ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 1/7

28th July 2015

SERVICE BULLETIN N° F406-104

MANUFACTURER REFERENCE: N°F406-104 N° ATA: 27

Date: 28th July 2015

TITLE: Inspection of rudder control pedal torque tube

EFFECTIVITY

Model Serial Number

F406 0001 to 0098

PURPOSE

 A pilot rudder pedal became detached in flight. No change in aircraft attitude occurred 

and the flight continued back. Rudder was control normally by copilot rudder pedal until a 

safe landing.

This service bulletin describes the procedure for detection of potential cracks on rudder 

control pedal torque tube.

COMPLIANCE: MANDATORY

APPLICATION : 

VISUAL AND PENETRANT INSPECTION MUST BE CARRIED OUT PRIOR TO NEXT 

FLIGHT. REFER TO PART A

MAGNETIC PARTICLE INSPECTION MUST BE CARRIED OUT DURING NEXT 

SCHEDULED 100 FLIGHT HOURS MAINTENANCE CHECKS. REFER TO PART B

APPROBATION

This service bulletin has been approved under the privileges of the design organization 

approval EASA 21J.064.

This ASI Aviation service bulletin is attached to the AD EASA approval number: 2015-

0159-E.

REFERENCE

None
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 2/7

28th July 2015

MAN-HOURS

Approximately 20 man-hours.

MATERIAL

Not applicable

CREDIT

Not applicable

OVERVIEW
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 3/7

28th July 2015

ACCOMPLISHMENT INSTRUCTIONS

WARNING: 

WHENEVER MAINTENANCE IS CONDUCTED ON ANY FLIGHT 

CONTROL SYSTEM REQUIRING REMOVAL/INSTALLATION OF 

CONTROL CABLES, ENSURE CONTROL CABLES ARE NOT 

CROSSED DURING CONTROL CABLES REINSTALLATION.

PART A : VISUAL AND PENETRANT INSPECTION

Instruction VISA INSPECTION

A.1

Remove flight compartment carpet and scuff plate following 

AMM Chapter 25-22-01 page 201 to get access to rudder 

pedals.

A.2

Clean parts with alkaline solvent as per AMM-Chapter 20-30-

04.

Torque tubes shall be free from grease or other contaminates 

which could decrease contrast between a discontinuity and its 

background.

A.3

Inspect visually both torque tube for cracks in welded joint 

areas.

Carry out a penetrant inspection by a qualified personnel on 

rudder pedal torque tube (both side: pilot and copilot).
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 4/7

28th July 2015

A.4

If any defect is detected, please fill attached form and contact 

ASI Aviation customer support for further information.

If no defect is detected, apply following steps.

A.5 Clean parts with alkaline solvent as per AMM-Chapter 20-30-

04 to remove all penetrant substance.

A.6 Install flight compartment carpet and scuff plate following AMM 

Chapter 25-22-01 page 201 to get access to rudder pedals.

A.7 Perform adjustement/test of rudder control system following 

AMM Chapter 27-20-00 page 501
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 5/7

28th July 2015

PART B : MAGNETIC PARTICLE INSPECTION

Instruction VISA INSPECTION

B.1

Remove Rudder pedal assembly following AMM Chapter 27-

20-01 page 206.

B.2 Clean parts with alkaline solvent as per AMM-Chapter 20-30-

04.

Torque tubes shall be free from grease or other contaminates 

which could restrict particle movement.

B.3

Carry out a magnetic particle inspection by a qualified 

personnel on rudder pedal torque tube (both side: pilot and 

copilot).

Magnetic particle inspection can be performed using the 

fluorescent, wet continuous or direct current technique 

whichever possibilities.

Cracks can occur at welded joint between torque tube and 

pedals.

B.4

If any defect is detected, please fill attached form and contact 

ASI Aviation customer support for further information.
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 6/7

28th July 2015

If no defect is detected, apply following steps.

B.5 Demagnetize parts after final inspection.

B.6

Clean parts with alkaline solvent as per AMM-Chapter 20-30-

04 to remove all magnetic substance.

B.7

Install Rudder pedal assembly following AMM Chapter 27-20-

01 page 206.

B.8

Perform adjustement/test of rudder control system following 

AMM Chapter 27-20-00 page 501

OWNER NOTIFICATION

The Service Bulletin F406-104 dated 28th July 2015 will be addressed to the owners of 

the F406 airplanes. It is recommended to the customers to contact ASI AVIATION for any 

further information relating to the application of this Service Bulletin on your airplane.

ASI AVIATION

Aérodrome de Reims-Prunay

51360 Prunay France

Tel : (33) 3.26.48.46.65

Customer Support Website: http://asi-aviation.fr/asi-aviation-support/1.html
ASI AVIATION

51360 PRUNAY - FRANCE

Service Bulletin N° F406-104 Page 7/7

28th July 2015

INSPECTION FORM

SB-F406-104

Company : ......................................................................................................................................

Adress : ..........................................................................................................................................

.......................................................................................................................................................

.......................................................................................................................................................

Name :........................................................ Occupation : ........................................................

Email : ........................................................

Telephone : ................................................

Actual configuration:

Serial Number: F406- .................

Defect is detected on LH rudder pedal torque tube: □ Yes (Visual / Penetrant / Magnetic particle inspection)

□ No

Defect is detected on LH rudder pedal torque tube: □ Yes (Visual / Penetrant / Magnetic particle inspection)

 □ No

(Surround applied inspection)

Maintenance Phase :......................................... Date :..........................

Total flight hours : .......................

Total landings : ...........................

Commentary :.................................................................................................................................

.......................................................................................................................................................

.......................................................................................................................................................

.......................................................................................................................................................

To send at :

http://asi-aviation.fr/asi-aviation-support/1.html

Or by letter at :

ASI Aviation

Support Client

Aérodrome de Reims-Prunay

51360 Prunay, France