Britten-Norman SB 334: Revision 1, text

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SERVICE B— # N Britten-Norman BULLETIN Britten-Norman Aircraft Limited Commodore House, Mountbatten Business Centre, Millbrook Road East, Southampton, SO15 1HY United Kingdom Models Affected Service Bulletin number SB 334 All Islander BN2, BN2A and BN2B (piston engine) series Islander aircraft Issue 1 - 30/08/2013 and BNA Mkill series Trislander aircraft.

INSPECTION OF ENGINE CONTROL CABLE SLIDING END ASSEMBLIES This is a highly recommended safety related Service Bulletin.

1 COMPLIANCE STATEMENT Compliance is required within 6 months of the issue of this Service Bulletin.

2 INTRODUCTION Britten-Norman Aircraft Limited has been made aware of two examples where a failure of engine control cable assemblies has caused engine control issues. Affected part numbers are: 137835, 172449-1, 17250 and 172451.

This Service Bulletin is a one-off inspection of the engine control cable sliding end assemblies to ensure appropriate general conditions (Ref: MM/1 Chap 5.3 or MM/2 Chap 5.3).

The engine control cable assemblies controlling the throttle, mixture control and propeller constant speed control unit (CSU), include a cable and a sliding end assembly. The sliding end assembly is screwed to an end-fitting which connects to the relevant control lever of the engine or CSU In both reported failure occurrences the cable sliding end assemblies were in poor condition and in both occurrences an incorrect end-fitting was installed (see Fig. 1) which may have contributed to the failure.

Fig. 1 Cable Sliding End Assembly - Failed Condition (Note the incorrect end-fitting used) 30/08/2013 SB 334 Issue 1 Page 1 of 4

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Service Bulletin 3 APPLICABILITY This Service Bulletin is applicable to all Islander BN2/BN2A, BN2B and BN2A Mkill (piston engine) series aircraft.

4 WEIGHT and BALANCE None.

5 EFFECT ON PUBLICATIONS No effect on publications.

6 ACTION The following actions are to be applied to the throttle, mixture and CSU control cable end-assemblies;

WARNING:

It is essential that only the correct B-N approved parts are used in this assembly. The use of incorrect or unapproved parts may subject the component to loads for which it was not designed, which could result in a failure of the cable sliding end assembly.

Note: Ensure that the component and surrounding assemblies are cleaned before inspection.

Carry out the redefined maintenance procedure action as follows:

1) Check that the cable end-fitting installed is the correct type (see Fig 2).

2) Check that the cable sliding end assembly shows no sign of physical damage.

3) Check that the cable sliding end assembly has no signs of cracking or distortion.

4) Check that the cadmium plating is intact with no signs of cracking or peeling (see Fig. 3).

5) Check that the sliding end assembly shows no sign of corrosion.

Check that the wire locking is intact and that there is no sign of distortion or damage to the wire locking holes.

7) Check that the threaded portion of the cable sliding end assembly is clean and undamaged.

8) Check that the control linkage is adjusted in accordance with the instructions detailed in the relevant installation instructions (MM/1 or MM/2).

9) If, after inspection, there is any doubt as to the serviceable condition of the cable sliding end assembly, the assembly must be removed and replaced with a serviceable unit.

SB 334 30/08/2013 Page 2 of 4 Issue 1

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Service Bulletin Sliding End Assembly Pt. No. 172451 or Pt. No. 172499-1 & Pt. No. 172450 (Mod NB-M-445) Ball Joint Pt. No. B103-10UNF Mixture Contro (Mod NB-M-445) Sliding End Assembly This is the only approved B-N Pt. No. 137835 or item for all engine control Pt. No. 172451 cables fitted to the IO Engine (Pre-Mod NB-M-445) Fork-End Pt. No. NB-47-509 Mixture Control or Pt No. NB-47-515 CSU (Pre-Mod NB-M-445) Fig. 2 B-N Approved Control Cable End Assemblies (Pre and Post Mod NB-M-445) Fig. 3 Cable Sliding End - As New Condition 30/08/2013 SB 334 Issue 1 Page 3 of 4

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Service Bulletin 7 MANPOWER

0.5 man/hours.

8 PROVISIONING The parts affected by this Service Bulletin are detailed as follows:

For the 260 SHP 'O' engine Part No. 137835 Throttle, mixture and CSU cable Sliding End Assembly Part No. 172451 Mixture cable Sliding Screwed End Assembly when MB-M-445 is embodied.

For the 300 SHP 'I0' engine Part No. 172449-1 Throttle cable Sliding End Assembly Part No. 172450 Mixture and CSU cable Sliding End Assemblies The necessary parts to comply with this Service Bulletin can be obtained from Customer Services Department, B-N Group Ltd, Bembridge, Isle of Wight, PO35 5PR, United Kingdom.

9 FOLLOW ON ACTION Once this Service Bulletin has been actioned, no further action is required.

10 APPROVAL Signed Date.. 30/8/13 EASA Approval Number EASA.21J.138 SB 334 30/08/2013 Page 4 of 4 Issue 1