to the illustrations in this Service Bulletin.

3. If any deviation exists, contact your Amphibious Aircraft Technical Representative for

further instructions.

A. Lubrication of the Rudder Upper Torque−Tube Lower Bearing

(to be performed before and after every fire season)

(1) Apply grease to the upper torque tube lower bearing in accordance with PSP 492,

Maintenance Manual, Chapter 12-21-27, FLIGHT CONTROLS LUBRICATION −

SERVICING, Paragraph N.

(a) During the refreshing of the bearing internal lubricant, examine the expelled old

grease for evidence of contamination, wear metal, and corrosion residue.

Reject the bearing if contaminants and or indications of corrosion is detected.

Report such findings to Technical Support of Specialized and Amphibious Aircraft.

B. Additional Rudder Spring Tab Operational Check to the 50 Hour Maintenance Check

Refer to PSP 492, Aircraft Maintenance Manual, Chapter 27−21−00 CONTROL SYSTEM −

INSPECTION/CHECK, Paragraph C.

(1) Perform an operational check of the rudder spring tab as follows:

(a) Open access panels 332−1 and 332−7. Refer to PSP 492, Chapter 6.

(b) Verify the flight control system is set to MANUAL mode and that the rudder and

aileron hydraulic system pressure is depleted. PSP 492, Aircraft Maintenance

Manual, Chapter 29−00−00 HYDRAULIC POWER − MAINTENANCE PRACTICES,

Paragraph D.

CAUTION: OPERATING THE GUST LOCKS WITH THE FLIGHT CONTROL SYSTEM

IN NORMAL MODE MAY DAMAGE THE AIRCRAFT.

(c) Engage the gust locks.
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 4 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

(d) Push the right rudder pedal. Verify that the spring tab moves to the left and the

spring tab stop is contacted.

Push the left rudder pedal. Verify that the spring tab moves to the right and the

spring tab stop is contacted.

Pay particular attention to a rudder pedal load increase and ensure that the

movement is smooth and without binding.

(e) Allow the rudder pedals to return to neutral. Verify that the spring tab returns to the

neutral position (0 ±0.5).

(f) If binding in the movement of the rudder pedals is observed and/or the movement is

not smooth, determine the cause and rectify the problem in accordance with

PSP 492, Aircraft Maintenance Manual, Chapter 27−20−00, Section B, Step (40),

CONTROL SYSTEM − INSPECTION/CHECK.

(g) Close access panels 332−1 and 332−7. Refer to PSP 492, Chapter 6.

C. Addition to the Daily Maintenance Procedures

(1) Perform a check of the rudder spring tab operation as follows:

(a) Verify the flight control system is set to MANUAL mode and that the rudder and

aileron hydraulic system pressure is depleted. PSP 492, Aircraft Maintenance

Manual, Chapter 29−00−00 HYDRAULIC POWER − MAINTENANCE PRACTICES,

Paragraph D.

CAUTION: OPERATING THE GUST LOCKS WITH THE FLIGHT CONTROL SYSTEM

IN NORMAL MODE MAY DAMAGE THE AIRCRAFT.

(b) Engage the gust locks.

(c) Push the right rudder pedal. Verify that the spring tab moves to the left.

Push the left rudder pedal. Verify that the spring tab moves to the right.

Pay particular attention to a rudder pedal load increase and ensure that the

movement is smooth and without binding.

(d) Allow the rudder pedals to return to neutral.

D. Recording

When this Service Bulletin is completed, make the entry in the aircraft log book and send back

the attached Incorporation Notice to Amphibious Aircraft Technical Publications.
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 5 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

3. Material Information

This Service Bulletin contains no kit.

A. The following materials, or equivalent, are necessary to do this Service Bulletin. You can buy

them locally:

DESCRIPTION PART NO./NAME SPECIFICATION QUANTITY

Grease MIL-G-81322 A/R

Aliphatic Naphtha TT-N-95 A/R

Mystic Grease Multipurpose JT-6 A/R
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 6 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

INSPECTION OF THE UPPER TORQUE TUBE LOWER BEARING

FIGURE 1

1

1

LUBRICATING

FITTING

UPPER TORQUE

TUBE ASSEMBLY

(REF)

BEARING

FLANGE

BEARING

HOUSING

UPPER

TORQUE TUBE

(REF)

LOWER

TORQUE TUBE

(REF)

BEARING

HOUSING

LUBRICATING

FITTING

BEARING

DAT48−64A

NOTES

1

2

Check the old grease expelled out.

Boots and clamps not shown for clarity.
MODEL CL-215-6B11 (415)

ALERT

SERVICE BULLETIN

Bombardier 415

Rev NC Oct. 28/11 Service Bulletin 215-A4452

Page 7 of 7 ATA Ref: 27-20

Rev 1 Jan. 3/12

INSPECTION OF RUDDER SPRING TAB

FIGURE 2

SPRING TAB STOPS

(REF)

RUDDER

(REF)

RUDDER STOPS

(REF)
Upon completion of Service Bulletin(s), please fill in and return by fax to:

Service Bulletin Number(s) Rev.

Aircraft Serial No.

Date of Incorporation

Aircraft Reg. No.

Technical Publication,

Dept. 649-DBF−(9)

Bombardier Aerospace

Specialized &

Amphibious Aircraft

St. Laurent, Quebec

Fax No.: (514) 855−7602

Airframe Hours

Remarks

Name

SERVICE BULLETIN

INCORPORATION NOTICE

REPLY FAX

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