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Service Bulletin 30 May 2016 Revision 01, 21 October 2016 340−33−058 Page 1 of 5 ATA CHAPTER: 33 LIGHTS − PASSENGER READING LIGHT − CHANGE OF CIRCUIT BREAKER FOR PASSENGER READING LIGHT.
Mod No. 3501
1. PLANNING INFORMATION A. EFFECTIVITY
(1) Aircraft:
Aircraft Mfg. Serial No’s SAAB SF340A − 004 thru − 138.
NOTE: This Service bulletin is not applicable for aircraft with Service Bulletin SAAB 340−33−053 (Modification/Removal for Cargo/Freighter Configuration) implemented.
B. REASON Circuit breakers of an unsuitable strength, 10A instead of 7.5A, have been found installed for 2LJ and 4LJ.
In case of a small overcurrent in the system, the circuit breakers will not open.
10A is above the safe continuous current for the installed wire dimension. If overcurrent in the system occur, there is a risk for overheated wires, smell and possibly, smoke or fire.
Implementation of this Service Bulletin will make sure that correct circuit breakers are installed and thus remove the possibility for overcurrent in the wires.
C. DESCRIPTION Replacement of oversized circuit breakers 2LJ and 4LJ in the reading system.
D. COMPLIANCE Mandatory Saab recommends this Service Bulletin to be performed within 6 months from release of this Service Bulletin.
This Service Bulletin is under EASA consideration for an Airworthiness Directive.
The final compliance terms will be set by the EASA Airworthiness Directive (AD) when issued.
E. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA nr. EASA.21J.066.
F. MANPOWER Estimated time to complete this Service Bulletin is:
1 persons required.
Total manhours: 2 Elapsed time (hours):
Labour cost at operators expense.
Service Bulletin 30 May 2016 Revision 01, 21 October 2016 340−33−058 Page 2 of 5 G. MATERIAL − COST AND AVAILABILITY Price and availability for parts required to do this service bulletin will be furnished on request.
H. WEIGHT AND BALANCE Not affected.
I. ELECTRICAL LOAD DATA Not affected.
J. REFERENCES Aircraft Maintenance Manual (AMM) 24 −00−00 Maintenance practices 33−23−05−05 Adjustment / Test 39−10−42−02 Maintenance Practices Wiring Manual (WM) 20 −00−00 Standard practices K. OTHER PUBLICATIONS AFFECTED Illustrated Parts Catalog (IPC) Wiring Manual (WM)
2. ACCOMPLISHMENT INSTRUCTIONS CAUTION: BE CAREFUL WHEN YOU DO THE MODIFICATION OF THE HARNESS.
MAKE SURE THAT YOU DO NOT DAMAGE THE EXISTING WIRES WHEN NEW WIRES ARE INSTALLED. CLEAN AND INSPECT THE AFFECTED HARNESS WHEN THE MODIFICATION IS COMPLETED. DAMAGES TO THE WIRES CAN CAUSE SYSTEM MALFUNCTION.
NOTE: All wiring changes are to be performed in accordance with the procedures in the WM 20−00−00.
A. JOB SET −UP
(1) Before you start the SB, make sure:
− The modification kit contains the parts listed in the Service Bulletin − The documentation is available
(2) Make sure the aircraft is safe for maintenance before you start the modification.
(a) Isolate the electrical power (Ref. AMM 24 −00−00, maintenance practices).
(3) Open for access.
REF. FIG 1 CAUTION: BEFORE YOU LOOSEN THE CIRCUIT BREAKER PANEL, MAKE SURE THAT THE LEFT AND RIGHT BATTERY ARE REMOVED. THAT WILL HELP TO PREVENT DAMAGE TO THE EQUIPMENT AND STRUCTURE.
(a) Release the fasteners that attach the circuit breaker panel 10VU to the structure and lower the panel.
B. MODIFICATION REF. FIG. 1, 2
Service Bulletin 30 May 2016 Revision 01, 21 October 2016 340−33−058 Page 3 of 5
(1) Remove these circuit breakers (101) (Ref. AMM 39 −10−42−02, Maintenance Practices).
− 2 LJ INTERNAL LIGHTS CABIN READ L (L25) − 4 LJ INTERNAL LIGHTS CABIN READ R (L26).
(2) Install these circuit breakers (1) (Ref. AMM 39 −10−42−02, Maintenance Practices).
− 2 LJ INTERNAL LIGHTS CABIN READ L (L25) − 4 LJ INTERNAL LIGHTS CABIN READ R (L26).
(3) Install the circuit breaker panel 10VU.
C. JOB CLOSE −UP
(1) Restore the electrical power (Ref. AMM 24 −00−00, maintenance practices).
(2) Do the operational test of the reading lights in the passenger compartment (Ref. AMM 33−23−05−05).
(3) Remove all the tools and the equipment from the work area. Make sure the work area is clean.
3. MATERIAL INFORMATION A. Parts required for modification:
Item Part Number Qty Nomenclature Designation Remarks 1 MS3320 −7−5 2 Circuit Breaker 7.5A B. Removal Item Part Number Qty Nomenclature Designation Remarks 101 MS3320 −10 2 Circuit Breaker 10A Discard
Service Bulletin 30 May 2016 Revision 01, 21 October 2016 340−33−058 Page 4 of 5 A31420 CIRCUIT BREAKER PANEL 10VU (RH SIDE) Circuit Breaker − Component Location FIG. 1
Service Bulletin 30 May 2016 Revision 01, 21 October 2016 340−33−058 Page 5 of 5 Wire Diagram − LJ System A/C 004−138 FIG. 2 A34379 A34379 L/1 L/1 L/1 LJ6-22 LJ4-22 LJ8-20 LJ16-20
INTERNAL LIGHTS
CABIN READ R
INTERNAL LIGHTS
CABIN READ L
7.5A
7.5A 10A
INTERNAL LIGHTS
CABIN READ C 2LJ 4LJ 6LJ
RH CB PNL 10VU
POST MOD PART OF DWG 7233292-805 SHEET 1 OF 4 REV.
PART OF DWG 7233292-603 SHEET 1 OF 4 REV.
PART OF DWG 7233292-601 SHEET 1 OF 4 REV.
PART OF DWG 7233292-502 SHEET 1 OF 4 REV.
L/1 L/1 L/1 LJ6-22 LJ4-22 LJ8-20 LJ16-20