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SERVICE
BULLETIN Britten-Norman Aircraft Limited Commodore House, Mountbatten Business Centre, Millbrook Road East, Southampton, SO15 1HY United Kingdom 23/05/2018 SB 364 Issue 3 Page 1 of 7 Models Affected Service Bulletin Number All BN2T Series Britten-Norman Islander Aircraft (not including the BN2T -4S).
SB 364 Issue 3 – 23/05/2018
INSPECTION OF THE RUDDER FINAL DRIVE ROD ASSEMBLY This is a highly recommended safety related Service Bulletin.
1 COMPLIANCE STATEMENT Compliance is required within the next 200 flying hours. Refer to MS4 for inspection criteria.
The closing action to this Service Bulletin will be an update to the Aircraft Maintenance Manual MM4 Chapter
2.6. Any Rudder Final Drive Rod assembly that has evidence or record that it has previously had taper pins replaced or reworked, must be replaced within 200 flight hours of receipt of this Service Bulletin.
2 INTRODUCTION Britten-Norman Aircraft has been made aware of instances of failures of the Rudder Final Drive Rod part number NB-45-0991.These failures have been observed on the region of the taper pins. There is evidence that supports the fact that replacing the taper pins, in accordance with the Maintenance Manual, could be a significant factor contributing to the failure of this rod . This Service Bulletin introduces actions to be taken on finding loose taper pins or end connections in the rudder final drive rod during routine inspection or in the event that there is evidence or record that taper pins have been previously replaced, following the issue of this Service Bulletin.
This SB is ONLY applicable to the Rudder Final Drive Rod.
Service Bulletin
SB 364 23/05/2018 Page 2 of 7 Issue 3 3 APPLICABILITY This Service Bulletin is applicable to all BN2T Series Britten-Norman Islander aircraft not including the BN2T- 4S.
4 EFFECT ON WEIGHT AND BALANCE None.
5 EFFECT ON PUBLICATIONS The aircraft publications will be amended as necessary by normal revision action at the earliest opportunity.
6 ACTION Operators are requested to examine the Rudder Final Drive Rod assembly in accordance with M aintenance Schedule MS4 section 1 page 4 & 5 paragraph ‘C’ Control System Components.
If considered unserviceable following this inspection, defects must be remedied immediately.
Previously operators finding loose taper pins or end connections in the rudder final drive rod have been able to replace the taper pins in accordance with the Aircraft Maintenance Manual Chapter 1.6 paragraph 41. This maintenance activity will no longer be supported by Britten-Norman Aircraft and instead the operator will now be required to replace the complete rudder drive rod assembly.
In addition any Rudder Final Drive Rod assembly that has evidence or record that it has previously had taper pins replaced or reworked, must also be replaced within 100 flight hours of receipt of this Service Bulletin.
If the Rod Assembly is unserviceable the following procedure should be used to carry out replacement:
7 REMOVAL AND INSTALLATION INSTRUCTIONS FOR UNSERVICEABLE UNITS
7.1 Preparation
1. Put the rear fuselage trestle in position at STA 352.45. Increase the height of the trestle until it touches the fuselage.
2. Put warning signs in the flight compartment and adjacent to the aircraft to tel l persons ‘DO NOT OPERATE THE FLIGHT CONTROLS’.
3. Put the maintenance platform in position to get access to the Rudder final control drive rod.
4. Put the Rudder in the neutral position and install the Rudder gustlocks as required.
5. Remove the applicable access panels to gain access to the Rudder final control rod.
CAUTION: DO NOT STAND ON THE HORIZONTAL STABILISER
Service Bulletin
23/05/2018 SB 364 Issue 3 Page 3 of 7
7.2 Removal
1. Refer to Figure 1.
2. Remove and discard the split pin (1).
3. Remove and retain the slotted nut (2) and washer (3).
4. Hold the Rudder final control drive rod (11) and remove and retain the bolt (4) and the two spacers
(5). Lower the screwed end eye cleat from the Rudder drive lever.
5. Remove and discard the split pin (6).
6. Remove and retain the slotted nut (7) and washer (8).
7. Hold the Rudder final control drive rod (11) and remove and retain the bolt (10) and the two spacers (9).
8. Move the fork end from the Rudder drive lever.
9. Remove the Rudder final control drive rod (11) from the aircraft.
Inspect attaching parts retained (items 2 to 5 and 7 to 10 of figure 1); any items that are unserviceable, (show signs of damage or corrosion) must be replaced before installation.
Refer to the Illustrated Parts Catalogue to identify part numbers.
7.3 Installation
1. Refer to Figure 1
2. Align the fork end of the Rudder final control drive rod (11) with the forward Rudder drive lever.
3. Hold the Rudder final control drive rod (11) in position and install the two spacers (9) and the bolt
(10).
4. Install the washer (8) and the slotted nut (7).
5. Install a new split pin (6).
6. Align the screwed end eye of the Rudder final control drive rod (11) with the aft Rudder drive lever.
7. Hold the Rudder final control drive rod (11) in position and install the two spacers (5) and bolt (4).
8. Install the washer (3) and the slotted nut (2).
9. Install a new split pin (1).
10. Lubricate the Rudder final control drive rod/Rudder drive lever in accordance with the Aircraft maintenance Manual.
11. Remove the Rudder gustlocks as required.
12. Do a Rudder control system rigging check, refer to chapter 2.6, maintenance chart 6.
13. Install the removed access panels.
14. Remove the warning signs, ‘DO NOT OPERATE THE FLIGHT CONTROLS’, from the flight compartment and adjacent to the aircraft.
15. Remove the maintenance platform
16. Remove the trestle and profile board.
Service Bulletin STA 378.95 Figure 1 SB 364 23/05/2018 Page 4 of 7 Issue 3
Service Bulletin
23/05/2018 SB 364 Issue 3 Page 5 of 7 8 MANPOWER This procedure will take between 2 and 8 hours to complete.
9 PROVISIONING Please order Rudder Final Drive Rod Assembly NB -45-0991, available from Britten-Norman Ltd. Customer Services Department, at Britten -Norman Group Ltd. Bembridge Airport, Isle of Wight, PO35 5PR, United Kingdom.
10 FOLLOW ON ACTION At a period not exceeding 1000 flight hours from initial inspection and after every 1000 flight hours following, operators are requested to examine the Rudder Final Drive Rod assembly in accordance with Maintenance Schedule MS1 section 1 page 4 & 5 paragraph ‘C’ Control System Components.
Operators are requested to complete the operator feedback form at Appendix A and return it to Britten - Norman Customer Support.
This procedure will be entered into the Maintenance Schedule by normal revision action at the earliest opportunity.
For Customer Support e-mail - customer.support @britten-norman.com or telephone +44 (0) 203 371 4000
11 APPROVAL The technical content of this document is approved under the authority of DOA n umber EASA.21J.138.
Service Bulletin
SB 364 23/05/2018 Page 6 of 7 Issue 3 12 APPENDIX A – OPERATOR FEEDBACK
OPERATOR DETAILS Company Name
Contact Person
Contact address
Telephone Number
Email Address
AIRCRAFT DETAILS Model/Type Registration Number
Constructor Number
Total flying Hours
Total landings
Service Bulletin
23/05/2018 SB 364 Issue 3 Page 7 of 7 Please record below the details of the Rudder Final Drive Assembly currently fitted to the aircraft listed on page 6 of this appendix and list any repairs previously carried out. A separate form should be filled out for each aircraft owned by the operator.
NB-45-991 Rudder Final Drive Assembly
HOURS IN SERVICE
CYCLES IN SERVICE
TAPER PINS EYE END BEARING ASSEMBLY First repair (hours) First repair (cycles) Second repair (hours) Second repair (cycles) Third repair (hours) Third repair (cycles)
Detail in this section any other relevant information: