## Britten-Norman 

# SERVICE BULLETIN

Britten - Norman Aircraft Limited Commodore House , M o untb atte n Business Centre , Millbrook Road East, South ampto n , S0151HY United Kingdom

Model s Affect ed Service Bulletin n u mber 

### SB 334 All Is land er BN2, BN 2A and BN2B (piston eng in e) se ri es Is lander aircraft Issu e 1 _ 3010812013 and BN2A Mklll series Trislander aircraft. 

## INSPECTION OF ENGINE CONTROL CABLE SLIDING END ASSEMBLIES This is a highly recommended safety rela ted Se rv ice Bu ll etin. 

### 1 COMPLIANCE STATEMENT Compliance is required within 6 mon th s of the issue of this Service Bulletin. 

### 2 INTRODUCTION Britten-Norman Aircraft Lim i ted has been made aware of two exampl es where a fa i lure of engine control cable assembl i es h as caused engine con t rol issues. Af fected part numbers are: 137835 , 172449-1, 17250 and 172451. This Service Bull eti n is a one-off inspection of the engine con trol cable sliding end assemblies to ens u re app r opriate general conditions (Ref: MM/1 Chap 5 . 3 or MMI2 Chap 5 . 3) . The engi n e control cable assemblies controlling the throttle, mixture control and propeller constant speed control unit (CSU), include a cab l e and a sl iding end assembly. The sliding end assembly is screwed to an end-fitting which connects to the re levant con tro l l ever or the eng ine or CSU . I n both reported fa i lure occurrences the cable sliding end assemblies were in poor conditio n an d in both occurrences an incorrect end-fitting was installed (see Fig . 1) which may h ave con tr ibu t ed to th e fa i lure.

Fig. 1 Cable Sliding End Assembly- Failed Condition (Note the incorrect end- fitti ng used) 30108/2013 I ssue 1 SB334 Page 1 of 4

### Service Bull et i n 

### 3 APPLI C ABILITY This Service Bulletin i s applicable t o all Islander BN2/BN2A, BN2B and BN2A Mklll (piston engine) series aircraft. 

### 4 WEIGHT a nd BALA NCE N one . 

### 5 EF FECT ON PU BLI CAT IONS No effect on publicati ons . 

### 6 AC TI O N The follo wing aclions are to be applied to the throtlle, mixtu re and CSU control cable end- assemblies; WA RNING : It is esse n tia l that only the corr ect 8 -N approved parts are used i n this assembly. The use of incorrect or u n approved parts may subject th e component to loads fo r whi c h it was no t designed, which could result in a fai l ure of the cable sliding e n d assembly. Note: Ensure t hat t h e component and surrounding assemb l ies are c l ea n e d before Inspection . Carry out the redefined maintenance procedure action as follows : 1) Check that t he cable end-fitting installed is the correct type (see Fig 2 ). 2) Check th at th e cable sliding end assembly shows no sign of physica l damag e. 3) Ch eck that th e cable sliding end assembly has no signs of cracking or d istortion . 4) 

### Check t hat th e cadmium plat i ng is in t act wi t h no signs of cracking or peeling (see Fig . 3). 5) 

### Check th at th e slid i ng end assembly shows no sign of corrosion . 6) Check th at t h e wire locking i s Intact and that th ere is no sign of distortion or damage to th e wire locking holes . 7) 

### Check that th e t hreade d port ion of the cable slid i ng end assembly is clean and u ndamaged . 8) 

### Check that the control linkage is adjusted in accordance with the inst ructions detailed in the relevant install ati on instructions (MM/1 or MM/2). 9) 

### If, after in sp ection , there i s any doubt as to th e serviceable condition of th e cable sl iding end assembly, t he assembly must be removed an d replaced with a serviceable un it.



### SB 334 Page 

### 2 of 

### 4 30 /08/20 1 3

Issue 1Sliding End Asse m bly Pt. No . 1 72451 or Pt. No . 172499-1 

### & Pt. No. 172450 (Mod NB-M -4 45 )

Ball J oint Pt. No . 8103-10UNF Mixt ure Contro ( Mo d NB -M -445 ) This is the only approved i tem for all engine control cables fitted to the 

### 10 Engine 

### Se rv i ce B u ll etin

Sliding End Assembly 8 -N Pt. No. 137835 or P l. No . 1 72451 (Pre-M o d NB-M -445)

Fork-End Pt. No . NB-47 - 509 M ixt ure Cont rol or Pt No. NB-47-515 

## csu (Pre- M o d NB -M- 445) Fig. 2 B-N Approved Control Cable End Assemblies (Pre and Post Mod NB-M -445)



### 3 0 1081201 3 I ssue 1 Fig. 3 Cable Sliding End- 

### As New Condition 

### S B 33 4 Page 3 of 4Se rv ice Bull e tin 

### 7 MANPOWER 0.5 man/hours. 

### 8 PROVI S ION I NG The parts af fected by this Service Bulletin are detaile d as follows : For th e 

### 260 S HP ' 0 ' engi n e Part No . 137835 Throttle, mixture and CSU cable Sl iding End Assembly Part No . 172451 Mixture cable Sliding Screwed End Assembly when MB-M-445 is embodied. For t he 

### 300 S HP 

### '10' engi n e Part No . 172449-1 Part N o. 1 72450 Throttle cable Sliding End Assembly Mixtu r e and CSU cable Sliding End Assemb l ies The necessary parts to comply with this Service Bull etin can be obtained from Customer Services Department , 8-N Group Ltd, Bembridge, Isle of Wight, P035 5PR, United Kingdom. 

### 9 FOLLOW ON ACTION Once this Service Bu lleti n has been actioned. n o further action is required . 

### 10 APPROVAL s;goed . . .. 

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# /.t1................. ..................................... . EASA Approval Number EASA.21J.138

S B 

### 334 Pag e 4 of 4 

### 3 0 /08/201 3

Issue 1